整体式桥台的曲线箱梁剪滞效应研究  

A Study on Shear Lag Effect for Integral Abutment and Curved Box Girders

作　　者：彭大文[1] 林志平[2] 邓丽琼[2] 许晟[2] 

机构地区：[1]上海应用技术学院土木与建筑工程系,上海市200235 [2]福州大学土木工程学院,福州市350002

出　　处：《公路》2006年第12期9-14,共6页Highway

基　　金：上海教委重点项目资助(040A01);上海自然科学基金项目资助(05ZR14113)

摘　　要：针对整体式桥台的曲线箱梁固有的力学特性,建立有限元模型,对在不同荷载作用下剪滞系数的横向和纵向分布规律进行研究,并将结果与普通简支曲线箱梁进行比较。通过有机玻璃模型试验验证了有限元建模分析的可行性、准确性,同时做了参数分析,提出了供工程设计参考的实用剪滞系数计算图表。分析结果表明:该类箱梁剪滞分布与普通简支曲线箱梁的不同,主要在于剪滞系数内侧大而外侧小,以及在桥台附近截面出现了负剪滞现象;整体式桥台的等代桩长、桥台纵向抗弯刚度、宽跨比及箱梁肋板间距等,是影响该类桥梁剪滞系数的主要因素。In this paper, finite element models are established to analyze the shear lag effect of integral abutment and curved box girders （IACBG）. Different distribution laws of shear lag of IACBG are compared with the generic bridges. The accuracy of FEA method is proved by the plexiglass model test. The influence of structure parameters are analyzed and the practical tables calculating shear lag coefficient are provided. The rules of shear lag coefficients changing with the affecting factor are summarized. It is proved that the main affecting factors include： equivalent pile length, bending stiffness of abutment, ratio of width to span, distance of webs, etc.

关 键 词：桥梁 整体式桥台 曲线箱梁 剪滞效应 有限元法 模型试验 实用图表 

分 类 号：U448.42[建筑科学—桥梁与隧道工程]