端部节间构造对特殊桁架式钢框架地震易损性影响评估

Evaluation of the influence of end segment details on the seismic fragility curves of special truss moment frames

摘要

为研究端部节间构造对特殊桁架式钢框架结构(special truss moment frame, STMF)在远场、近场地震作用下易损性能的影响,设计了3个端部节间分别采用传统斜撑式、耗能段式和环形开洞耗能钢板式的4层STMF算例,并考虑钢材力学性能的随机性,构建了120个STMF结构算例的样本库。通过引入材料随机性,改进了传统基于增量动力分析(incremental dynamic analysis, IDA)构建地震易损性曲线方法,建立了3种不同端部节间STMF结构在不同性态水平下的地震易损性曲线。结果表明,在远场地震作用下,3种类型STMF结构在多遇地震水准达到立即使用(immediate occupancy, IO)状态的超越概率为3.19%~9.96%,罕遇地震水准下达到生命安全(life safety, LS)状态的超越概率为0.11%~4.44%,均低于10%;在近场地震作用下,3种类型STMF结构对应于多遇地震水准达到IO状态的超越概率为6.85%~11.22%,罕遇地震水准下达到LS状态的超越概率为9.50%~11.49%。不同端部节间构造对STMF结构的地震易损性能影响显著,且3种类型STMF结构在近场地震作用下的超越概率均大于其在远场地震作用下的超越概率。

Abstract

To investigate the influence of end details on the seismic vulnerability of special truss moment frames (STMF) under far-field and near-field earthquakes, three benchmark examples of four-story STMF with different end details, including traditional diagonal brace, energy dissipation segment, and circular energy-dissipating steel plate, were designed. Considering the randomness of steel mechanical properties, a sample library of 120 STMF cases was constructed. By introducing material randomness, the traditional incremental dynamic analysis (IDA) approach for constructing seismic fragility curves was improved, and the seismic fragility curves of three types of STMF structures at different performance levels were established. The analytical results show that under far-field earthquakes, the exceedance probabilities of three STMF structures reaching immediate occupancy (IO) state at frequent earthquake level range from 3.19% to 9.96%, and those reaching life safety (LS) state at rare earthquake level are between 0.11% and 4.44%, all below 10%. Under near-field earthquakes, the exceedance probabilities of three STMF structures reaching IO state at frequent earthquake level range from 6.85% to 11.22%, and those reaching LS state at rare earthquake level are between 9.50% and 11.49%. Different end details have significant effect on the seismic fragility curves of STMF structures. The exceedance probabilities of three types of STMF structures under near-field earthquakes are all larger than those under far-field earthquakes.

关键词

特殊桁架式钢框架 / 材料随机性 / 增量动力时程分析 / 地震易损性

Key words

special truss moment frame / material randomness / incremental dynamic analysis / seismic fragility

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基金资助

国家自然科学基金项目(51578355)

国家自然科学基金项目(52378173)

江苏省自然科学基金项目(BK20231343)