Investigating the behavior of an innovative butterfly‐shaped damper: An experimental and numerical study

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

Structural Design of Tall and Special Buildings Pub Date : 2023-07-31 DOI:10.1002/tal.2042

Chung Nguyen Van, A. Ghamari

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Abstract

The concentrically braced frame (CBF) suffered from low dissipating energy capacity although it pertains to a high lateral elastic stiffness and ultimate strength. To overcome the shortcoming, in this paper, an innovative damper made of two butterfly‐shaped plates installed at the end of the diagonal member of the CBF was considered experimentally and numerically. Also, the required equations were presented to design the system. In an experimental study, the damper showed stable hysteresis loops without any degradation in stiffness and strength up to a rotation of 12% (0.12 rad). This rotation capacity is 50% greater than the AISC limitation. Also, the numerical study indicated that by increasing the angle of main plates, the structural parameters are improved as ultimate strength (Fu), 47% to 90%; stiffness (K), 64% to 97%; energy absorption (E), 23% to 11%; and overstrength (Ω), 59% to 96%. By reduction of the damper's height, the parameters Fu, K, E, and Ω are increased by 47% to 76%, 23% to 64%, 49% to 93%, and 23% to 27%, respectively. Moreover, although the geometry of the damper affected the elastic stiffness, the stiffness in the nonlinear zone was independent of the geometry of the damper. Correspondingly, the slenderness limitations were suggested as 15 for height to thickness ratio and 22 for wide to thickness ratio.

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研究一种新型蝶形阻尼器的性能：实验和数值研究

同心支撑框架虽然具有较高的横向弹性刚度和极限强度，但其耗能能力较低。为了克服这一缺点，本文通过实验和数值方法研究了一种新型阻尼器，该阻尼器由两个蝶形板组成，安装在CBF对角线构件的末端。并给出了系统设计所需的方程。在一项实验研究中，阻尼器在旋转12% (0.12 rad)时显示出稳定的磁滞回线，而刚度和强度没有任何下降。这种旋转能力比AISC的限制大50%。数值研究表明，增大主板倾角可使结构参数得到改善:极限强度Fu提高47% ~ 90%;刚度(K)， 64% ~ 97%;能量吸收(E)， 23% ~ 11%;过度强度(Ω)， 59%到96%。通过降低阻尼器高度，参数Fu、K、E和Ω分别提高47% ~ 76%、23% ~ 64%、49% ~ 93%和23% ~ 27%。此外，虽然阻尼器的几何形状影响弹性刚度，但非线性区的刚度与阻尼器的几何形状无关。相应的，长细限值建议为高厚比15，宽厚比22。

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.