TJI 110, 210, 230, 360, & 560 Joists Specifier's Guide
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Truss Deflection
Truss Deflection Truss deflection may be something you do not give much thought to when designing trusses. Unfortunately, meeting the code permitted deflection ratio does not always guarantee satisfactory performance. Regardless of what the codes say, most people regard large levels of deflection as a sign of structural deficiency. Paying attention to deflection may be the key to whether your customer is satisfied with you as a supplier and continues to buy your products. Deflection of a truss is generally based on the amount of vertical movement from its original position due to the loads applied to the members. The amount of deflection depends on the span and stiffness of the members, and the magnitude of the loads applied. Codes provide the maximum allowable deflection limits for floor and roof trusses, which is based solely on the truss span. Generally, for roof trusses, the deflection in inches due to live load cannot exceed the span in inches divided by 240 (L/240) and due to total load L/180. For floor trusses, the deflection in inches due to live load cannot exceed the span in inches divided by 360 (L/360) and due to total load L/240. To meet code deflection criteria, a 40-foot span roof truss could have live load deflection 2 inches, which does not ensure satisfactory performance. MiTek engineers recommend using the deflection limits listed below. Page 1 of 5 10 /12 /20 20 Truss Deflection Roof Trusses should use the following settings: In MiTek 20/20 Engineering go to Setup – Job – Design Info – Deflection: In Structure with Truss Design go to File – Setup – Job Properties - Job Settings – Design – Building Code Settings: Please note the settings for cantilever and overhang are half that of the main span. -
Truss Terminology
TRUSS TERMINOLOGY BEARING WIDTH The width dimension of the member OVERHANG The extension of the top chord beyond the providing support for the truss (usually 3 1/2” or 5 1/2”). heel joint. Bearing must occur at a truss joint location. PANEL The chord segment between two adjacent joints. CANTILEVER That structural portion of a truss which extends PANEL POINT The point of intersection of a chord with the beyond the support. The cantilever dimension is measured web or webs. from the outside face of the support to the heel joint. Note that the cantilever is different from the overhang. PEAK Highest point on a truss where the sloped top chords meet. CAMBER An upward vertical displacement built into a truss bottom chord to compensate for defl ection due to dead load. PLATE Either horizontal 2x member at the top of a stud wall offering bearing for trusses or a shortened form of connector CHORDS The outer members of a truss that defi ne the plate, depending on usage of the word. envelope or shape. PLUMB CUT Top chord cut to provide for vertical (plumb) TOP CHORD An inclined or horizontal member that establishes installation of fascia. the upper edge of a truss. This member is subjected to compressive and bending stresses. SCARF CUT For pitched trusses only – the sloping cut of upper portion of the bottom chord at the heel joint. BOTTOM CHORD The horizontal (and inclined, ie. scissor trusses) member defi ning the lower edge of a truss, carrying SLOPE (PITCH) The units of horizontal run, in one unit of ceiling loads where applicable. -
Sealing Air Leaks and Adding Attic Insulation
For more information United States Office of Air and Radiation www.energystar.gov. Environmental (6202A) EPA 430-F-04-024 Protection Agency July 2016 Recycled/Recyclable – Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 50% Post-consumer Content) A DO-IT-YOURSELF GUIDE TO SEALING AND INSULATING WITH ENERGY STAR® SEALING AIR LEAKS AND ADDING ATTIC INSULATION CONTENTS Locating Air Leaks 1.2 Getting Started 1.4 Sealing Attic Air Leaks 1.6 Additional Sources of Air Leaks 2.1 Sealing Basement Air Leaks 3.1 Adding Attic Insulation 4.1 Sealing and Insulating your home is When you see products or services with ® one of the most cost-effective ways the ENERGY STAR label, you know they to make a home more comfortable meet strict energy efficiency guidelines and energy efficient—and you can set by the U.S. Environmental Protection do it yourself. Agency (EPA) and the U.S. Department of Energy (DOE). Since using less energy Use This Guide To: reduces greenhouse gas emissions and improves air quality, choosing ENERGY 1. Learn how to find and seal hidden STAR is one way you can do your part to attic and basement air leaks protect our planet for future generations. 2. Determine if your attic insulation is adequate, and learn how to For more information visit: add more www.energystar.gov. 3. Make sure your improvements The U.S. EPA wishes to thank The Family are done safely Handyman Magazine for their contribution 4. Reduce energy bills and help of photographs and content for this guide. -
LP Solidstart LVL Technical Guide
U.S. Technical Guide L P S o l i d S t a r t LV L Technical Guide 2900Fb-2.0E Please verify availability with the LP SolidStart Engineered Wood Products distributor in your area prior to specifying these products. Introduction Designed to Outperform Traditional Lumber LP® SolidStart® Laminated Veneer Lumber (LVL) is a vast SOFTWARE FOR EASY, RELIABLE DESIGN improvement over traditional lumber. Problems that naturally occur as Our design/specification software enhances your in-house sawn lumber dries — twisting, splitting, checking, crowning and warping — design capabilities. It ofers accurate designs for a wide variety of are greatly reduced. applications with interfaces for printed output or plotted drawings. Through our distributors, we ofer component design review services THE STRENGTH IS IN THE ENGINEERING for designs using LP SolidStart Engineered Wood Products. LP SolidStart LVL is made from ultrasonically and visually graded veneers arranged in a specific pattern to maximize the strength and CODE EVALUATION stifness of the veneers and to disperse the naturally occurring LP SolidStart Laminated Veneer Lumber has been evaluated for characteristics of wood, such as knots, that can weaken a sawn lumber compliance with major US building codes. For the most current code beam. The veneers are then bonded with waterproof adhesives under reports, contact your LP SolidStart Engineered Wood Products pressure and heat. LP SolidStart LVL beams are exceptionally strong, distributor, visit LPCorp.com or for: solid and straight, making them excellent for most primary load- • ICC-ES evaluation report ESR-2403 visit www.icc-es.org carrying beam applications. • APA product report PR-L280 visit www.apawood.org LP SolidStart LVL 2900F -2.0E: AVAILABLE SIZES b FRIEND TO THE ENVIRONMENT LP SolidStart LVL 2900F -2.0E is available in a range of depths and b LP SolidStart LVL is a building material with built-in lengths, and is available in standard thicknesses of 1-3/4" and 3-1/2". -
Steel Joists and Joist Girders
Steel Joists and Joist Girders • Fully updated to SJI 43rd Edition Standard Specifications • Load and weight tables for K, LH, DLH-Series and Joist Girders • Economical Design Guide load tables for lowest cost joist selection Introduction Table of Contents General JoistGeneral Introduction to Products and Services ....................................... 2 Information General Joist Information ......................................................... 7 SJI Bridging Tables Standard Joist Details Design Guide Sloped Seat Requirements Economical Standard and Special Joist Profiles Duct Opening Sizes Standard Bridging Details OSHA Highlights Ext., K-Series Top Chord Top Standard Joist Girder Details and Notes Load Zone Joists Bill of Materials Instructions Bill of Materials Joist Substitutes & Outriggers Economical Design Guide .......................................................26 LRFD and ASD Design Advantages Definition of Span Economical Load Tables KCS Joists KCS Top Chord Extensions, K-Series .............................................. 67 Joist Substitutes and Outriggers, K-Series ...............................70 Load Tables Load Tables KCS Joists ................................................................................ 74 Joist LRFD Joist LRFD Load Tables ............................................................78 K-Series LH-Series Load Tables DLH-Series Joist ASD Joist ASD Load Tables ............................................................ 91 K-Series LH-Series Tables Weight Load/Load DLH-Series Pages identified -
Residential Hip Roof Framing Using Cold-Formed Steel Members I
Residential Hip Roof Framing Using Cold-Formed Steel Members RESEARCH REPORT RP06-2 2006 American Iron and Steel Institute research report Residential Hip Roof Framing Using Cold-Formed Steel Members i DISCLAIMER The material contained herein has been developed by researchers based on their research findings and is for general information only. The information in it should not be used without first securing competent advice with respect to its suitability for any given application. The publication of the information is not intended as a representation or warranty on the part of the American Iron and Steel Institute, Steel Framing Alliance, or of any other person named herein, that the information is suitable for any general or particular use or of freedom from infringement of any patent or patents. Anyone making use of the information assumes all liability arising from such use. Copyright 2006 American Iron and Steel Institute / Steel Framing Alliance ii Residential Hip Roof Framing Using Cold-Formed Steel Members PREFACE The objectives of this project were to investigate a more rational rafter design methodology for both gable and hip roofs and develop all the necessary tables, details and specification requirements for hip roof framing members and connections for addition to the AISI Standard for Cold-Formed Steel framing – Prescriptive Method for One and Two Family Dwellings [Prescriptive Method]. This report accomplishes these objectives, provides useful insight and suggests future study topics that should assist in identifying and prioritizing future research needs. It is expected that portions of this report will indeed be incorporated in the Prescriptive Method. As such, the results of this work will have a lasting and beneficial impact on the steel- framed residential construction industry. -
Mitek Guidefor ROOF Trussinstallation
TIMBER ROOF TRUSSES MiTek GUIDE for ROOF TRUSS Installation The Timber Roof Trusses you are about to install have been manufactured to engineering standards. To ensure that the trusses perform, it is essential that they be handled, erected and braced correctly. 2019 - Issue 1 mitek.com.au TABLE OF CONTENTS Fixing & Bracing Guidelines For Timber Roof Trusses General .....................................................................................................................................................................................3 Design ......................................................................................................................................................................................3 Transport..................................................................................................................................................................................3 Job Storage ..............................................................................................................................................................................3 Roof Layout .............................................................................................................................................................................4 Erection and Fixing ...................................................................................................................................................................4 Girder and Dutch Hip Girder Trusses .......................................................................................................................................7 -
Ceilings and Attics: Install Insulation and Provide Ventilation
T e c h n o l o g y F a c t S h e e t CEILINGS AND ATTICS Foil-faced batt insulation is often used in bottom plate, seal penetrations through the For more information, contact: CEILINGS AND ATTICS cathedral ceilings because it has a 0.5 perm drywall, etc.). The open joist ends below the Energy Efficiency and rating and provides the permeability often knee wall should be plugged with squares of Install Insulation and Provide Ventilation Renewable Energy required for use in ceilings without attic cardboard, metal flashing, or rigid insulation; Clearinghouse (EREC) 1-800-DOE-3732 spaces. A vent baffle should be installed be- cellulose insulation blown at a high density; or BENEFITS OF CEILING INSULATION www.eren.doe.gov tween the insulation and roof decking to ensure batt insulation stuffed into plastic bags. The Insulating ceilings is one of the most ATTIC VENTILATION that the ventilation channel is maintained. plugs should be sealed to the joists using Or visit the BTS Web site at cost-effective energy efficiency measures. In Continuous ridge and soffit www.eren.doe.gov/buildings caulk or spray foam. If roof framing provides insufficient space for addition to reducing heat loss in the winter and vents form an effective attic Or refer to the Builder’s Guide required insulation, higher insulation values can The knee wall and attic floor in the attic space heat gains in the summer, ceiling insulation ventilation system. Ridge vent Energy Efficient Building be obtained by either attaching furring strips to behind it should be insulated to recommended improves comfort by bringing ceiling tempera- Association, Inc. -
Rolling Roof Trusses,” Pp
Rolling 94 FINE HOMEBUILDING Roof Trusses Factory-made trusses save time and give you a roof engineered for strength and stability BY LARRY HAUN oof trusses offer many advantages. They are lightweight (generally made from kiln-dried 2x4s), so they Rare fairly easy to handle. Because trusses are engineered, they can span longer distances without having to rest on interior bearing walls, allowing for more flexibility in room size and layout. Finally, installing trusses on most houses is pretty simple. If you want to get a house weatherized quickly, roof trusses are the way to go. Ceiling joists and rafters are installed in one shot, and no tricky cuts or calculations are required. Lay out braces as well as plates Laying out the top plates for trusses is the same as for roof rafters. Whenever possible, I mark truss locations on the top plates before the framed walls are raised, which keeps me from having to do the layout from a ladder or scaffolding. For most roofs, the trusses are spaced 2 ft. on center (o.c.). I simply hook a IT’S EASY TO KEEP A STRAIGHT FASCIA Even if the walls aren’t perfectly straight, the trusses can be. To keep the eaves aligned and the fascias straight, you can take advantage of truss uniformity. Snap a chalk- line along an outside top plate (top photo). Align a mark on the truss with the chalkline when you set the truss (photos right). DECEMBER 2004/JANUARY 2005 95 UNLOADING AND SPREADING TRUSSES SET THE STAGE Erected to ease installation, a temporary catwalk is completed before the trusses arrive in bundles (photo below). -
Timber Bridges Design, Construction, Inspection, and Maintenance
Timber Bridges Design, Construction, Inspection, and Maintenance Michael A. Ritter, Structural Engineer United States Department of Agriculture Forest Service Ritter, Michael A. 1990. Timber Bridges: Design, Construction, Inspection, and Maintenance. Washington, DC: 944 p. ii ACKNOWLEDGMENTS The author acknowledges the following individuals, Agencies, and Associations for the substantial contributions they made to this publication: For contributions to Chapter 1, Fong Ou, Ph.D., Civil Engineer, USDA Forest Service, Engineering Staff, Washington Office. For contributions to Chapter 3, Jerry Winandy, Research Forest Products Technologist, USDA Forest Service, Forest Products Laboratory. For contributions to Chapter 8, Terry Wipf, P.E., Ph.D., Associate Professor of Structural Engineering, Iowa State University, Ames, Iowa. For administrative overview and support, Clyde Weller, Civil Engineer, USDA Forest Service, Engineering Staff, Washington Office. For consultation and assistance during preparation and review, USDA Forest Service Bridge Engineers, Steve Bunnell, Frank Muchmore, Sakee Poulakidas, Ron Schmidt, Merv Eriksson, and David Summy; Russ Moody and Alan Freas (retired) of the USDA Forest Service, Forest Products Laboratory; Dave Pollock of the National Forest Products Association; and Lorraine Krahn and James Wacker, former students at the University of Wisconsin at Madison. In addition, special thanks to Mary Jane Baggett and Jim Anderson for editorial consultation, JoAnn Benisch for graphics preparation and layout, and Stephen Schmieding and James Vargo for photographic support. iii iv CONTENTS CHAPTER 1 TIMBER AS A BRIDGE MATERIAL 1.1 Introduction .............................................................................. l- 1 1.2 Historical Development of Timber Bridges ............................. l-2 Prehistory Through the Middle Ages ....................................... l-3 Middle Ages Through the 18th Century ................................... l-5 19th Century ............................................................................ -
Roof Truss – Fact Book
Truss facts book An introduction to the history design and mechanics of prefabricated timber roof trusses. Table of contents Table of contents What is a truss?. .4 The evolution of trusses. 5 History.... .5 Today…. 6 The universal truss plate. 7 Engineered design. .7 Proven. 7 How it works. 7 Features. .7 Truss terms . 8 Truss numbering system. 10 Truss shapes. 11 Truss systems . .14 Gable end . 14 Hip. 15 Dutch hip. .16 Girder and saddle . 17 Special truss systems. 18 Cantilever. .19 Truss design. .20 Introduction. 20 Truss analysis . 20 Truss loading combination and load duration. .20 Load duration . 20 Design of truss members. .20 Webs. 20 Chords. .21 Modification factors used in design. 21 Standard and complex design. .21 Basic truss mechanics. 22 Introduction. 22 Tension. .22 Bending. 22 Truss action. .23 Deflection. .23 Design loads . 24 Live loads (from AS1170 Part 1) . 24 Top chord live loads. .24 Wind load. .25 Terrain categories . 26 Seismic loads . 26 Truss handling and erection. 27 Truss fact book | 3 What is a truss? What is a truss? A “truss” is formed when structural members are joined together in triangular configurations. The truss is one of the basic types of structural frames formed from structural members. A truss consists of a group of ties and struts designed and connected to form a structure that acts as a large span beam. The members usually form one or more triangles in a single plane and are arranged so the external loads are applied at the joints and therefore theoretically cause only axial tension or axial compression in the members. -
Ceiling Joist Span Chart—Attics Without Storage
City of Republic—Community Development Ceiling Joist Span Chart—Attics Without Storage Revision Date: January 2017 2012 IRC Table R802.4(1) - Ceiling Joist Spans for Common Lumber Species (Uninhabitable Attics Without Storage, Live Load = 10 psf, L/Δ = 240) Dead Load = 5 psf Ceiling Joist Spacing 2 x 4 2 x 6 2 x 8 2 x 10 Species and Grade Maximum Ceiling Joist Spans (inches) Feet- Feet- Feet- Feet- inches inches inches inches SS 13-2 20-8 Note a Note a #1 12-8 19-11 Note a Note a Douglas Fir-Larch #2 12-5 19-6 25-8 Note a #3 10-10 15-10 20-1 24-6 SS 12-5 19-6 25-8 Note a #1 12-2 19-1 25-2 Note a Hem-Fir #2 11-7 18-2 24-0 Note a #3 10-10 15-10 20-1 24-6 12 SS 12-11 20-3 Note a Note a #1 12-8 19-11 Note a Note a Southern Pine #2 12-5 19-6 25-8 Note a #3 11-6 17-0 21-8 25-7 SS 12-2 19-1 25-2 Note a #1 11-10 18-8 24-7 Note a Spruce-Pine-Fir #2 11-10 18-8 24-7 Note a #3 10-10 15-10 20-1 24-6 SS 11-11 18-9 24-8 Note a #1 11-6 18-1 23-10 Note a Douglas Fir-Larch #2 11-3 17-8 23-0 Note a #3 9-5 13-9 17-5 21-3 SS 11-3 17-8 23-4 Note a #1 11-0 17-4 22-10 Note a Hem-Fir #2 10-6 16-6 21-9 Note a #3 9-5 13-9 17-5 21-3 16 SS 11-9 18-5 24-3 Note a #1 11-6 18-1 23-1 Note a Southern Pine #2 11-3 17-8 23-4 Note a #3 10-0 14-9 18-9 22-2 SS 11-0 17-4 22-10 Note a #1 10-9 16-11 22-4 Note a Spruce-Pine-Fir #2 10-9 16-11 22-4 Note a #3 9-5 13-9 17-5 21-3 Ceiling Joist Span Chart—Attics Without Storage Page 2 2012 IRC Table R802.4(1) - Ceiling Joist Spans for Common Lumber Species (Uninhabitable Attics Without Storage, Live Load = 10 psf, L/Δ = 240) Dead Load