长跨桥动力响应和局部破坏的多级数值分析

提出了长跨桥的结构动力响应和局部破坏的多级数值分析方法。首次研究了长跨桥有限元模型的多级数值分析的策略。基于设计图纸拓展了Tsing Ma桥的多级数值模型以及对此模型的策略。提出了动力响应和局部破坏的多级数值分析过程,连接焊缝处的局部退化过程能够解释破坏的主要作用和对结构响应的非线性影响。基于ABAQUS软件和改进程序,通过便于大型土木建筑应用的用户界面,实现了多等级计算。在将该方法应用于Tsing Ma桥之前,计算程序的精度通过两个典型实例进行验证。基于安装在Tsing Ma桥上的结构健康监测系统所获得的在线监测数据,在正常荷载下,采用拓展模型和计算程序对Tsing Ma桥的整体动力响应和桥的纵向桁架中两个典型焊接细部的局部损伤累积进行了数值分析。累积损伤的最大值出现在上部焊缝的脚部和/或斜杆与节点板相交的下弦杆处。全连接计算所得的疲劳寿命小于非全连接时的疲劳寿命,这说明在用多级数值计算方法分析结构损伤时应该考虑损伤与结构响应间明显的交互作用。

Multi-Scale Numerical Analysis on Dynamic Response and Local Damage in Long-Span Bridges

This paper aims to develop an approach for multi-scale numerical analysis on structural dynamic response and local damage in long-span bridges. The strategies of finite element modeling of long-span bridges for multi-scale numerical analysis was first investigated. A multi-scale model of the Tsing Ma Bridge (TMB) was then developed based on the design drawings and proposed strategies for multi-scale modeling. The procedures for multi-scale numerical analysis on the dynamic response and local damage are prop...