Collapse assessment and seismic performance factors intall tube-in-tube diagrid buildings

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Earthquakes and Structures Pub Date : 2020-09-01 DOI:10.12989/EAS.2020.19.3.197
A. Khatami, Mahdi Heshmati, A. Aghakouchak
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引用次数: 4

Abstract

Diagrid structures have been introduced as a fairly modern lateral load-resisting system in the design of high-rise buildings. In this paper, a novel diagrid system called tube-in-tube diagrid building is introduced and assessed through pushover and incremental dynamic analyses. The main objectives of this paper are to find the optimum angle of interior and exterior diagrid tube and evaluate the efficiency of diagrid core on the probability of collapse comparing to the conventional diagrid system. Finally, the seismic performance factors of the proposed system are validated according to the FEMA P695 methodology. To achieve these, 36-story diagrid buildings with various external and internal diagonal angles are designed and then 3-D nonlinear models of these structures developed in PERFORM-3D. The results show that weight of steel material highly depends on diagonal angle of exterior tube. Adding diagrid core generally increases the over-strength factor and collapse margin ratio of tall diagrid buildings confirming high seismic safety margin for tube-in-tube diagrid buildings under severe excitations. Collapse probabilities of both structural systems under MCE records are less than 10%. Finally, response modification factor of 3.0 and over-strength factor of 2.0 and 2.5 are proposed for design of typical diagrid and tube-in-tube diagrid buildings, respectively.
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筒中网架结构倒塌评价及抗震性能因素研究
斜交网架结构作为一种较为现代的高层建筑横向抗荷载体系已被引入设计。本文介绍了一种新型的管中格网系统,并通过推覆和增量动力分析对其进行了评价。本文的主要目的是找出内外斜格筒的最佳角度,并与传统斜格系统相比,评价斜格芯对倒塌概率的影响。最后,根据FEMA P695方法对系统的抗震性能因素进行了验证。为了实现这些,设计了具有不同外部和内部对角角的36层网格建筑,然后在performer - 3d中开发了这些结构的三维非线性模型。结果表明,钢材料的重量在很大程度上取决于外管的对角角。加设斜网心总体上提高了高层斜网房的超强系数和倒塌裕度,确定了筒中筒网房在剧烈作用下具有较高的抗震安全裕度。MCE记录下两种结构体系的倒塌概率均小于10%。最后,针对典型网架和筒中网架建筑的设计,分别提出响应修正系数为3.0,过强系数为2.0和2.5。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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