Fragility assessment of an outrigger structure system based on energy method

IF 1.8 3区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Design of Tall and Special Buildings Pub Date : 2023-05-11 DOI:10.1002/tal.2017

M. Goodarzi, M. Moradi, Pedram Jalali, Moein Abdolmohammadi, Seyed Milad Hasheminejad

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Abstract

Fragility curves development in structures has always been a focus of research interest among structural and earthquake engineers for which the maximum story drift is usually considered as the engineering demand parameter (EDP) known as the conventional approach. This paper aims at calculating the fragility curves of a tall building with outrigger braced system by considering the plastic strain energy as the EDP and compare it with the conventional approach. In addition, the effect of optimizing the position of outriggers on the exceedance probability of the structure under near‐ and far‐fault seismic loadings is investigated in this paper. Fragility curves of this structure in four performance levels including immediate occupancy (IO), life safety (LS), collapse prevention (CP), and instability is extracted based on the conventional method. The fragility curves for the aforementioned performance levels are also extracted based on the plastic strain energy and compared with the conventional approach. The results have demonstrated that optimizing the location of the bracing system would lower the exceedance probability of the structure. Moreover, the exceedance probability of the investigated building with outrigger braced system under far‐fault records in various levels is more than that of near‐fault records. It is also concluded that the conventional approach would lead to more conservative results compared with the energy approach.

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基于能量法的支臂结构体系易损性评价

结构的易损性曲线发展一直是结构和地震工程师研究的热点，而传统方法通常将最大层间位移作为结构的工程需求参数。以塑性应变能作为EDP，计算了高层伸出臂支撑体系的易损性曲线，并与传统方法进行了比较。此外，本文还研究了在近断层和远断层地震作用下，伸出臂位置的优化对结构超越概率的影响。在常规方法的基础上，提取了该结构在即时占用(IO)、生命安全(LS)、防塌(CP)和失稳四个性能水平上的易损性曲线。基于塑性应变能提取了上述性能等级的脆性曲线，并与常规方法进行了比较。结果表明，优化支撑系统的位置可以降低结构的超限概率。此外，所研究的伸出臂支撑体系建筑在各级远故障记录下的超越概率大于近故障记录下的超越概率。与能量法相比，常规方法得到的结果更为保守。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Design of Tall and Special Buildings 工程技术-工程：土木

CiteScore

5.30

自引率

4.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Structural Design of Tall and Special Buildings provides structural engineers and contractors with a detailed written presentation of innovative structural engineering and construction practices for tall and special buildings. It also presents applied research on new materials or analysis methods that can directly benefit structural engineers involved in the design of tall and special buildings. The editor''s policy is to maintain a reasonable balance between papers from design engineers and from research workers so that the Journal will be useful to both groups. The problems in this field and their solutions are international in character and require a knowledge of several traditional disciplines and the Journal will reflect this. The main subject of the Journal is the structural design and construction of tall and special buildings. The basic definition of a tall building, in the context of the Journal audience, is a structure that is equal to or greater than 50 meters (165 feet) in height, or 14 stories or greater. A special building is one with unique architectural or structural characteristics. However, manuscripts dealing with chimneys, water towers, silos, cooling towers, and pools will generally not be considered for review. The journal will present papers on new innovative structural systems, materials and methods of analysis.