竖向承重与水平抗侧相分离的组合结构体系在地震作用下的受力机理分析  

Force mechanism analysis of a composite structural system with separated gravity and lateral resisting systems under earthquake action

作　　者：赵鹤 陶慕轩 聂鑫[1] 侯兆新[3] 龚超[3] ZHAO He;TAO Muxuan;NIE Xin;HOU Zhaoxin;GONG Chao(Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Center of Steel and Concrete Composite Structures,Tsinghua University,Beijing 100084,China;China Metallurgical Construction Research Institute Co.,Ltd.,Beijing 100088,China)

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]清华大学北京市钢与混凝土组合结构工程技术研究中心,北京100084 [3]中冶建筑研究总院有限公司,北京100088

出　　处：《建筑结构学报》2021年第8期13-24,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51878378,51890903)。

摘　　要：为提升装配式建筑的抗震性能、提高其标准化程度,提出了竖向承重与水平抗侧相分离的组合结构体系(以下简称"可分体系"),以某六层办公楼工程为实例设计了可分体系的结构方案,并对其在地震作用下的受力机理与传统刚接组合框架结构体系(以下简称"传统体系")进行了对比研究。利用有限元软件Midas Gen进行反应谱法设计,在此基础上采用自主开发的COMPONA-FIBER纤维模型非线性有限元程序进行弹塑性时程分析,针对可分体系与传统体系的自振特性、弹塑性时程响应、结构整体破坏模式和关键构件受力特征等进行对比分析。结果表明:可分体系在水平地震作用下呈现与传统体系完全不同的变形模式、受力特征和破坏模式;在水平地震作用下,可分体系的变形模式以弯曲变形为主,顶层层间位移角最大;在可分体系中框架梁均为简支,仅承受竖向荷载,内力基本不随地震动变化,可以实现标准化设计制作,剪力墙和柱底部受力最大,其中剪力墙承担了大部分基底剪力,相比传统体系,剪力墙的设置会放大可分体系的基底剪力;罕遇地震作用下可分体系的破坏主要集中于剪力墙,为弯曲破坏模式,其底部损伤最大。In order to enhance the seismic behavior of prefabricated structures and to improve their standardization level, a new composite structural system with separated gravity and lateral resisting systems was proposed in this paper. The structural scheme of this new system was designed for an office building and a comparative study was conducted on the load carrying mechanism of the new structural system and a conventional rigid composite structural system under earthquake action. Based on the response spectrum design results from the finite element software Midas Gen, elasto-plastic time history analyses employing the self-developed three-dimensional finite element program COMPONA-FIBER were carried out. The self-vibration properties, dynamic responses, structural failure modes and mechanical characteristics of key components were discussed and compared in detail. The analysis results indicate that the new structural system demonstrates totally different deformation pattern, mechanical characteristics and failure modes from the conventional system. The deformation pattern of the new structural system under horizontal seismic action is mainly composed of bending deformation and the inter-story drift ratio of the top floor is the maximum. All the beams in the new structural system are simply supported and only resist the gravity loads, which is suitable for standardized design and production. The force at the bottom of the shear walls and columns in the new structural system is the largest, and the shear walls bear most of the earthquake action. Compared with the conventional rigid composite structural system, the arrangement of the shear walls tends to amplify the base shear of the structure. The damage of the new structural system under severe earthquake concentrates in the shear walls which demonstrates flexural failure with the most serious damage at the bottom.

关 键 词：组合结构 可分体系 弹塑性时程分析 受力性能 

分 类 号：TU375[建筑科学—结构工程] TU311.41