温差和荷载引起的FRP-钢组合梁界面剪应力分析  

Interfacial shear stress of FRP-Steel composite beams subjected to temperature and load action

作　　者：朱坤宁[1] 万水[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《解放军理工大学学报（自然科学版）》2011年第4期387-392,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50878048);国家863计划资助项目(2006AA11Z103);河北省交通厅科技重点资助项目(Y-060136)

摘　　要：为了解FRP-钢组合梁桥的连接界面受力特性,分析外荷载对FRP桥面板与钢纵梁连接界面的剪应力分布的影响,利用接触面层间纵向伸长相等条件,建立组合梁在温度差异和均布荷载作用下弯曲变形时的内力平衡方程,推导了计算公式,阐明了界面剪应力分布特性。结果表明,在温差作用下,组合梁跨中界面剪应力最小,越靠近组合梁端部界面,剪应力增大越快;在均布荷载作用下,组合梁界面剪应力呈线性分布,跨中最小,端部最大。分析结果对FRP-钢组合梁桥的连接界面剪力件的设置有一定的参考价值。To comprehend the mechanical properties at the connection area of FRP-steel composite girder bridge and analyze the interfacial shear stress subjected to load action,the condition that the longitudinal deformation of FRP equals to that of the steel beam at the contact surface was used,the internal force balance equation was set up,and the distribution of the interfacial shear stress was studied.The interfacial shear stress caused by the temperature load is approximately zero near the middle of the composite beam,and increases fast towards the end of the beam.Uniformly distributed load leads to linear distribution shear stress with the minimum at the middle place and the maximum at the end of the beam.The result is valuable for the design of shear connections of FRP-Steel composite beams.

关 键 词：组合梁桥 FRP桥面板 温度影响 荷载影响 界面剪应力 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]