PC梁桥结构参数对最大悬臂结构力学性能的敏感性分析  

Sensitivity of Structural Parameters of PC Girder Bridge to Mechanical Property at Maximum Cantilever Stage

作　　者：赵晓华[1,2] 孙航[3] 张谢东[1] 潘博[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]空军第一建筑安装工程总队,北京100076 [3]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150000

出　　处：《公路交通科技》2011年第11期95-99,共5页Journal of Highway and Transportation Research and Development

摘　　要：为了深入研究PC梁桥结构参数对最大悬臂结构力学性能的影响,结合实体工程,建立了大跨预应力混凝土梁桥的最大悬臂段有限元模型,分析了材料容重、混凝土弹性模量、预应力参数偏差对最大悬臂施工阶段主梁线形的影响程度,研究了自重偏差对主梁结构内力和应力的影响,探讨了预应力对悬臂结构的作用效应。研究结果表明:材料容重和混凝土弹性模量为该桥梁结构的主要设计参数,桥梁自重偏差对结构线形影响最为明显;在预应力效应的作用下,主梁纵向产生竖向正位移,随着自重的增大,主梁同一截面正弯矩相应减小,墩顶负弯矩增大,主梁的上缘压应力会减小,下缘压应力会增大,且下缘应力受其影响的程度更大。In order to study the influence of structural parameters of PC girder bridge on the mechanical property at maximum cantilever stage,combined with a real project,the finite element model of long-span PC girder bridge cantilever segments was established.The influences of material bulk density,concrete elastic modulus,prestressed parameter deviation on girder geometric shape at maximum cantilever construction stage were analysed.The influence of dead weight deviation on girder internal force and stress was researched,and the effect of prestress on the cantilever structure was discussed.The result of research shows that（1） material bulk density and concrete elastic modulus are the main design parameters of the bridge structure,and the influence of bridge dead weight deviation on the linear of structural geometric shape is most obvious;（2） under the influence of the prestress,vertical positive displacement occurred in the longitudinal direction of main girder;（3） with the increment of the dead weight,the positive bending moment of same cross-section on the main girder reduced correspondingly,the negative bending moment at the pier top increased,the compressive stress at the upper edge of the main girder decreased,while that at the lower edge increased,which was more affected by the dead weight.

关 键 词：桥梁工程 结构参数 敏感性分析 预应力混凝土梁桥 最大悬臂阶段 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]