DOCSLIB.ORG

Seismic Design Provisions of BNBC-2020: Part 2

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Seismic Design Provisions of BNBC-2020: Part 2 S. K. Ghosh Associates LLC International Code Council (ICC) Seismic Design Provisions of BNBC-2020: Part 2 Date: 26 May 2021 Dr. S. K. Ghosh President, S. K. Ghosh Associates LLC URP S-09 Training Module S5 PART 5 EQUIVALENT LATERAL FORCE PROCEDURE www.skghoshassociates.com 1 S. K. Ghosh Associates LLC International Code Council (ICC) ASCE 7-05 12.8.6, 2.5.7.7 Story Drift Determination (') Lateral displacement of one level relative to the next level above or below x Analysis of Structures under Code- Prescribed Seismic Forces G QE xe V www.skghoshassociates.com 2 S. K. Ghosh Associates LLC International Code Council (ICC) ASCE 7-05 12.8.6, 2.5.7.7 Story Drift Determination (') 'x = Gx - Gx-1 'a where…. Gx = Cd Gxe / I ASCE 7-05 12.8.6, 2.5.7.7 Story Drift Determination (') Cd = displacement amplification factor (ASCE 7-05 Table 12.2-1, Table 6.2.19) Gxe = elastic analysis displacement 'a = allowable story drift (ASCE 7-05 Table 12.12-1, Table 6.2.21, Section 2.5.14) I = seismic importance factor (ASCE 7-05 Table 1.5-2, Table 6.2.17) www.skghoshassociates.com 3 S. K. Ghosh Associates LLC International Code Council (ICC) Allowable Story Drift ('a ) ASCE 7-05 Table 12.12-1, Table 6.2.21 Occupancy Category Building I or II III IV Buildings 4 stories in height; other than masonry; 0.025h 0.020h 0.015h Non-structural elements designed to sx sx sx accommodate story drift Masonry cantilever shear wall 0.010h 0.010h 0.010h buildings sx sx sx Other masonry shear walls buildings 0.007hsx 0.007hsx 0.007hsx All other buildings 0.020hsx 0.015hsx 0.010hsx ݔ = Story height below levelݏ 2.5.14.1 Story Drift Limit For seismic force–resisting systems comprised solely of moment frames in Seismic Design Categories D, the allowable storey drift for such linear elastic analysis procedures shall not exceed ǻ / where is termed as a structural redundancy factor. The value of redundancy factor may be considered as 1.0 with exception of structures of very low level of redundancy where may be considered as 1.3. For nonlinear time history analysis (NTHA), the storey drift obtained (Sec 2.5.11) shall not exceed 1.25 times the storey drift limit specified above for linear elastic analysis procedures. www.skghoshassociates.com 4 S. K. Ghosh Associates LLC International Code Council (ICC) 2.5.14.3 Separation between adjacent structures Buildings shall be protected from earthquake-induced pounding from adjacent structures or between structurally independent units of the same building maintaining safe distance between such structures as follows: (i) for buildings, or structurally independent units, that do not belong to the same property, the distance from the property line to the potential points of impact shall not be less than the computed maximum horizontal displacement (Sec 2.5.7.7) of the building at the corresponding level. (ii) for buildings, or structurally independent units, belonging to the same property, if the distance between them is not less than the square root of the sum- of the squares (SRSS) of the computed maximum horizontal displacements (Sec 2.5.7.7) of the two buildings or units at the corresponding level. (iii) if the floor elevations of the building or independent unit under design are the same as those of the adjacent building or unit, the above referred minimum distance may be reduced by a factor of 0.7 2.5.14.4 Special Deformation Requirement for Seismic Design Category D [Deformation Compatibility] For structures assigned to SDC D, every structural component not included in the seismic force–resisting system in the direction under consideration shall be designed to be adequate for the gravity load effects and the seismic forces resulting from displacement to the design story drift (ǻ) as determined in accordance with Sec 2.5.7.7. Even where elements of the structure are not intended to resist seismic forces, their protection may be important. Where determining the moments and shears induced in components that are not included in the seismic force– resisting system in the direction under consideration, the stiffening effects of adjoining rigid structural and nonstructural elements shall be considered and a rational value of member and restraint stiffness shall be used. www.skghoshassociates.com 5 S. K. Ghosh Associates LLC International Code Council (ICC) 2.5.14.3 Separation between adjacent structures PART 6 EARTHQUAKE LOAD EFFECTS AND LOAD COMBINATIONS www.skghoshassociates.com 6 S. K. Ghosh Associates LLC International Code Council (ICC) 2.7.3 Strength Design Load Combinations 1. 1.4(D + F) 2. 1.2(D + F + T) + 1.6(L + H) + 0.5(Lr or R) 3. 1.2D + 1.6(Lr or R) + (L or 0.8W) 4. 1.2D + 1.6W + L + 0.5(Lr or R) 5. 1.2D + 1.0E + 1.0L 6. 0.9D + 1.6W + 1.6H 7. 0.9D + 1.0E + 1.6H 2.7.3 Strength Design Load Combinations (without F, H, T) 1. 1.4D 2. 1.2D + 1.6L + 0.5(Lr or R) 3. 1.2D + 1.6(Lr or R) + (L or 0.8W) 4. 1.2D + 1.6W + L + 0.5(Lr or R) 5. 1.2D + 1.0E + 1.0L 6. 0.9D + 1.6W 7. 0.9D + 1.0E www.skghoshassociates.com 7 S. K. Ghosh Associates LLC International Code Council (ICC) Seismic Strength Design Load Combinations 1.2D + 1.0E + 1.0L 0.9D + 1.0E E = UQE + 0.2SDSD ASCE 7-05 12.4.2 E = UQE -0.2SDSD ASCE 7-05 12.4.2 U = 1 in Seismic Design Category (SDC) A, B, and C U = 1 or 1.3 in SDC D, E, and F 2.5.13 Earthquake Load Effects and Load Combinations In BNBC-2020 U = 1 (not mentioned at all) = (6.2.56) = = = www.skghoshassociates.com 8 S. K. Ghosh Associates LLC International Code Council (ICC) Effect of Vertical Earthquake Ground Motion Gravity and Earthquake Effects Additive = = = Dhaka, Zone-2, Soil Type SD: = 0.45 = The load factor on live load L in combinations (3), (4), and (5) is permitted to be reduced to 0.5 for all occupancies in which minimum specified uniformly distributed live load is less than or equal to 5.0 kN/m2, with the exception of garages or areas occupied as places of public assembly. Effect of Vertical Earthquake Ground Motion Gravity and Earthquake Effects Counteractive = = = Dhaka, Zone-2, Soil Type SD: = 0.45 = www.skghoshassociates.com 9 S. K. Ghosh Associates LLC International Code Council (ICC) Load Combinations with Overstrength Factor Cantilever Column Systems ASCE 7-05 12.2.5.2 SDC B-F Foundation and other elements used to provide overturning resistance at the base of cantilever column elements shall have the strength to resist the load combinations with over strength factor of Section 12.4.3.2. Load Combinations with Overstrength Factor Elements Supporting ASCE 7-05 12.3.3.3 Discontinuous Walls or Frames SDC B-F SHEAR WALL Elements supporting discontinuous walls or frames www.skghoshassociates.com 10 S. K. Ghosh Associates LLC International Code Council (ICC) Load Combinations with Overstrength Factor Load Combinations with Overstrength Factor www.skghoshassociates.com 11 S. K. Ghosh Associates LLC International Code Council (ICC) Load Combinations with Overstrength Factor Collector Elements ASCE 7-05 12.10.2.1 (SDC C-F) Load Combinations with Overstrength Factor www.skghoshassociates.com 12 S. K. Ghosh Associates LLC International Code Council (ICC) 2.5.13.4 Load Combinations with Overstrength Factor Basic Combinations for Strength Design with Overstrength Factor (1.2 + 0.2SDS)D + :0QE + L (0.9 í 0.2SDS)D + :0QE 2.5.5.6 Provisions for Using System Overstrength Factor, ȍo 2.5.5.6.1 Combinations of Elements Supporting Discontinuous Walls or Frames. Columns, beams, trusses, or slabs supporting discontinuous walls or frames of structures having horizontal irregularity Type IV of Table 6.1.5 or vertical irregularity Type IV of Table 6.1.4 shall have the design strength to resist the maximum axial force that can develop in accordance with the load combinations with overstrength factor of Section 2.5.13.4. The connections of such discontinuous elements to the supporting members shall be adequate to transmit the forces for which the discontinuous elements were required to be designed. www.skghoshassociates.com 13 S. K. Ghosh Associates LLC International Code Council (ICC) 2.5.5.6 Provisions for Using System Overstrength Factor, ȍo 2.5.5.6.2 Increase in Forces Due to Irregularities for Seismic Design Categories D through E. For structures assigned to Seismic Design Category D or E and having a horizontal structural irregularity of Type I.a, I.b, II, III, or IV in Table 6.1.5 or a vertical structural irregularity of Type IV in Table 6.1.4, the design forces determined from Section 2.5.7 shall be increased 25 percent for connections of diaphragms to vertical elements 6-104 Vol. 2 and to collectors and for connections of collectors to the vertical elements. Collectors and their connections also shall be designed for these increased forces unless they are designed for the load combinations with overstrength factor of Section 2.5.5.4, in accordance with Section 2.5.13.4. 2.5.5.6 Provisions for Using System Overstrength Factor, ȍo 2.5.5.6.3 Collector Elements Requiring Load Combinations with Overstrength Factor for Seismic Design Categories C through E. In structures assigned to Seismic Design Category C, D or E, collector elements, splices, and their connections to resisting elements shall resist the load combinations with overstrength of Section 2.5.13.4.
Load more

Recommended publications
  • 98 of 127 DOCUMENTS Administrative Code of the City Of
    Page 459 98 of 127 DOCUMENTS Administrative Code of the City of New York Copyright 2010 New York Legal Publishing Corporation a New York corporation, All Rights Reserved ***** Current through December 2009 **** NYC Administrative Code SECTION BC 909 Administrative Code of the City of New York Title 28 New York City Construction Codes CHAPTER 7 THE NEW YORK CITY BUILDING CODE*1 CHAPTER 9 FIRE PROTECTION SYSTEMS SECTION BC 909 SMOKE CONTROL SYSTEMS 909.1 Scope and purpose. This section applies to mechanical or passive smoke control systems when they are required by other provisions of this code. The purpose of this section is to establish minimum requirements for the design, installation and acceptance testing of smoke control systems that are intended to provide a tenable environment for the evacuation or relocation of occupants. These provisions are not intended for the preservation of contents, the timely restoration of operations or for assistance in fire suppression. Smoke control systems regulated by this section serve a different purpose than the smoke- and heat-venting provisions found in Section 910. Mechanical smoke control systems shall not be considered exhaust systems under Chapter 5 of the New York City Mechanical Code. 909.1.1 Definitions. These definitions are added for the purposes of Section 909 only. POST-FIRE SMOKE PURGE SYSTEM. A mechanical or natural ventilation system intended to move smoke from the smoke zone to the exterior of the building. PRESSURIZATION. Creation and maintenance of pressure levels in zones of a building, including elevator Page 460 shafts and stairwells, that are higher than the pressure level at the smoke source, such pressure levels being produced by positive pressures of a supply of uncontaminated air; by exhausting air and smoke at the smoke source; or by a combination of these methods.
    [Show full text]
  • Seismic Fragility Assessment of Lng Pipe Rack Accounting for Soil-Structure Interaction
    Luigi Di Sarno and George Karagiannakis COMPDYN 2019 7th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Crete, Greece, 24–26 June 2019 SEISMIC FRAGILITY ASSESSMENT OF LNG PIPE RACK ACCOUNTING FOR SOIL-STRUCTURE INTERACTION Luigi Di Sarno1,2,*, George Karagiannakis1 1 University of Sannio Piazza Roma, 21, 82100 Benevento, Italy [email protected] [email protected] 2 University of Liverpool, Liverpool L69 3BX, UK [email protected] Abstract The increasing momentum for Natural Gas exploitation in Europe and worldwide constitutes Liquified Gas terminals indispensable links of energy supply network. Infrastructures of this kind should be resilient against the earthquake hazard and thus designed accounting for as much as possible sources of uncertainty such as modelling issues, analysis methods, seismic input selection, soil effects and others. To date, research efforts have not assessed the response of pipe racks sufficiently, let alone the interaction between the rack and piping system and analysis methods of the past have proved to be neither adequate nor efficient towards evaluat- ing the earthquake hazard potentiality. Further, soil-structure-interaction has not been incor- porated into a fragility analysis framework; albeit it is considered as a critical parameter since midstream and downstream facilities are usually rested on alluvial deposits. In the present work, a supporting RC rack is analysed through a 3D finite element model in the nonlinear regime both as coupled and decoupled vis-à-vis a piping system. The fragility func- tions are evaluated for structural components and limit states in the global and meso-scale, through the Incremental Dynamic Analysis (IDA) considering far-field conditions.
    [Show full text]
  • Nonbuilding Structures
    NONBUILDING STRUCTURES Instructional Material Complementing FEMA 451, Design Examples Non-Building Systems 15-8 1 This unit is only a brief introduction to the subject of earthquake resistant design of nonbuilding structures. It has been developed by Jim Harris from two primary sources: the content of the NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures and two slide collections of the Earthquake Engineering Research Institute: the “Annotated Slide Collection” and the “EERI Northridge Earthquake of January 1994 Collection.” The images here are all taken from the 1994 Northridge event: failed transformers in an electric power distribution substation (Sylmar), fire and flood from breaks in buried gas and water mains (Balboa Blvd, Granada Hills), and demolition of damaged highway interchange structures (Gavin Canyon undercrossing, Interstate 5). Advanced Earthquake Topic 15 - 8 Slide 1 Nonbuilding Structures Same: Different: • Basic ground •Structural motion hazards characteristics • Basic structural • Fault rupture dynamics • Fluid dynamics • Performance objectives • Networked systems Instructional Material Complementing FEMA 451, Design Examples Non-Building Systems 15-8 2 There are many issues with nonbuilding structures that are not considered in earthquake engineering for buildings Advanced Earthquake Topic 15 - 8 Slide 2 Dams with Damage Instructional Material Complementing FEMA 451, Design Examples Non-Building Systems 15-8 3 Left: San Fernando EQ (1971); partial failure of upstream face
    [Show full text]
  • Construction, Industrial Nonbuilding Structure Construction
    Industrial Nonbuilding Structure Construction 1997 Issued January 2000 EC97C-2349C 1997 Economic Census Construction Industry Series U.S. Department of Commerce Economics and Statistics Administration U.S. CENSUS BUREAU ACKNOWLEDGMENTS Many persons participated in the various The Economic Product Team, with primary activities of the 1997 Economic Census for contributions from Christina Arledge, the Construction sector. The Economic Andrew W. Hait, Barbara L. Lambert, Census Staff of the Economic Planning and and Jennifer E. Lins, was responsible for Coordination Division did the overall plan- the development of the product creation ning and review of the census operations. system to support the 1997 Economic Census product dissemination. Manufacturing and Construction Division prepared this report. Judy M. Dodds, The Geography Division staff developed Assistant Chief for Census and Related geographic coding procedures and associ- Programs, was responsible for the overall ated computer programs. planning, management, and coordination. The Economic Statistical Methods and Pro- Patricia L. Horning, Chief, Construction gramming Division, Charles P. Pautler and Minerals Branch, assisted by Susan L. Jr., Chief, developed and coordinated the Hostetter, Section Chief, performed the computer processing systems. Martin S. planning and implementation. Carla M. Harahush, Assistant Chief for Quinquen- Bailey, Michael A. Blake, Tamara A. nial Programs, was responsible for design Cole, Nina S. Heggs, Donald G. and implementation of the computer Powers, Linda M. Taylor, and Robert A. systems. Samuel Rozenel, Chief, Current Wright provided primary staff assistance. Construction Branch, Kevin J. Brian Greenberg, Assistant Chief for Montgomery and Leonard S. Research and Methodology Programs, Sammarco, Section Chiefs, supervised the assisted by Stacey Cole, Chief of Manu- preparation of the computer programs.
    [Show full text]
  • IAC Ch 23, P.1 871—23.82(96) Definition of Construction Employer
    IAC Ch 23, p.1 871—23.82(96) Definition of construction employer. 23.82(1) Construction. The department will utilize the North America Industry Classification System manual (2002 edition) to determine which employers will be classified as construction. The manual may be purchased through Bernan Press, 4611F Assembly Drive, Landham, MD 20706-4391, and is available on the Internet at http://www.ntis.gov/naics. a. The construction sector is comprised of establishments primarily engaged in the construction of buildings and other structures, heavy construction (except buildings), additions, alterations, reconstruction, installation, and maintenance and repairs. Establishments engaged in demolition or wrecking of buildings and other structures, clearing of building sites, and sale of materials from demolished structures are also included. This sector also includes those establishments engaged in blasting, test drilling, landfill, leveling, earthmoving, excavating, land drainage, and other land preparation. The industries within this sector have been defined on the basis of their unique production processes. As with all industries, the production processes are distinguished by their use of specialized human resources and specialized physical capital. Construction activities are generally administered or managed at a relatively fixed place of business, but the actual construction work is performed at one or more different project sites. Employers that provide workers primarily for construction will be classified as construction employers. b. This sector is divided into three subsectors of construction activities: (1) building construction and land subdivision and land development; (2) heavy construction (except buildings), such as highways, power plants, and pipelines; and (3) construction activity by special trade contractors. c.
    [Show full text]
  • FMI's Construction Outlook
    2016 FMI’s Construction Outlook Third Quarter Report Table of Contents Third Quarter 2016 Construction Outlook Construction Forecast ..............................................................................................1 Residential Construction ...........................................................................................3 FMI Nonresidential Construction Forecast ....................................................................6 Lodging ..........................................................................................................6 Office ............................................................................................................. 7 Commercial .....................................................................................................8 Health Care .....................................................................................................9 Education ........................................................................................................10 Religious .........................................................................................................11 Public Safety ....................................................................................................12 Amusement and Recreation .................................................................................13 Transportation ..................................................................................................14 Communication .................................................................................................15
    [Show full text]
  • FEMA 177-Estimating Losses from Future Earthquakes (Panel Report
    FEDERAL EMERGENCY MANAGEMENT AGENCY FEMA-177/ JUNE 1989 Estimating Losses From Future Earthquakes (Panel Report and Technical Background) A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A • A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A EARTHQUAKE HAZARDS REDUCTION SERIES 51 Issued by FEMA in furtherance of the Decade for Natural Disaster Reduction. FEDERALEMERGENCYMANAGEMENTAGENCY Estimating Losses From Future Earthquakes (Panel Report and Technical Background) Panel on Earthquake Loss Estimation Methodology Committee on Earthquake Engineering Commission on Engineering and Technical Systems National Research Council NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.
    [Show full text]
  • Revision Record for the State of California Errata
    REVISION RECORD FOR THE STATE OF CALIFORNIA ERRATA January 1, 2020 2019 Title 24, Part 2, Vol. 2, California Building Code General Information: 1. The date of this erratum is for identification purposes only. See the History Note Appendix on the back side or accompanying page. 2. This erratum is issued by the California Building Standards Commission in order to correct nonsubstantive printing errors or omissions in California Code of Regulations, Title 24, Part 2, of the 2019 California Building Code. Instructions are provided below. 3. Health and Safety Code Section 18938.5 establishes that only building standards in effect at the time of the application for a building permit may be applied to the project plans and construction. This rule applies to both adoptions of building standards for Title 24 by the California Building Standards Commission, and local adoptions and ordinances imposing building standards. An erratum to Title 24 is a nonregulatory correction because of a printing error or omission that does not differ substantively from the official adoption by the California Building Standards Commission. Accordingly, the corrected code text provided by this erratum may be applied on and after the stated effective date. 4. You may wish to retain the superseded material with this revision record so that the prior wording of any section can be easily ascertained. Title 24, Part 2, Vol. 2 Remove Existing Pages Insert Buff-Colored Pages 5 and 6 5 and 6 19 through 24 19 through 24 59 through 62 59 through 62 71 and 72 71 and 72 77 through 80 77 through 80 87 through 90 87 through 90 93 through 98 93 through 98 109 and 110 109 and 110 125 through 128 125 through 128 131 and 132 131 and 132 135 and 136 135 and 136 167 through 170 167 through 170 201 and 202 201 and 202 219 and 220 219 and 220 223 and 224 223 and 224 233 and 234 233 and 234 241 and 242 241 and 242 271 and 272 271 and 272 281 through 288 281 through 288 Item No.
    [Show full text]
  • On the Seismic Fragility of Pipe Rack—Piping Systems Considering Soil–Structure Interaction
    Bulletin of Earthquake Engineering https://doi.org/10.1007/s10518-020-00797-0 ORIGINAL RESEARCH On the seismic fragility of pipe rack—piping systems considering soil–structure interaction Luigi Di Sarno1,2 · George Karagiannakis1 Received: 24 May 2019 / Accepted: 29 January 2020 © The Author(s) 2020 Abstract Piping systems constitute the most vulnerable component in down- and mid-stream facili- ties posing immediate threat to human lives, communities fnancial robustness and environ- ment. Pipe racks present several mechanical and geometrical idiosyncrasies compared to common buildings and the seismic response is governed by the pipework layout. Important design requirements e.g. dynamic interaction between pipelines and supporting structure are commonly overlooked during pipe racks design process and uncertainties relevant to modelling of soil or seismic input are not quantifed. In the present work, after review- ing the technical literature and codes, a 3D RC rack was used as a testbed and analysed as coupled and decoupled with a non-seismic code conforming piping system accounting for soil–structure interaction. Incremental dynamic analysis was adopted as an assessment methodology for deriving fragility curves considering ground motions in near- and far-feld conditions. It was deduced that the modelling (boundary conditions of pipes) was the most considerable uncertainty since it increased the probability of collapse limit state of struc- tural members from 0 to 59%. It was also demonstrated that soil deformability as well as source conditions altered considerably the dispersion of intensity measure conditional on engineering demand parameter of structural and nonstructural members. The results may be another indication that code provisions should be more normative regarding industrial pipe racks.
    [Show full text]
  • Guide to Understanding IBC Seismic for MEP
    KINETICS™ Guide to Understanding IBC Seismic for MEP TABLE OF CONTENTS Section Title D2.1 – 1.0 Introduction D2.1 – 2.0 Required Basic Project Information D2.1 – 2.1 Introduction D2.1 – 2.2 Building Use – Nature of Occupancy D2.1 – 2.3 Site Class D2.1 – 2.4 Mapped Acceleration Parameters D2.1 – 2.5 Seismic Design Category D2.1 – 2.6 Summary D2.1 – 3.0 Component Importance Factor D2.1 – 3.1 Introduction D2.1 – 3.2 Criteria for Assigning a Component Importance Factor D2.1 – 3.3 Summary D2.1 – 4.0 General Exemptions and Requirements D2.1 – 4.1 Introduction D2.1 – 4.2 Exemptions for Seismic Design Categories A and B D2.1 – 4.3 Exemptions for Seismic Design Category C D2.1 – 4.4 Exemptions for Seismic Design Categories D, E, and F D2.1 – 4.5 “Chandelier” Exemption D2.1 – 4.6 Component Size Relative to the Building Structure D2.1 – 4.7 Reference Documents D2.1 – 4.8 Allowable Stress Design D2.1 – 4.9 Submittals and Construction Documents D2.1 – 4.10 Equipment Certification for Essential Facilities D2.1 – 4.11 Consequential or Collateral Damage D2.1 – 4.12 Flexibility of Components and Their Supports and Restraints D2.1 – 4.13 Summary TABLE OF CONTENTS PAGE 1 of 3 D2.1 – 0.0 Toll Free (USA Only): 800-959-1229 RELEASED ON: 05/29/2008 International: 614-889-0480 FAX 614-889-0540 World Wide Web: www.kineticsnoise.com E-mail: [email protected] Dublin, Ohio, USA Ã Mississauga, Ontario, Canada Member KINETICS™ Guide to Understanding IBC Seismic for MEP Section Title D2.1 – 5.0 Exemptions for Piping Systems D2.1 – 5.1 Introduction D2.1 – 5.2
    [Show full text]
  • Is It a Nonstructural Component Or a Nonbuilding Structure? by Robert Bachman, S.E., and Susan Dowty, S.E
    Is It a Nonstructural Component or a Nonbuilding Structure? By Robert Bachman, S.E., and Susan Dowty, S.E. This article provides guidance to code users on how to determine whether or not an item should be treated as a nonstructural component or a nonbuilding structure for purposes of seismic design. In order to explain the differences ® between nonstructural components and nonbuilding struc- tures, many generalizations need to be made so that the discussion can be simplified as much as possible. Common sense also needs to be exercised, as these generalizations don’t always apply. Also, it should be noted, that the guid- ance provided herein represents only the collective opinion of the authors at this point in time. It is hoped that as the nonstructural component and nonbuilding structure code Figure 1: Nonbuilding Structure Similar to Building. provisions evolve, some of these guidelines will become ob- solete as the code will directly address theseCopyright issues. Nonstructural Components Traditionally, nonstructural components system similar to build- have been identified as architectural, me- ings and the other type chanical and electrical components found has a structural system in buildings. Prior to adoption of the that is not similar to International Building Code (IBC), the buildings (Figures 1 and focus had been on the design of anchor- 2). The focus of this age and bracing of these components article is on nonbuild- and not the components themselves. The ing structures which are Figure 2: Nonbuilding Structure Not Similar to Building. components themselves had been treated not similar to build- as a “black box” and whatever was inside ings, and the determination of when “big” now need to be described in a more the “black box” was not required to be the design rules of ASCE 7-05 Chapter definitive way.
    [Show full text]
  • Seismic Design of Utility-Scale Wind Farm Towers in the Americas: a Comparison of Us, Mexican, and Chilean Code Requirements
    16th World Conference on Earthquake Engineering, 16WCEE 2017 Santiago Chile, January 9th to 13th 2017 Paper N° 3989 Registration Code: S-601032804 SEISMIC DESIGN OF UTILITY-SCALE WIND FARM TOWERS IN THE AMERICAS: A COMPARISON OF US, MEXICAN, AND CHILEAN CODE REQUIREMENTS N. Agbayani(1), T. Taylor(2), and E. Cruz(3) (1) P.E., S.E., Principal Engineer, Agbayani Structural Engineering – Bakersfield, California, USA, [email protected] (2) P.E., Specialist - Structures, Vestas Wind Systems A/S – Portland, Oregon, USA, [email protected] (3) Ph.D., Senior Seismic Specialist, EQCO Earthquake Engineering Consultants – Santiago, Chile, [email protected] Abstract With its beginnings in Europe, the commercial utility-scale wind industry has been evolving in North America for approximately thirty years, yet only recently have there been attempts to reconcile building code requirements with industry practices for the seismic design of the wind turbine support structures, the most predominant of which is the modern fabricated tubular tower. One such attempt was a joint effort of the American Society of Civil Engineers (ASCE) and the American Wind Energy Association (AWEA) that resulted in the publication in 2011 of a tower design guideline titled “Recommended Practice for Compliance of Large Land-based Wind Turbine Support Structures,” also known as “ASCE/AWEA RP2011.” Although perhaps just a first step, RP2011 represented a milestone in the level of design maturity for wind towers and in the level of coordination with the US building code, i.e., the International Building Code (IBC) and ASCE 7. Now in recent years, utility-scale wind project development has expanded and continues to gain momentum in Central and South America.
    [Show full text]