强震作用下钢-混凝土结构弹塑性损伤分析

通过LS-DYNA程序二次开发了钢材的弹塑性损伤本构模型,并分别建立了钢框架和混凝土核心筒的损伤准则.对强震作用下某20层的钢-混凝土混合结构的层间位移、框架与核心筒之间剪力分配等进行了数值分析,结果表明混凝土核心筒变形能力较钢框架差,强震作用下容易在薄弱层处产生变形集中破坏;对两种结构体系损伤发展过程分析表明,损伤指数能很好地跟踪两种结构体系的抗震能力退化过程,该模型和损伤准则可以用于强震作用下钢-混凝土混合结构的弹塑性损伤分析.

Elastic-Plastic Damage Analysis of Steel-Concrete Hybrid Structure Under Strong Earthquake

In this paper,an elastic-plastic damage material model of steel is developed through the secondary devel-opment of LS-DYNA program,and the damage criteria of steel frame and concrete core tube are produced, respectively. As a numerical example,the inter-story drift and the shear force distribution between the frame and core tube of a 20,story steel-concrete hybrid structure are analyzed.The results indicate that the deformation capacity of core tube is much smaller than that of steel frame,and that the deformation concentration is obvious in the weak story. The analysis of damage process of two structural systems indicates that damage index can track the aseismic capacity degradation of frame and core tube precisely,and that the proposed models and damage criteria can be used to conduct the elastic-plastic damage analysis of hybrid structure under large earthquakes.