矮墩四跨连续刚构受力性能优化参数化研究

摘要

文章以广西某高速公路跨江大桥为工程背景, 利用Midas Civil空间有限元软件, 建立了全桥整体计算有限元模型, 对影响矮墩四跨连续刚构结构受力的各种控制变量进行了参数化分析.仿真模拟结果表明:可通过优化承台顶标高、适当设置桩基偏心、优化承台形式与主梁合龙顺序及适当施加主梁预顶力等方式, 优化连续刚构的下构受力以满足设计和规范要求.最终得到该桥结构受力相对较优的连续刚构方案, 为类似工程项目的设计计算提供参考借鉴.%With an expressway cross-river bridge in Guangxi as the engineering background, this article establishes the calculation finite element model of whole bridge by using the Midas Civil space finite element software, and conducts the parametric analysis on various control variables affecting the structure force of short-pier four-span continuous rigid frame.The simulation results show that the underlying structure force of continuous rigid frame can be optimized to meet the design and specification requirements by optimizing the top height of the cap, appropriately setting the eccentricity of pile foundation, optimizing the cap forms and the main beam closure sequence, and appropriately adding the pre-jacking force of main beam.Finally, it obtains the continuous rigid frame scheme with relatively better structure force of this bridge, which can provide the reference for the design calculation of similar engineering projects.