The works involved in this project were mainly focused on steel roof truss to sustain the designed load after experienced corrosion to some of the members and failure at some of the joints. The truss bridge was designed to determine member sizes, extract a bill of materials and apply live project cost rates for a range of geometry. It lets you draw a truss structure and calculate truss problem. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by. The way these triangles are arranged or shaped is the essence of truss design. Truss structures university of kentucky college of. We were to come up with a prototype using wood craft sticks and white elmers glue. The 4 key roles in the design construction process. Truss is a structure which is commonly used in the construction of bridges. This system used load and resistance factors to ensure a stable bridge with sufficient strength. Building structure report project 1 by vicky lee issuu. Key words truss bridges, bridge rails, bridge decks.
Engr 100 final bridge report university of washington. This is the culmination of seven years of effort beginning in 2005. Design and build a model truss bridge bridge design contest. The steel bridge team considered two bridge types for the design. This figure shows the members lengths calculations for the first diagram. On graph paper, draw the side view of your truss bridge. What are truss bridge designs and how do they really work. A presentation on truss bridges and its types by azaz ahmed cib09015 contents about truss and truss bridges truss configurations types of truss bridges choice of truss type and configuration design algorithm related advantages and disadvantages. Design of industrial truss university of asia pacific. Bctc hopes to identify a bridge design to serve their growing populations. Stresses in the bridge deck with two trucks are on the bridge. Dynamic impact factors on existing long span truss railroad bridges.
The purpose for writing this report is to document the design and performance of your prototype and final. The study of eigenfrequencies is important with respect to the excitation and. For larger spans, a truss with a polygonal upper cord, such as the parker truss, is used for some savings in material. Edsgn100 truss bridge design final design report executive summary we were approached by a company to design a bridge that was strong, aesthetically pleasing, and economically efficient. This nchrp report provides, for the first time, guidance for decisionmaking on historic bridge rehabilitation. During the long journey they had achieved several heights and continuing to excellence. It increases the span mean life span of any construction like bridge or building trusses have some disadvantages also.
Steel bridge design had not been standardized each bridge was an original design that requires time and money, whereas concrete bridges are standardized designs the sssba developed standard simplespan and modular designs espan140 short span steel bridge design. It incorporated triangular trusses that extended to the maximum height allowed which created stability and helped dissipate the. Devon railroad bridge available for testing and other inkind contribution. There was two member lengths calculated using pythagoras method, we found the lengths for a 12 members to be 99mm long. You can modify these existing projects or start with a new one.
Design of a truss bridge for low cost using structural. Abstract the purpose of this example is to illustrate the use of the aashto lrfd bridge design for the design of a continuous two span steel igirder bridge. The audience of this report is the instructor and ta, and the tone should be formal. Dynamic impact factors on existing long span truss. Common types of trusses bridge trusses in particular, the pratt, howe,and warren trusses are normally used for spans up to 61 m in length. A truss bridge is a bridge whose loadbearing superstructure is composed of a truss, a structure of connected elements usually forming triangular units. The results showed an average reduction in cost for the truss bridge of approximately 3% by using the optimised geometry. Bridge design tutorial pratt vs howe truss duration. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. This project was pretty fun for me and it taught me a lot about truss bridges. Technical report pdf available january 2017 with 698 reads.
Simple truss solver, as the name suggests, is a free truss design calculator software. Synopsis since inception of indian railways in 1853 the railway engineers has history of more than 250 years of construction and maintenance of railway bridges. Since the design truss has a long span, design sections will be chosen from double angle sections rather than single angle sections, which are chosen for smaller trusses. You will see examples of the most common designs further on this page. Trusses are popular for bridge building because they use a relatively. Truss gives more support and allows the builders to use fewer materials to achieve any construction. This project taught me what the process is to design bridges, what types of truss bridges are the strongest, and how real bridges are constructed and tested. Objective the objective of the project is to build a truss that would be able to take a specific amount of downward force remarkably with respect to the weight of the truss itself, i. With its picturesque design, the wooden truss bridge has a near universal appeal. Dartmouthx the engineering of structures around us,652 views 15. You and your group will be performing selfevaluations following each written report. How trusses behave analyzing compression and tension in a truss by example duration.
We were given specific specifications that we needed to follow, or else or. Overview design it is the essence of engineering topics of discussion. These terms will be helpful to keep in mind as we talk more about truss design. You may use a successful design from west point bridge design or an existing bridge. Buckling calculations 2 weak cr 2 ei p l buckling force. Planar truss, on the other hand has a 2dimensional design. Engr 100 final bridge report group assignment your team is responsible for composing a single final report that describes in detail your bridge design. Plate girder shear and flexural strengthening design example. This design was modified later and other calculations were made this figure shows how the length of members was calculated for the final design. Weiwei lin, teruhiko yoda, in bridge engineering, 2017. The bridge is intended to carry only mass transit, bicycles, pedestrians, and emergency vehicles, similar to the portlands ridge of the people. Truss structure comprising one or more triangular units constructed with straight members whose ends are connected at joints.
Dynamic impact factors on existing long span truss railroad bridges final report for rail safety idea project 25. Truss bridge, bridge with its loadbearing structures composed of a series of wooden or metal triangles, known as trusses. The bridge is to be designed, fabricated, and constructed in accordance with the rules and. The hard work of the national steel bridge alliance nsba and prime consultant, hdr engineering and their subconsultants in producing this handbook is gratefully acknowledged. The wooden deck is designed to carry full livestock loads. This design example was edited in 2012 by hdr engineering, inc. In the process of designing a truss bridge, along with application of newtons laws of motion, certain assumptions are taken into consideration. Pdf steel truss bridges are an efficient and aesthetic option for highway crossings. Truss is a structure of connected elements forming triangular units, and a bridge whose loadbearing superstructure is composed of a truss is a truss bridge.
The design project submitted in this report was analysis and design checking and also a forensic investigation of larkin stadium, johor bahru. It comes with some predesigned projects including bridge 3 trusses with forces, one trusstension, vaulted parallel chord, etc. In addition to this, during construction of the bridge, we established practices for traffic control in. The report, however, does not include specific examples or case studies. The connected elements typically straight may be stressed from tension, compression, or sometimes both in response to dynamic loads. Final report case studies on the rehabilitation of. Investigation of prefabricated steeltruss bridge deck systems. In truss bridge, it takes up more space and can sometimes become a distraction to drivers.