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Geometric Design of a Highway Using Autocad Civil 3D Journal of Multidisciplinary Engineering Science and Technology (JMEST) ISSN: 2458-9403 Vol. 4 Issue 6, June - 2017 Geometric Design of a Highway Using Autocad Civil 3d S.A. Raji A. Zava K. Jirgba A.B. Osunkunle Snr Lect.: Dept. of PG Std. Dept. of Civil PG Std. Dept. of Civil PG Std. Dept. of Civil Civil Engineering, Engineering, Engineering, Engineering, University of Ilorin University of Ilorin University of Ilorin University of Ilorin [email protected] [email protected] [email protected] [email protected] Abstract - Roadway geometry design involves such tasks as creating the road alignment and Geometric design of roads can be subdivided into plotting the alignment profile using bearings or three main parts: horizontal alignment, vertical coordinates (easting and northing), stations and alignment and cross section, which when combined elevations of points along the proposed route; provide a three-dimensional layout for a highway [2, calculation of sight distances, radii of horizontal 3]. curves, and lengths of vertical curves; computation of earthwork quantities, and Horizontal alignment of a highway defines its location numerous other analyses and calculations aimed and orientation in plan-view. It comprises three at finding the optimum alignment while satisfying geometric elements, including tangents (straight design standards and constraints. When sections), circular curves and transition spirals performed manually, geometric design is very between tangents and curves [2] cumbersome, time-consuming and highly susceptible to very costly errors. Current trends The vertical alignment (or roadway profile) is the are geared towards the use of computer longitudinal section of the road, comprising such programs for roadway geometry design. The geometric elements as crest and sag curves, and the programs offer amazing precision and save lots gradients (straight grade lines) connecting them [1, 2] of time and effort. This paper presents a complete geometric design of a typical highway The highway cross section shows the position and using AutoCAD Civil 3D software. The aim of the number of vehicle and bicycle lanes and sidewalks project was to demonstrate how roadway along with their cross slopes; shoulders, drainage geometric design can be performed in a very ditches, etc. short time with much ease and precision. The road design procedure using AutoCAD Civil 3D Highway geometry elements are expected to be has been presented. Manual geometric design of selected, sized and positioned in a way that satisfies the same road was also performed, the results of such design criteria as sight distance, vehicle which was compared favourably with that of stability, driver comfort, drainage, economy, and AutoCAD Civil 3D. aesthetics. The design process involves some drafting and a number of analyses and calculations. Keywords—Geometric Design; AutoCAD The tasks which are usually performed by the design Civil 3D. engineer include: creating the road alignment and plotting the road profile using coordinates (or I. INTRODUCTION bearings), stations and elevations; calculation of sight Highways are expected to guarantee users’ comfort distances, radii of horizontal curves, and lengths of and safety, to permit efficient traffic operation, and at vertical curves; computation of earthwork quantities, the same time attract the least possible cost in and numerous other analyses and calculations aimed construction and maintenance. Highways are also at finding the optimum alignment while satisfying expected to cause minimum damage to the design standards and constraints. environment and be aesthetically pleasing in their finished form. Geometric design is the means Traditionally, these tasks are performed manually through which these demands are met. As the using drawing tools and mathematical techniques. Nigerian Federal Ministry of Works (FMW) Highway When performed manually, geometric design is very Manual [1] puts it, “geometric design focuses on the cumbersome, time-consuming and highly susceptible specific measures that provide for efficient and to very costly errors [4, 5] The traditional approach is appropriate operation of the road, as well as provide also based mainly on a two-dimensional (2-D) for all the specific details that make roads safe and analysis which does not guarantee a satisfactory compatible with social and environmental design, reports Yesser et al. [6] circumstances surrounding the road”. www.jmest.org JMESTN42352231 7415 Journal of Multidisciplinary Engineering Science and Technology (JMEST) ISSN: 2458-9403 Vol. 4 Issue 6, June - 2017 Current trends are geared towards the use of very i. BIM tools for civil engineering design: sophisticated computer programs for roadway AutoCAD Civil 3D supports Building geometry design that offer amazing precision and Information Modeling (BIM) and helps reduce save lots of time and effort. Autodesk [7] summarizes the time it takes to design, analyze, and the importance of specialized road design software implement changes. saying the tools help civil engineering professionals ii. Efficient civil design: AutoCAD Civil 3D working on transportation projects to: explore performs faster design iterations with an preliminary design options and optimize project intelligent, 3D model-based application that performance; determine optimal horizontal and dynamically updates related civil design vertical roadway geometry that are constrained by elements when changes are made. It design criteria; engineer roadway geometry in the streamlines time-consuming tasks for context of the existing environment more efficiently corridor design, parcel design, and pressure and effectively. The tools also enable engineers to and gravity network design. work with a more realistic model of what truly exists iii. It improves civil drafting and documentation. at the project site thereby affording engineers the Connecting design and documentation helps opportunity to consider safety requirements earlier in boost productivity and deliver higher-quality project development. As Ananya and Sahimol [4] put designs and construction documentation. it, these computer applications can produce amazing Changes to design elements are captured in visual graphics that enable the design engineer to documentation, minimizing manual updates. view the road on screen from the perspective of the iv. GPS surveying tools for faster processing. driver. They [4] further state that “without the use of GPS surveying and data collection tools in three-dimensional modeling, highway planning AutoCAD Civil 3D can help you update your experiences a significant difficulty. Cut and fill processes for improved project delivery. calculation tends to consume a significant amount of v. Integrated storm water management and time… By using the object-oriented approach, the geospatial analysis. AutoCAD Civil 3D helps process of cut and fill calculation can be performed the designer to improve project delivery and automatically and in an accurate manner”. make more informed decisions using visualization, simulation, and water analysis There are ongoing efforts to complete the integrated with the design process for storm development of campus road network of the water management, geospatial analysis, and University of Ilorin, located in southwestern Nigerian model analysis. town of Ilorin. One of the links in the road network that has been selected for development is the one III. DESIGN METHODOLOGY leading to students’ hostels from the University bus A. Survey Data Collection stop. This paper presents a complete geometric The existing ground surface data are required for design of this road using AutoCAD Civil 3D software. designing the geometry of highways. The survey The aim is to demonstrate how roadway geometric information of the proposed route was obtained from design can be performed in a very short time with the firm handling the development of the road. The much ease and precision so as to encourage civil survey information included Easting, Northing and engineering practitioners in the developing world to elevations of points along the proposed route. embrace the use of road design software. To provide a basis for comparison, manual design of the B. Design Criteria geometry of the same road was also performed. The following design criteria based on the Nigerian Federal Ministry of Works Manual [1] were assigned II. AUTODESK AUTOCAD CIVIL 3D to the horizontal geometry of the center line and also AutoCAD Civil 3D is a civil engineering design and to the profile and cross section of the roadway: documentation tool developed by Autodesk. i. Design speed = 60 km/h AutoCAD Civil 3D software supports Building ii. Superelevation rate = 4% Information Modeling (that is, digital representation of iii. Friction factor = 0.14 the physical and functional characteristics of a iv. Minimum Stopping Sight Distance = 130 m facility). It is used for modeling, analysis and design v. Minimum Passing Sight Distance = 540 m of a variety of civil infrastructure project types, vi. Maximum grade = 7% including roads and highways, land development, vii. Minimum K (rate of vertical curvature) for sag rail, airports, and water. AutoCAD Civil 3D helps civil curves = 30 infrastructure professionals improve project delivery, viii. Minimum K (rate of vertical curvature) for maintain more consistent data and processes, and crest curves = 26. respond faster to project changes, all within the ix. Roadway width = 12.8 m familiar AutoCAD environment [8] x. Carriageway
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