高层钢-混凝土混合结构地震作用下的能量反应分析

针对目前高层建筑混合结构中常用的外钢框架-内混凝土核心筒混合结构,从地震能量输入和结构能量耗散的角度对其进行了地震作用下的能量反应分析.通过选取不同的地震动参数对混合结构的总输入能及其在滞回耗能和阻尼耗能之间的分配情况进行了研究,明确了地震动各参数的变化对混合结构能量反应的影响;通过分析不同地震波作用下混合结构的滞回耗能在外钢框架和内混凝土核心筒间的分布以及在结构层间的分部情况知,底层剪力墙是整个混合结构中滞回耗能比较集中的区域,地震破坏最为严重.通过本文研究知,地震反应的能量分析方法是一种能较好反应混合结构在地震作用下的地震反应全过程及其弹塑性性能的方法.

Energy response analysis of high-rise steel-concrete hybrid structure

In this paper, the energy response method is used to study the seismic response of external steel frame and internal concrete core tube mixed structures under earthquake actions. It discusses the earthquake total input energy of the structure under different ground motion parameters, and the regularity of the total input energy between hysteretic energy and damping energy. Through analyzing the distribution of hysteretic energy between different floors and between external steel frame and internal concrete core tube of the hybrid structure, it shows that the hysteretic energy is mostly located in the bottom layer of the shear wall, the region where shows severe damage under earthquake action. Through the study, it is found that the energy responses analysis method is quite effective to reflect the seismic response process and the elasto-plastic performance of the steel-concrete hybrid structure under earthquake inputs.