强载荷下结构动力响应与损伤的跨尺度分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (23) : 16-25.

论文

强载荷下结构动力响应与损伤的跨尺度分析

汤轶群,李兆霞

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Analyses on Damage and Dynamic Response of Structures under Strong Loads by Trans-scale Modeling

Tang Yiqun, Li Zhaoxia

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摘要

结构多尺度有限元模拟是考虑结构易损部位损伤演化进行大型结构失效过程分析的有效方法。如何方便、准确地建立有限元大尺度与小尺度模型的跨尺度界面连接是多尺度有限元模拟中的关键。本文根据损伤多尺度分析的需求，研究了两种跨尺度界面连接方法及其实施过程，并对计算方法的精度进行了比较和验证；将塑性损伤演化本构关系通过ABAQUS提供的UMAT子程序写入，考察狗骨式刚节点在强动载荷作用下其薄弱区域的损伤演化特性，结合跨尺度界面连接方法初步实现了强载荷下结构损伤的跨尺度分析；针对某大跨悬索桥钢箱梁纵向加劲钢桁架结构，采用本文建立的跨尺度分析方法研究了强载荷作用下结构中的损伤演化过程。研究结果为揭示结构在强载荷作用下的损伤破坏机理奠定了基础。
关键词：多尺度模拟；界面连接；位移约束方程；材料非线性；损伤演化

Abstract

Structural multi-scale modeling is an efficient way to carry out analyses on structural failure process by considering local damage evolution on component details. One of the key issues in structural multi-scale modeling is how to connect conveniently and accurately models in the big- and small- scales on the trans-scale boundary. In this paper, two kinds of methods have been investigated for the trans-scale connection by using displacement consistent and stress continuous conditions respectively. The computation is implemented by specific supplemental software developed on the basis of the commercial software package ABAQUS, for researching the damage evolution process of the local damage zone in the dog-bone joint component and realizing the analyses on damage of structure under strong loads by trans-scale modeling combining with the connection of the trans-scale boundary . This calculation method is then applied to analyses on dynamic response and damage of a steel truss as a typical stiffening truss in long-span bridge deck. The calculated results lay a foundation that reveal the damage mechanism of the structure under strong loads.

导出引用

汤轶群;李兆霞. 强载荷下结构动力响应与损伤的跨尺度分析[J]. 振动与冲击, 2012, 31(23): 16-25

Tang Yiqun;Li Zhaoxia. Analyses on Damage and Dynamic Response of Structures under Strong Loads by Trans-scale Modeling[J]. Journal of Vibration and Shock, 2012, 31(23): 16-25