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    董煜瑜
    （上海工程勘察設(shè)計(jì)有限公司，上海200042）

[摘要] 對(duì)某鋼天橋的混凝土牛腿開裂原因進(jìn)行了現(xiàn)場考察和理論分析，確定是由于滑動(dòng)支座受到約束，溫度變化引起的內(nèi)力導(dǎo)致混凝土牛腿開裂。據(jù)此設(shè)計(jì)了加固方案，經(jīng)過加固后的天橋能正常使用。
[關(guān)鍵詞] 鋼天橋；牛腿；開裂；滑動(dòng)支座；溫度內(nèi)力；加固方案
中圖分類號(hào)：TU398.7    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：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