桥梁转体施工接触面应力分析及优化方法

Contact surface stress analysis and optimization in rotating superstructures

为了解决桥梁转体施工中大型接触体在高压状态下的接触问题,本文依据接触力学理论,考虑了聚四氟乙烯滑块在接触过程中的受力情况,提出了简化的接触力学模型。针对滑块的现行设计,采用提出的优化方法,并以茂湛铁路跨线桥为例,对其滑块分布进行了优化。相比简化前,简化模型在有限元分析中计算效率提高了近10倍。结果表明:采用优化方法可以节省22%的滑块,本文方法为转体施工的接触界面设计和分析提供了一种有效可行的思路。

To solve the problem of large contact body under high pressure in rotating superstructure construction of bridges,on the basis of the theory of contact mechanics,the stress of polytetrafluoroethylene slide plates during contact is considered for the first time in this study and a simplified contact mechanics model is proposed.The computational efficiency of the simplified contact mechanics model in the finite element analysis is nearly ten times higher than that before the contact mechanics model is simplified.At the same time,an iterative optimization method is proposed on the basis of the current design of the slide plates.Taking the Mao-Zhan Railway Bridge as an example,the slide plate distribution is optimized.Results show that under the condition that the contact stress meets the requirements,22%of the slide plates can be saved.The method proposed in this study can provide an effective and feasible approach for the design and analysis of the contact interface in rotating superstructure constructions.