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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic reliability of steel moment resisting framed buildings retrofitted with buckling restrained braces
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Seismic reliability of steel moment resisting framed buildings retrofitted with buckling restrained braces

机译：加装屈曲约束支撑的抗弯矩钢结构房屋的地震可靠度

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摘要

The present paper investigates the seismic reliability of the application of buckling restrained braces (BRBs) for seismic retrofitting of steel moment resisting framed buildings through fragility analysis. Samples of regular three-storey and eight-storey steel moment resisting frames were designed with lateral stiffness insufficient to comply with the code drift limitations imposed for steel moment resisting frame systems in earthquake-prone regions. The frames were then retrofitted with concentrically chevron conventional braces and BRBs. To obtain robust estimators of the seismic reliability, a database including a wide range of natural earthquake ground motion records with markedly different characteristics was used in the fragility analysis. Nonlinear time history analyses were utilized to analyze the structures subjected to these earthquake records. The improvement of seismic reliability achieved through the use of conventional braces and BRBs was evaluated by comparing the fragility curves of the three-storey and eight-storey model frames before and after retrofits, considering the probabilities of four distinct damage states. Moreover, the feasibility of mitigating the seismic response of moment resisting steel structures by using conventional braces and BRBs was determined through seismic risk analysis. The results obtained indicate that both conventional braces and especially BRBs improve significantly the seismic behavior of the original building by increasing the median values of the structural fragility curves and reducing the probabilities of exceedance of each damage state.
机译：本文通过脆性分析研究了屈曲约束支撑（BRB）在抗弯矩钢结构房屋抗震加固中的抗震可靠性。常规三层和八层钢制抗弯框架的样本设计为侧向刚度不足以满足地震多发地区钢制抗弯框架系统所施加的规范漂移限制。然后用同心的V形常规支架和BRB改装框架。为了获得可靠的地震可靠性估算器，在脆弱性分析中使用了一个数据库，该数据库包含范围广泛的具有明显不同特征的自然地震地面运动记录。利用非线性时程分析来分析遭受这些地震记录的结构。通过比较改造前后三层和八层模型框架的脆性曲线，并考虑了四个不同损坏状态的可能性，评估了通过使用常规支撑和BRB所获得的地震可靠性的提高。此外，通过地震危险性分析，确定了使用常规支撑和BRB减轻抗弯钢结构地震响应的可行性。获得的结果表明，传统的支撑，尤其是BRB，都通过增加结构脆性曲线的中值并减小超出每种破坏状态的概率来显着改善原始建筑物的抗震性能。

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