超高层建筑结构benchmark模型的地震损伤分析

通过弹塑性动力分析，对超高层建筑结构的benchmark模型在地震作用下的破坏机理与损伤分布进行研究。该模型的总高度为606.1m，采用巨型框架-核心筒-伸臂桁架钢-混凝土混合结构体系。利用PERFORM-3D软件建立了整体结构的非线性数值分析模型，对其进行弹塑性时程分析，研究结构在多遇、设防、罕遇地震与超罕遇地震作用下的地震反应和结构的破坏过程。分析结果表明：结构的抗震性能良好，在9度罕遇地震输入下结构未发生倒塌；结构的损伤主要集中在4～8区加强层的相近楼层，并随输入地震动强度的增强逐渐向各区中部开展；各类构件在不同水准地震作用下依次进入塑性状态，实现了结构多道防线的抗震设防目的。

Seismic damage analysis of a benchmark model for mega-tall buildings

The failure mechanism and damage distribution of the mega-tall building benchmark model was investigated by dynamic elasto-plastic analysis. The benchmark model with the height of 606.1　m used mega frame-core with outrigger steel-concrete composite structure system. An elasto-plastic model was established using PERFORM-3D software. The analysis was conducted in different seismic levels, i.e. frequent earthquakes, basic earthquakes, rare earthquakes, and extremely strong earthquakes to investigate the dynamic responses and failure process. The results show that the structure has a good seismic resistance. The structure will not collapse in rare earthquake of intensity 9. The structural damages concentrate on the stories close to the strengthened stories in zones 4-8, and the damage spreads to the middle of these zones as the seismic intensity increases. The concept of multiple seismic fortification lines has been well implemented. Different structural components yield respectively under different seismic intensities.