西南交通大学学报 2008, 43(5) 648-653 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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本文关键词相关文章
城市立交桥
牛腿开裂
补强预应力筋加固
模型试验
本文作者相关文章
蒲黔辉
勾红叶
张君华
PubMed
Article by PU Qianhui
Article by GOU Hongye
Article by ZHANG Junhua

城市立交桥牛腿开裂及加固的模型试验

蒲黔辉1, 勾红叶1, 张君华2

1. 西南交通大学土木工程学院, 四川, 成都, 610031;
2. 阿坝州公路管理局, 四川, 马尔康, 624300

摘要

为保障城市立交桥梁的安全运营,以成都市三环路牛龙路立交桥为工程背景,分别进行了主桥和匝道桥牛腿模型开裂及加固的试验研究.通过控制裂缝的区域、形状和大小模拟实桥牛腿开裂,分析引起牛腿开裂的因素;对开裂后的牛腿进行补强预应力筋加固,对比加固前后牛腿的应力,分析补强预应力筋锚下应力,考察该加固方法的有效性.研究表明:引起牛腿开裂的原因有预应力损失过大、重车影响和车辆偏载效应等;补强预应力筋加固切实可行.

关键词 城市立交桥   牛腿开裂   补强预应力筋加固   模型试验  

Model Test of Corbel Cracking and Reinforcement of Urban Overpass

PU Qianhui1, GOU Hongye1, ZHANG Junhua2

1. School of Civil Eng., Southwest Jiaotong University, Chengdu 610031, China;
2. Highway Management Bureau of Aba Prefecture, Maerkang 624300, China

Abstract:

In order to ensure the safe operation of urban overpasses,model tests of corbel cracking and reinforcement of the main bridge and ramp bridge of Niulong road overpass in Chengdu City were carried out respectively.By controlling the region,shape and size of cracks,corbel cracking of the overpass was simulated,and the factors to cause corbel cracking were analyzed.In addition,a comparative analysis of stresses in the corbel before and after strengthening prestressed reinforcement was made.Stresses under the anchorage of prestressed reinforcement were analyzed to investigate the effect of the reinforcement measure.The research shows that the reasons of corbel cracking are the great loss of prestress,the effect of loaded vehicles and the eccentric loading of vehicles,and the strengthening prestressed reinforcement measure is feasible.

Keywords: urban overpass   corbel cracking   strengthening prestressed reinforcement   model test  
收稿日期 2008-03-21 修回日期  网络版发布日期  
DOI:
基金项目:

通讯作者: 勾红叶(1983-),女,博士研究生,研究方向为大跨度桥梁结构行为,电话:13550076083,E-mail:gouhongye@163.com
作者简介: 蒲黔辉(1965- ),男,教授,博士生导师,研究方向为桥梁结构检测和模型试验,电话:028-87601662,E-mail:qhpu@rip.163.com

参考文献:
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