波形钢腹板梁变形计算的有效刚度法  

EFFECTIVE STIFFNESS METHOD FOR CALCULATING DEFLECTION OF CORRUGATED WEB GIRDER

作　　者：聂建国[1] 李法雄[1] 樊健生[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2012年第8期71-79,共9页Engineering Mechanics

基　　金：铁路桥梁设计关键技术研究-双重组合作用连续组合梁桥设计关键技术研究项目(2009G003-B);长江学者和创新团队发展计划项目(IRT00736)

摘　　要：为研究波形钢腹板剪切变形对波形钢腹板梁受力行为的影响,引入腹板剪切变形转角函数,将波形钢腹板梁的弯曲行为分解为桁架作用和弯曲作用,建立一个能够考虑波形钢腹板剪切变形的波形钢腹板梁理论模型,推导了简支和悬臂波形钢腹板梁在不同类型荷载作用下的变形解析解,采用有限元方法验证了理论模型和解析解的正确性和适用性。根据变形等效原理,引入重要影响参数对波形钢腹板梁的变形解析解进行简化,提出了考虑腹板剪切行为的波形钢腹板梁变形简化计算方法——有效刚度法。用该文提出的有效刚度法计算波形钢腹板梁在正常使用极限状态下的变形值和试验结果吻合良好,为波形钢腹板梁在正常使用极限状态下的挠度计算提供一种准确性较高的简化计算方法。By introducing a shear rotation function accounting for the shear deformation in the webs, the paper presents a beam theory model of corrugated web girder, where the flexural behavior of corrugated web girder is modeled as the combination of truss action and bending action between upper flange and lower flange. Then analytical solutions for simply supported corrugated steel web girders and cantilever corrugated steel web girders are derived under uniformly distributed load and concentrated load, and the analytical solutions are well verified through a comparison with FEM results. In order to determine the deformation of corrugated web girders for the purpose of practical design, a simplified design method to calculate the deflection of corrugated web girders considering web shear deformation is presented by introducing an importance parameter. The deflections calculated by this method agree well with those obtained from experiments. According to the comparison of calculated deflections among different design methods for corrugated web girders, the simplified method presented in this study has good accuracy and is convenient to use.

关 键 词：波形钢腹板梁 剪切变形 变形 有效刚度 试验 

分 类 号：U448.213[建筑科学—桥梁与隧道工程] TU391[交通运输工程—道路与铁道工程]