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桥梁设计审查发现的通病（之七）空心板

2013-12-15 21:54:24| 分类：桥梁设计审查 | 标签： |举报 |字号大中小订阅

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Since its first introduction in the 1950s in the US, a large number of side-by-side precast prestressed concrete box-beam bridges were constructed. 70年代开始中国也开始修建，因施工方便，中小桥需求量大，丛此一发不可收拾。

国内现行的公路桥梁空心板通用图，没有中间横膈板，没有横向预应力。而美国发现版缝开裂严重，已经使用有中间横膈板和横向预应力的空心板桥，见资料[1]和下图，其整体性比国内使用的设计好，减少单板受力的概率，为什么国内不仿照使用呢？

在设计审查时，明知剪力块不能抵抗板块分离，终究会单板受力，寿命不长，但是又能怎么样呢，通用图就这样啊！通用图到了更新换代的时候了。

不过也有问题，内模出不来啦。要用一次性模板，例如纸模，成本高些，但桥梁使用寿命长些。也有的施工单位在顶版留空，抽出内膜，再浇筑横隔版和留空的顶版。

11-1.transverse post-tensioning (TPT)

11-2.carbon fiber composite cables (CFCC)

参考资料

[1]Dr. Nabil F. Grace, Project Investigator and Dr. Elin Jensen, Co-Project Investigator. USE OF UNBONDED CFCC FOR TRANSVERSE POST-TENSIONING OF SIDE-BY-SIDE BOX-BEAM BRIDGES.MICHIGAN DEPARTMENT OF TRANSPORTATION .Department of Civil Engineering Lawrence Technological University

Southfield,February, 2008

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