跨中横隔梁对小箱梁桥极限承载力的影响  

Study on the Effect of Middle Diaphragm on Ultimate Loading Capacity of Multi-Box Girder Bridges

作　　者：杨万里[1] 项贻强 吴光宇[1] 汪劲丰[1] 朱汉华 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310027 [2]浙江省公路管理局,浙江杭州310009

出　　处：《江南大学学报（自然科学版）》2008年第6期708-714,共7页Joural of Jiangnan University (Natural Science Edition)　

基　　金：浙江省交通厅科技计划项目(2005H044)

摘　　要：以虚拟层合单元程序为基础,综合考虑结构的几何非线性和材料非线性,对一典型5跨简支连续小箱梁桥结构的极限承载力进行了分析,重点考察了在有、无跨中横隔梁时,结构从加载到破坏的全过程中受力性能的变化.计算结果表明:跨中横隔梁的设置,使得桥梁在弯矩工况下免于遭受箱梁间横向联系失效引起的局部破坏,结构的极限承载力可因此提高40%左右.跨中横隔梁的设置,还增强了桥梁的工作整体性和结构的延性.Based on the virtual laminated element program, the ultimate loading capacity of a typical 5- span prestressed concrete simply supported continuous multi-box girder bridge is calculated and analyzed by both the geometrical nonlinearity and material nonlinearity effect. The mechanical behaviour of the bridge with and without middle diaphragms in the loading-failure process is investigated in great detail. The numerical results show that the layout of the middle diaphragms keeps the bridge away from the local collapse caused by the failure of the transverse connecting plate between the box girders, and the ultimate loading capacity of the bridge may make a 40% increase in moment loading cases. Hence, the middle diaphragms effectively improve the integrity and ductility of the bridge.

关 键 词：小箱梁桥 跨中横隔梁 极限承载力 虚拟层合单元 非线性 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]