（1 联安国际建筑设计有限公司， 北京 100120； 2 奥雅纳工程顾问， 深圳 518048；

 3 哈尔滨工业大学深圳研究生院， 深圳 518055）

［摘要］为深入了解桁腹式组合桁梁桥节点区域的剪力滞效应，通过建立简支桁腹式组合桁梁桥ABAQUS有限元模型，以梁桥承受竖向荷载时的节点为观察对象，在宽度和长度两个维度上量化分析桥面板的纵向正应力、剪力滞系数和有效宽度的规律。模拟结果显示，桥面板同时存在剪力滞效应和负剪力滞效应，在节点区域效应最严重，各节间中点区域剪力滞效应较低。按规范计算的简支箱梁桥有效宽度与桁腹式组合桁梁桥上有效宽度最大值相当，但与最小有效宽度差异较大。

［关键词］桁腹式组合桁梁桥； 受力性能； 剪力滞效应； 数值模拟

中图分类号： TU375 文献标识码： A文章编号：  1002-848X(2016)S1-0600-04

Shear lag effect analysis of steel-concrete composite truss bridge

Sun Weibin1, Wu Zihong2, Li Zuohua3

（1 L.A. International Architectural Design Co., Ltd., Beijing 100120, China; 2 ARUP, Shenzhen 518048, China;

3 Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China）

Abstract:  In order to figure out the shear lag effect of simply supported steel-concrete composite truss bridge, the model was built and performed by ABAQUS. The observation of the normal stress, coefficient of shear lag and effective width in both lengthwise and broad wise direction were carried out. The results show that both shear lag and negative shear lag effect exist, which are most serious on the joint, but almost disappear on the midpoint of segment. The maximum effective width of the bridge is almost equivalent to the one calculated by specification of simply supported box girder, but a big gap from minimum effective width.

Keywords: steel-concrete composite truss bridge; bearing performance; shear lag effect; numerical simulation

通讯作者： 李祚华，博士，副教授，Email：lizuohua@hit.edu.cn。

*国家自然科学基金面上项目(51378007)，深圳市科技计划技术开发项目(CXZZ20140904154839135)。