强荷载作用下高架桥破坏倒塌的接触问题非线性研究

Viaduct bridge is the important component of modern transportation lifeline and urban lifeline, to ensure that its security under the blast loadings has important strategic significance and huge economic efficiency. This project according to the characteristics of the earthquake damage viaduct, grasp the nonlinear mathematical model of the contact problem, the modeling of the contact connection parts and the damage mechanism of viaduct to study the structure damage in the process of collapse in nonlinear contact problem. It's compared the differences between Goodman linkage element, Desai thin-layer contact element, linkage unit account of friction and the applicant previously developed elastic-plastic thin-layer linkage unit model,contacted the interconnection characteristics viaduct pseudo dynamic model test, get a variety of combined operating conditions of the nonlinear contact test results; With the test and compare the results improve elastic-plastic thin-layer linkage unit model; Using a variety of contact attaching unit models research the nonlinear property of the contact which is used in viaduct pile or pier and foundation, the structure and the upper structure, the key components of upper structure; Studying the damage mechanism of the viaduct structure reveal the damage which is caused by local damage and collapse of the bridge caused by viaduct contact connection parts of the collision, slipping, uplift, dislocation, disengagement, backfall etc.

高架桥梁是现代交通命脉和城市生命线工程的重要组成部分，确保其在强荷载作用下的安全性具有重要的战略意义和巨大经济效益。本项目针对高架桥震害特点，抓住接触非线性的数理模型比较、接触连接部位的模型化和高架桥破坏倒塌机制等三个关键科学问题，研究其在结构破坏倒塌过程中的接触问题非线性。对国际上现有的Goodman连接单元、Desai簿层连接单元、摩擦类连接单元与申请者先前开发的弹塑性薄层连接单元模型进行比较研究；进行高架桥接触连接特性的伪动力模型试验，获得多种组合工况下的接触非线性的试验结果；利用试验和比较研究结果完善弹塑性薄层连接单元模型；采用多种接触连接单元模型研究高架桥桥墩或桩与地基、下部结构与上部结构、上部结构关键构件间接触连接部位的接触非线性；深入研究高架桥结构的破坏倒塌机理，揭示高架桥接触连接部位的滑移、碰撞、提离、错位、脱开、滑落等造成的桥梁的局部破坏、桥面塌落等对桥梁结构的破坏作用。

高架桥梁是现代交通命脉和城市生命线工程的重要组成部分，确保其在强荷载作用下的安全性具有重要的战略意义和巨大经济效益。本项目针对高架桥震害特点，抓住接触非线性的数理模型比较、接触连接部位的模型化和高架桥破坏倒塌机制等三个关键科学问题，研究了其在结构破坏倒塌过程中的接触问题非线性。进行了高架桥接触连接特性的伪动力模型试验，获得了多种组合工况下的接触非线性的试验结果；采用多种接触连接单元模型研究了高架桥桥墩或桩与地基、下部结构与上部结构、上部结构关键构件间接触连接部位的接触非线性；深入研究了高架桥结构的破坏倒塌机理，揭示了高架桥接触连接部位的滑移、碰撞、提离、错位、脱开、滑落等造成的桥梁的局部破坏、桥面塌落等对桥梁结构的破坏作用。