空心板梁桥“单板受力”病害机理及其加固处治研究

Study on mechanism and reinforcement processing of "single slab bearing" disease of hollow core slab beam bridge

首先建立了6种跨度空心板梁桥的梁单元模型,分析得出荷载横向分布规律.通过对一10 m跨度桥梁实体模型的数值分析,讨论了桥梁"单板受力"病害产生的原因,并提出了4种加固方案.然后通过比较分析底板竖向位移、横向应力以及等效应力;综合各方案的优缺点,确定了最优加固方案,为"单板受力"病害的防治提供了理论依据.最后提出了增加结构横向刚度、保证施工质量等措施,以期能有效地防治"单板受力"病害.

A beam element models of hollow core slab beam bridge was built firstly and lateral distribution of load is analyzed. Secondly through the numerical analysis with solid model of 10m-span bridge, the mechanism of ＂single stab bearing＂ disease are analyzed, four reinforcement schemes are brought forward. Thirdly vertical displacement, transverse stress and equivalent stress are analyzed and compared. Relative merits of the four schemes are synthesized and optimum reinforcement scheme is determined, it provides theoretical basis for disease control of ＂single slab bearing＂. In the end some measures are made for reference to department of design, construction and administration so that ＂single slab bearing＂ disease can be controlled radically.