Seismic Performance Evaluation of Two- and Three-Story Steel Frames with an Upgraded Hybrid Buckling-Restrained Brace

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Hesam Azizi, Jamal Ahmadi
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Abstract

A novel hybrid buckling-restrained brace (HBRB) configuration is introduced in this study to address the inherent limitations of conventional buckling-restrained braced frames (BRBFs). The HBRB comprised parallel steel plates with different yield strengths, featuring a low yield point (LYP160) and high strength (SA440B). A staged yielding mechanism is intended to be achieved, whereby the LYP160 cores yield initially during minor seismic excitations while the SA440B core remains elastic, providing requisite re-centering force. The hysteretic behavior of the proposed brace was scrutinized through cyclic loading. Subsequently, pushover and incremental dynamic analyses were conducted on two- and three-story frame models incorporating various bracing configurations to assess seismic performance factors. Furthermore, Nonlinear time history analysis was employed to evaluate the efficacy of HBRBs in mitigating residual displacements. Results indicate that the HBRB exhibits enhanced post-yield stiffness and partial re-centering capacity due to its staged yielding behavior. Comparative pushover and incremental dynamic analysis revealed lower average overstrength and response modification factors for HBRB models obtained from pushover analysis (3.4 and 9.3, respectively) than the incremental dynamic analysis (4.9 and 12.1, respectively). Conversely, a slightly higher ductility reduction factor was observed in the pushover analysis (2.8) relative to incremental dynamic analysis (2.5). Eventually, nonlinear time history analysis demonstrated an average reduction of 18% and 43% in maximum and residual drift ratios for HBRB models compared to BRB models.

Abstract Image

采用升级版混合屈曲约束支撑的两层和三层钢框架的抗震性能评估
本研究引入了一种新型混合屈曲约束支撑(HBRB)结构,以解决传统屈曲约束支撑框架(BRBF)固有的局限性。HBRB 由屈服强度不同的平行钢板组成,具有低屈服点(LYP160)和高强度(SA440B)两种特性。该设计旨在实现一种分阶段屈服机制,即 LYP160 核心在轻微地震激振时首先屈服,而 SA440B 核心则保持弹性,提供必要的重新定心力。通过循环加载对拟议支撑的滞后行为进行了仔细研究。随后,对采用各种支撑配置的两层和三层框架模型进行了推移和增量动态分析,以评估抗震性能系数。此外,还采用了非线性时间历程分析来评估 HBRB 在减轻残余位移方面的功效。结果表明,HBRB 的分阶段屈服行为增强了屈服后的刚度和部分再定心能力。通过比较推移分析和增量动力分析,可以发现通过推移分析获得的 HBRB 模型的平均过强度和响应修正系数(分别为 3.4 和 9.3)低于增量动力分析(分别为 4.9 和 12.1)。相反,在推移分析中观察到的延性降低系数(2.8)略高于增量动态分析(2.5)。最后,非线性时间历程分析表明,与 BRB 模型相比,HBRB 模型的最大漂移率和残余漂移率平均分别降低了 18% 和 43%。
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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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