Study on Mechanical Property of Sagging Moment Region of Box Girder with Corrugated Steel Web
To investigate the failure mode and mechanical property of sagging moment region of composite girder with prestressed corrugated steel webs,and to enhance the theoretical analysis system,a series of experiments are conducted to evaluate the flexural performance of sagging moment region.Firstly,a composite girder bridge with corrugated steel webs on an expressway in Gansu province is selected as the engineering background.Subsequently,3 test girders with prestressed corrugated steel webs with a scale of 1∶3 are designed and made for testing the flexural performance in sagging moment region.Furthermore,the finite element software ABAQUS is used to conduct an analysis on shear stress distribution along the length of girder with corrugated steel webs,as well as the lateral compressive stress distribution of concrete slabs.The result indicates that before the girder yields,the maximum crack width meets 0.15 mm specified in relevant specifications.The reinforcement strength has little effect on the longitudinal deflection of composite box girder with prestressed corrugated steel web,while increasing the ratio of reinforcement can improve the mechanical performance of girder,and reduce the deflection deformation of specimen effectively.When the test beam reaches yield,the effect of reinforcement strength on increase of internal force is more significant than that of reinforcement ratio.When the load level is high,a sudden change occurs at the longitudinal strain of corrugated steel web and lower flange for test girder,and increasing the reinforcement ratio can reduce longitudinal strain in the cross-section of composite box girder with prestressed corrugated steel web.Finite element calculation result indicates that the shear stress at corrugated steel web is larger in the area away from supports and diaphragms,and smaller at other locations whilst shear stress gradually reduces to about 75%of the maximum value within a range of 0.5 m from the support and diaphragm.The lateral stress distribution of concrete slab is relatively uniform,and thus the shear lag effect of specimen can basically be ignored.
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