聂建国¹   王寒冰¹   任明星²    陈 林^l

    （1 清华大学土木工程系 北京 100084； 2 北京市市政工程管理处 100013）

[提要]  钢-混凝土组合梁以其承载力高、刚度大等优点，在我国城市的立体交通建设中应用前景广阔。结合实际工程，介绍了钢  混凝土叠合板组合梁在桥梁改造加固中的应用。实践证明，钢-混凝土叠合板组合梁可以大幅度提高结构承载力，降低结构白重，减小挠度等，另外还可以节省支模，缩短施工周期。
[关键词]  桥梁  改造加固  叠合板  组合梁  工程应用

This paper introduces the application of composite steel-precast slab and concrete beams in the rehabilitation and strengthening of Weigou bridge in the suburb of Beijing. The practice has showed that using composite beams of steel and precast slab combined with concrete cast in-situ can increase the structure's load bearing capacity extensively, reduce the self-weight and deflection, simplify the construction procedure and shorten the construction period. Notable benefits of technology and economics, etc. are achieved from the engineering practice.
Keywords:  rehabilitation;  bridge;  composite beam; steel-precast slab; concrete cast in-situ;  engineering practice