使用摇摆墙的软层机制的钢mrf修复后地震评估:成本-性能分析

IF 4.1 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Esmaeil Mohammadi Dehcheshmeh, Milad Hooshyar Soltan Ahmadi, Vahid Broujerdian, Abouzar Jafari
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引用次数: 0

摘要

将摇墙与抗弯矩框架(MRF)耦合是降低软层机构风险的可行和实用的解决方案。然而,很少有研究调查改造后的mrf的修复后性能和干预的成本效益。本研究进行了数值参数研究,以评估改造方法的成本效益,并阐明了改造框架的抗震性能。为此,考虑了三个钢mrf(即三层、六层和九层高度,隐含地代表低层到中层建筑),并将固定约束应用于框架柱的末端,以诱导软层机制。通过将基础摇摆墙与所检查的mrf耦合,考虑到墙的不同高度和刚度,创建了13种不同的改造方案。通过推覆和增量动力分析,对改造方案进行了风险、性能评估和地震易损性分析。对每个方案的改造成本进行了估算,并引入了绩效指标来评价改造干预的效率,然后进行了成本-绩效分析。结果表明,这种改造方法可以显著降低残余漂移,特别是在低层建筑中。在低层建筑中获得了最好的性能,并且随着建筑高度的增加,改造效率降低。增加附墙高度对降低改造情景的倒塌概率有较强的作用。此外,增加附墙高度在改善加固方案的安全性和层间漂移均匀性方面的效果比增加刚度更为显著。就性能而言,对于低层建筑而言,采用较低刚度的墙体会获得更好的效果,尽管对于中高层建筑而言,采用较长较硬的墙体的场景会大大优于其他场景。在成本效益方面,使用更短、更低硬度的管壁比其他方案要好得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Coupling a rocking wall with a moment-resisting frame (MRF) is a viable and practical solution to mitigate the risk of soft-story mechanisms. However, little research has been conducted to investigate the retrofitted MRFs’ post-repair performance and the cost-performance of intervention. This research conducted a numerical parametric study to assess the cost-effectiveness of the retrofitting approach and shed light on the seismic performance of the retrofitted frames. To this end, three steel MRFs (i.e., three-, six-, and nine-floor height implicitly representing low- to mid-rise buildings) were considered, and pinned constraints were applied to the end of frames columns to induce the soft-story mechanism. Through coupling a base-rocking wall to the examined MRFs, thirteen different retrofitted scenarios were created considering different height and stiffness for the wall. Risk and performance assessment and seismic fragility analysis of the retrofitted scenarios were conducted by performing pushover and incremental dynamic analysis. The cost of retrofitting was estimated for each scenario, and a performance index was introduced to evaluate the efficiency of retrofitting intervention and, after that, to conduct a cost-performance analysis. The results showed that the retrofitting approach considerably decreases residual drift, especially in low-rise buildings. The best performance was achieved in low-rise buildings, and the retrofitting efficiency decreased by increasing the building’s height. Increasing the attached wall’s height has a stronger effect on reducing the retrofitted scenarios’ collapse probability. Besides, increasing the height of the attached wall has a more pronounced effect than stiffness in improving the safety and inter-story drift uniformity of retrofitted scenarios. In terms of performance, for low-rise buildings, employing a less stiff wall leads to a better result, although for mid-rise buildings, scenarios with longer and stiffer wall greatly outperform others. In terms of cost-effectiveness, using a shorter and less stiff wall outperforms other scenarios by a large margin.

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来源期刊
Bulletin of Earthquake Engineering
Bulletin of Earthquake Engineering 工程技术-地球科学综合
CiteScore
8.90
自引率
19.60%
发文量
263
审稿时长
7.5 months
期刊介绍: Bulletin of Earthquake Engineering presents original, peer-reviewed papers on research related to the broad spectrum of earthquake engineering. The journal offers a forum for presentation and discussion of such matters as European damaging earthquakes, new developments in earthquake regulations, and national policies applied after major seismic events, including strengthening of existing buildings. Coverage includes seismic hazard studies and methods for mitigation of risk; earthquake source mechanism and strong motion characterization and their use for engineering applications; geological and geotechnical site conditions under earthquake excitations; cyclic behavior of soils; analysis and design of earth structures and foundations under seismic conditions; zonation and microzonation methodologies; earthquake scenarios and vulnerability assessments; earthquake codes and improvements, and much more. This is the Official Publication of the European Association for Earthquake Engineering.
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