m7l40

m7l40 - Module 7 Influence Lines Version 2 CE IIT,...

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Unformatted text preview: Module 7 Influence Lines Version 2 CE IIT, Kharagpur Lesson 40 Influence Lines for Simple Trusses Version 2 CE IIT, Kharagpur Instructional Objectives: The objectives of this lesson are as follows. Understand the bridge truss floor system and load transfer mechanism Draw the influence line for the truss reactions Draw the influence line for the truss member forces 40.1 Introduction In previous lessons, we have studied the development of influence lines for beams loaded with single point load, UDL and a series of loads. In similar fashion, one can construct the influence lines for the trusses. The moving loads are never carried directly on the main girder but are transmitted across cross girders to the joints of bottom chord. Following section will explain load transmission to the trusses followed by the influence lines for the truss reactions and influence lines for truss member forces. 40.2 Bridge Truss Floor System A typical bridge floor system is shown in Figure 40.1. As shown in Figure, the loading on bridge deck is transferred to stringers. These stringers in turn transfer the load to floor beams and then to the joints along the bottom chord of the truss. Front view Version 2 CE IIT, Kharagpur Floor plan Figure 40.1 Bridge floor system It should be noted that for any load position; the truss is always loaded at the joint. 40.3 Influence lines for truss support reaction Influence line for truss reactions are of similar to that a simply supported beam. Let us assume that there is truss with overhang on both ends as shown in Figure 40.2. In this case, the loads to truss joints are applied through floor beams as discussed earlier. These influence lines are useful to find out the support, which discussed earlier....
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This note was uploaded on 06/30/2009 for the course CE 358 taught by Professor Trifunac during the Fall '07 term at USC.

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m7l40 - Module 7 Influence Lines Version 2 CE IIT,...

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