Abstract
: In the literature, provisions for analysis and design of steel-RCC composite deck type truss and cable-stayed bridges do not exist. A composite deck type truss bridge model is analyzed using STAAD Pro V8i software and a model with the same dimensions is tested in the laboratory. The experimental test results are used to validate the STAAD analysis results.
 Bottom chord strain and mid-span deflection of the composite bridge model as found from the STAAD analysis and the laboratory experiment closely tally with each other. This validates the standard STAAD analysis results. However, in the top chord member, due to shrinkage cracks in the deck slab concrete, the experimentally recorded strain is higher by about 100% than the STAAD analysis result. 
 Shear force in studs is considerably large near supports and joints as compared to the midsection. Therefore, the design of shear studs may be carried out based on the shear forces in the studs found from the STAAD analysis. 
 Thus it is recommended that STAAD or any other standard finite element analysis software can be used for analysis and design of the composite bridges.
Highlights
Top chord compression members of a supported steel truss bridge may prematurely and suddenly buckle before the material reaches its full compressive strength
[4] FEM software is presented the results of which are validated using findings of the experimental tests. Based on this use of any standard FEM software for modeling and analysis of composite steel truss bridges is recommended
As the STAAD model is validated, the design of shear studs may be carried out based on the shear forces in the studs found from the STAAD analysis. 5.0 ADVANTAGES OF THE COMPOSITE ANALYSIS IN BRIDGE DESIGN
Summary
Top chord compression members of a supported steel truss bridge may prematurely and suddenly buckle before the material reaches its full compressive strength. In 2012, an open web steel girder non-composite deck bridge of 190m total continuous span (40m+110m+40m) suddenly collapsed (figure 1) during casting of the deck slab due to buckling of its top chord member U13U14 [1]. Steel truss and cable-stayed bridges, provided results of the analysis are validated. Analysis of a composite bridge model using STAAD Pro V8i [4] FEM software is presented the results of which are validated using findings of the experimental tests. Based on this use of any standard FEM software for modeling and analysis of composite steel truss bridges is recommended
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