Based on one simply supported to continuous steel-concrete composite bridge in China,a structural design scheme of simply supported to continuous negative moment zone was proposed.By means of finite element analysis and real bridge test,the mechanical performance of the negative moment zone of the simply supported to continuous steel-concrete composite beam bridge was analyzed,the feasibility of the structural design was verified,and the measures to improve the cracking in the negative moment zone were discussed.The results show that for steel-concrete composite continuous beam bridge,the construction method of simply supported to continuous can reduce the negative bending moment of pier top compared with the welded continuous construction method.In the limit state of bearing capacity,the maximum crack width of concrete in the negative bending zone meets the specification requirements.The diameter of steel bar and the mechanical characteristics of concrete are the key factors affecting the cracking of the negative moment zone of the bridge panel.Appropriately increasing the diameter of steel bar of the bridge panel and using ultra-high performance concrete can effectively reduce the cracking of the concrete in the negative moment zone of the simple supported to continuous steel-concrete composite beam bridge.The jacking support method can reduce the negative bending moment of pier top to a certain extent,which is beneficial to control cracking.
simply supported to continuous steel-concrete composite beam bridgenegative moment zone structuremechanical characteristicfinite elementreal bridge test
NETL
NSTL
维普
万方数据
