组合框架-高强钢板混凝土核心筒韧性体系抗地震倒塌性能评估  

Seismic collapse resistance assessment of composite frame-high-strength steel plate concrete core tube resilient structure system

作　　者：张磊 王翠坤 陈才华 崔明哲 Zhang Lei;Wang Cuikun;Chen Caihua;Cui Mingzhe(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2024年第7期1-8,73,共9页Building Science

基　　金：国家重点研发计划项目(2022YFC3802000);中国建筑科学研究院有限公司科研项目(20220122330730021);中建研科技股份有限公司科研项目(20221902970730032)。

摘　　要：本文针对一种高性能结构体系,即组合框架-高强钢板混凝土核心筒韧性体系,该体系包含双钢板混凝土组合剪力墙与可更换耗能连梁组成的核心筒,以及外围组合框架,核心筒组合墙体中钢板的强度等级最高为Q550、混凝土的强度等级最高为C100,以总高200m的高层建筑为例展开研究。设计并建立本高性能结构和常规钢筋混凝土框架-核心筒结构两个结构设计分析模型。以结构最大层间位移角(θ_(max))和最大残余层间位移角(θ_(res))为结构响应评估指标,基于增量动力分析法(Incremental Dynamic Analysis, IDA)分别对比研究这两种结构体系的抗地震倒塌能力。研究表明,相比常规结构体系,高性能结构体系可有效减小剪力墙厚度,降低结构自重,提升建筑使用空间;相比θ_(max),基于θ_(res)评估出结构抗地震倒塌性能略低,抗倒塌安全储备系数(Collapse Margin Ratio, CMR)降低约5%;高性能结构较常规结构抗地震倒塌性能更优,抗倒塌安全储备系数可提升约20%。The study focuses on a high-performance structure system,namely the composite frame-high-strength steel plate concrete core tube resilient structure system,which includes a core tube composed of double steel plate concrete composite shear walls and replaceable energy dissipation coupling beams,as well as the peripheral composite frames.The highest strength grade of steel plate used in composite walls of the core tube is Q550,and the highest strength grade of concrete is C100 respectively.Taking a 200 m building as an example,this study designs and establishes models for this high-performance structure and a conventional reinforced concrete frame-core tube structure.The _(max)imum story drift ratio(θ_(max))and the _(max)imum residual story drift ratio(θ_(res))of the structure are used as evaluation indicators for structural response.Based on the incremental dynamic analysis(IDA)method,the seismic collapse resistance of these two structure systems is compared.Research shows that compared to the conventional structure system,the new high-performance structures system can effectively reduce the thickness of shear walls,reduce the self-weight of the structure,and enhance the space for building use;Compared withθ_(max),the seismic collapse resistance of the structure based onθ_(res) is slightly lower,and the collapse margin ratio(CMR)is reduced by about 5%;High performance structures have better seismic collapse resistance than conventional structures,and the collapse margin ratio can be increased by about 20%.

关 键 词：高性能结构体系 框架-核心筒结构 高强钢材 超高强混凝土 抗地震倒塌性能 

分 类 号：TU398[建筑科学—结构工程]