工字梁腹板拉力场理论的修正  

Modification of Tension Field Theory on I-girder Web

作　　者：康孝先[1] 强士中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2008年第1期77-81,共5页Journal of Southwest Jiaotong University

基　　金：交通部西部交通建设科技项目(200431822317)

摘　　要：为了考虑翼缘对腹板的约束和结构的初始缺陷,通过非线性有限元分析和试验结果的比较,指出了Basler拉力场理论、Rockey拉力场理论的优缺点以及它们的适用范围——腹板高厚比hw/tw≥160.考虑翼缘的约束,得到了反映翼缘对腹板嵌固效应的系数——嵌固系数;利用得到的嵌固系数,对Basler拉力场理论进行了修正,修正后的拉力场理论与试验数据和非线性有限元法计算结果相符.研究结果为桥梁、钢结构设计和相关规范的修订提供了参考.To take the restraint provided to I-girder webs by the flange and the initial imperfection of structure into account, the advantages and disadvantages of the Basler tension field theory and the Rockey tension field theory were discussed based on a comparison between the nonlinear FEM （finite element method） analysis and test results, and the applicable range of these tension field theories was pointed out, i. e. , depth-thickness ratio of web hw/tw ≥160. A formula was proposed for the shear buckling coefficient to describe the restraint of the flange, and the proposed formula was used to modify the Basler tension field theory. The modified tension field theory considering the contribution of the flange was applied to predict the shear resistance of webs, showing an excellent accuracy. The research provides a reference for the designs of steel bridges and other steel structures and the emendation of the related norms.

关 键 词：剪切屈曲 拉力场理论 腹板 极限承载力 

分 类 号：U448.212[建筑科学—桥梁与隧道工程]