Abstract
<p>In recent years, there have been some certain accidents happened during the construction of continuous pre-stressed concrete box girder (rigid frame) bridges that the upper and lower concrete along the ducts in bottom slabs has been generally destroyed during the tension process of the closure pre-stressed tendons. With the precise numerical analysis of the destruction mechanism of bottom slabs considering the material non-linearity, this paper reproduces the failure process of a typical accident, and analyzes the mechanism of the occurrence and the path of cracks on bottom slabs and the function of vertical tie bars in bottom slabs. Here the method of test analysis has been firstly used in the research of the destruction mechanism of bottom slabs of the depth-variation box girder to further verify and improve the knowledge of the destruction mechanism of bottom slabs and the function of vertical tie bars in bottom slabs.</p>
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