Indicators of improvements in seismic performance possible through retrofit of reinforced concrete frame buildings
Indicators of improvements in seismic performance possible through retrofit of reinforced concrete frame buildings
复制标题
通过钢筋混凝土框架建筑改造可改善抗震性能的指标
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
A. Liel
中科院分区：
文献类型：
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作者：
C. Harrington;A. Liel
改造旧钢筋混凝土（RC）框架建筑物的目的是减轻这些结构的公认的地震脆弱性。然而，改造设计决策（例如，增加强度，刚度，或变形能力）对全球性能的影响尚不清楚，因为能力和脆弱性模型的改造结构是罕见的。这项研究量化的好处，改造非韧性钢筋混凝土框架的全球性能指标，如倒塌率和经济损失。共有27栋建筑物被评估。在这样做时，它随后确定结构指标，即改造系统的强度和变形特性，这是最相关的改进性能。如果所关注的性能指标是倒塌风险和生命安全，则系统强度或变形能力的增加是重要的。如果性能指标的利益是预期地震引起的维修费用或经济损失，强度为基础的指标是最有效的。一些改造可以显着提高倒塌风险，而不会减少经济损失。
Retrofitting older reinforced concrete (RC) frame buildings aims to mitigate the well-established seismic vulnerabilities of these structures. However, the impact of retrofit design decisions (e.g. increases in strength, stiffness, or deformation capacity) on global performance is unclear because capacity and fragility models for retrofit structures are rare. This study quantifies the benefits of retrofitting nonductile RC moment frames in terms of global performance metrics, such as collapse rates and economic losses. In total, 27 buildings are assessed. In doing so, it subsequently identifies structural indicators, that is, strength and deformation characteristics of the retrofit system, which are most associated with improved performance. If the performance measure of interest is collapse risk and life safety, increases to either system strength or deformation capacity are important. If the performance measure of interest is expected earthquake-induced repair costs or economic losses, strength-based indicators are most effective. Some retrofits can significantly improve collapse risk without reducing economic losses.