董煜瑜
    （上海工程勘察设计有限公司，上海200042）

[摘要] 对某钢天桥的混凝土牛腿开裂原因进行了现场考察和理论分析，确定是由于滑动支座受到约束，温度变化引起的内力导致混凝土牛腿开裂。据此设计了加固方案，经过加固后的天桥能正常使用。
[关键词] 钢天桥；牛腿；开裂；滑动支座；温度内力；加固方案
中图分类号：TU398.7    文献标识码：A  文章编号：1002-848X(2011) S2-0298-03

Analysis on cracking reason and strengtherung proposal for a steel platform bridge's RC corbel
Dong Yuyu
( Shanghai Architectural and Engineering Consultants Co.,  Ltd.,  Shanghai 200042,  China)

Abstract: Several cracking reasons were analyzed by site walk and calculation for a steel platform bridge's RC corbel. The conclusion is that the corbel cracked because the sliding supports are limited for lateral deflection with temperature load. A strengthening proposalis got based on the analysis, which is proved to be reasonable by the successful work of the strengthened platform bridge.
Keywords: steel platform bridge; RC corbel; crack; sliding support; temperature load; strengthening proposal