大悬臂预应力混凝土宽箱梁桥抗裂影响因素分析  

Analysis of the Cracking Resistance Factors of Prestressed Concrete Wide-box-girder Bridge with Large Cantilever

作　　者：贾布裕[1] 由瑞凯 余晓琳[1] 杨铮[1] 颜全胜[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]中交第二航务工程局有限公司,湖北武汉430063

出　　处：《公路工程》2016年第4期24-27,66,共5页Highway Engineering

基　　金：国家自然科学基金项目(51208208);中央高校基本科研业务费专项资金资助(2014ZZ0019);广东省交通运输厅科技项目(科技-2014-02-013)

摘　　要：针对大悬臂宽箱梁悬臂板根部容易开裂的问题,以某大悬臂预应力混凝土宽箱梁桥为工程背景,采用ansys软件建立精细的空间块体模型,设置9个荷载工况,分析预应力、恒载、偏载、对称活载、正温度梯度、负温度梯度、整体升温、整体降温、收缩变形对结构应力的影响,根据拉应力的分布,总结出各工况抗裂特点,得出对悬臂板根部横向拉应力影响大的主要因素为活载、负温度梯度、收缩变形。To analyze the problem of cracking resistance of the wide-box-girder bridge with largecantilever, using a prestressed concrete wide-box-girder bridge with large cantilever, as the research ob- ject, an accurate 3D mass finite element model was built by Ansys software for numerical analysis. 9 load cases（ prestress load, dead load, partial load, symmetrical live load, positive temperature gradient, neg- ative temperature gradient, the overall heating, the overall cooling and contraction deformation）were ap- plied to analyze the influence on structure stress. According to the distribution of tensile stress, the cracking resistance characteristics of each load case were summarized. The conclusion is that live load, negative temperature gradient and contraction deformation are three main factors on transverse tensile stress appearing in the root of the cantilever.

关 键 词：大悬臂 宽箱梁 抗裂 因素分析 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]