纵向预应力对连续箱梁桥中跨跨中变形的影响分析  

Analysis on Influence of Longitudinal Prestress on Midspan Deformation of Continuous Box Girder Bridge

作　　者：刘凯 Liu Kai(Transfigure Design Co.,Ltd.,Changsha 410000,China)

机构地区：[1]创辉达设计股份有限公司,长沙市410000

出　　处：《北方交通》2022年第3期21-23,27,共4页Northern Communications

摘　　要：较多的连续梁桥在运营期间出现跨中变形量下降幅度过大的病害现象,结合一座PC连续梁桥进行有限元数值模拟,通过不同的纵向预应力设计方案,对计算得到的中跨跨中变形量进行对比分析,探讨运营期间跨中变形量随纵向预应力钢束位置、张拉控制应力、张拉方式和钢束松弛类型变化的规律,为后续的连续梁桥设计与运营管养提供一定的参考。Many continuous girder bridges have the phenomenon of disease that the midspan deformation decreases too much during the operation.In combination with a PC continuous girder bridge,the finite element numerical simulation is carried out.The calculated midspan deformation is compared and analyzed through the design schemes for different longitudinal prestress,and the law of the midspan deformation changes as longitudinal prestress-steel,tensioning control stress,tensioning mode and steel tendon relaxation type during the operation is discussed,so as to provide a certain reference for the subsequent design,operation,management and maintenance of continuous girder bridges.

关 键 词：纵向预应力 连续箱梁桥 运营期间 中跨跨中变形 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]