【摘要】 为研究结构抗倒塌储备能力对减小结构地震损失的作用,提出基于结构抗倒塌能力储备系数(CMR)的钢筋混凝土框架结构地震损失分析方法。利用IDA方法,确定结构在连续地震强度下的易损性,根据结构的破坏概率及易损性曲线计算地震经济损失。将结构抗倒塌能力指标CMR与结构在给定地震强度下的经济损失相结合,建立基于CMR的地震损失模型。对脆性及延性结构的倒塌特性和地震损失进行了系统地对比分析。通过四个RC框架结构分析,结果表明:地震损失评估与结构的CMR具有密切关系。在给定地震强度作用下,结构地震损失随CMR的增大而减小;CMR较小的结构随地震强度的增大损失增加较快,而CMR较大的结构则随地震强度的增大损失增加相对较平缓。所提出基于结构CMR地震损失评估思想可以作为量化地震损失评估较有前景的改进方法。更多还原

【Abstract】 An earthquake loss analytical methodology based on collapse margin ratio of RC frame structures was investigated to study the relationship between structure collapse resistance capacity and structural earthquake loss in this paper. Incremental dynamic analysis(IDA) was used to determine structural vulnerability under continuous earthquake intensity. Earthquake losses were estimated according to the structural damage probability using fragility curves, which were combined with the collapse margin ratio(CMR) to produce an earthquake loss model based on CMR. The differences in collapse probability curves and the earthquake loss estimates between ductile and brittle structures are identified systematically. The analytical results from four RC frames show that a close relationship between the seismic loss assessment and CMR of the structure appears to exist. The earthquake loss basically decreases with increasing CMR at a given ground motion intensity; The loss of structural integrity in structures with smaller CMR increases quickly with increasing ground motion intensity, while structural loss in structures with greater CMR increases slowly. The idea proposed herein could be regarded as a promising improvement on the quantification of earthquake loss estimates by utilizing structure CMR.更多还原