矩形墩顶部横向内力分析

Analysis of Transverse Internal Force at Top of Rectangular Pier

采用通用有限元软件ABAQUS,针对矩形桥墩,对于规范JTG 3362—2018第8.4.7条关于墩顶横向拉力计算公式的适用条件进行了分析。结果表明:对于横向宽度、支座间距较小的矩形墩,规范计算公式具有较好的准确性,但对于横向宽度大于10 m、支座间距大于6 m的矩形墙式墩,规范计算公式的准确性较差,推荐采用有限元的计算方法。经计算,影响墩顶横向拉力的因素有桥墩横向宽度b、支座间距s、支座反力F_(d)。另外,矩形墩墩顶横向拉力大小在特定条件下不容忽视,其配筋需引起重视。

The general finite element software ABAQUS is used to analyze the applicable conditions of the computational formula on the transverse tension of pier top in Article 8.4.7 of JTG3362-2018 for the rectangular pier.The results show that for the rectangular pier with small transverse width and bearing spacing,the standard computational formula has better accuracy,but for the rectangular wall pier with the transverse width larger than 10 m and the bearing spacing larger than 6 m,the accuracy of the standard computational formula is worse.The finite element computational method is recommended.Through calculation,the factors affecting the transverse tension of pier top are the pier transverse width b,bearing spacing s and bearing reaction Fd.In addition,the size of the transverse tension at the top of the rectangular pier cannot be ignored,and its reinforcement should be paid attention to.