Based on an existing girder bridge with steel I girders and concrete panels,the 1:10 scale composite girder specimens,including a group of composite girders with corrugated steel webs and UHPC deck panels,a group of composite girders with flat webs and UHPC deck panels,and a group of composite girders with corrugated steel webs and normal concrete(NC)deck panels,were prepared for three-point bending tests.The influence of types of webs and deck panel strength on the failure mode of the hogging moment zones,crack distribution feature,and ultimate flexural strength of the composite girders,was analyzed,and the method to calculate the ultimate flexural strength of the bending moment zones in the composite girders with corrugated steel webs and UHPC deck panels was proposed.It is shown that the composite girders in all the three groups reveal typical flexural failure.The cracks in the UHPC deck panels are narrow and dense,while those in the NC deck panels are wide and sparse.Compared with the flat webs,the corrugated steel webs can improve the cracking resistance of the deck panels.The compressive strain-hardening effect in the bottom flange of the composite girders with corrugated steel webs and UHPC deck panels is more significant than that in the composite girders with flat webs and UHPC deck panels,but the ultimate flexural strengths in the hogging moment zones of the two are close.The girders with UHPC deck panels exhibit cracking resistance that is two times of that of girders with NC deck panels,and the initial flexural stiffness is improved by 43％.Compared with the plastic yielding theory,the proposed method that considers the compressive strain-hardening effect in the bottom flange generates the ultimate flexural strengths that approximate the test values,which can be used for engineering estimation.
segmental girder bridge/steel I girder and concrete panel composite girder bridge/corrugated steel web and UHPC panel composite girder/hogging moment zone/cracking load/flexural strength/stiffness/three-point bending test
维普
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