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【目的】为研究渡槽结构的抗震韧性，基于OpenSees,针对南水北调工程中某梁式渡槽建立了有限元分析模型，考虑地震动、结构参数等因素的不确定性，对渡槽的双柱槽墩、盖梁处板式橡胶支座以及槽台处聚四氟滑板支座进行了渡槽构件的地震易损性分析。【方法】采用条件边缘乘积法建立渡槽结构系统的地震易损性曲线，计算了渡槽结构系统和构件的抗震韧性。【结果】采用改进条件边缘乘积法的渡槽结构系统，相较于单一构件，展现出更低的抗震韧性；渡槽两种支座的抗震性能较差，相较于槽墩更易受损；双柱槽墩的抗震韧性最佳，盖梁处板式橡胶支座的次之，结构系统的最差；基于槽墩单一构件来评价结构系统的抗震韧性最多可高估66.8%。对抗震性能分析显示：地震峰值加速度在0.2g～0.6g范围内时，渡槽结构系统的抗震韧性会大幅下降；当地震峰值加速度超过0.4g,渡槽结构的抗震韧性可降至0.6以下，显示出较弱的抗震性能。【结论】对于抗震设防烈度8度以上的地震高烈度地区，需关注渡槽结构的安全。
Abstract：【Objective】To explore the seismic resilience of aqueduct structures, this study develops a finite element analysis model for a beam-type aqueduct from the South-to-North Water Diversion Project based on OpenSees. Taking into account the uncertainties associated with ground motions and structural parameters, seismic vulnerability analysis is conducted on key components, such as double-column piers, elastomeric bearings at the cap beam, and polytetrafluoroethylene sliding bearings at the abutments. 【Methods】 The conditional marginal product method was employed to construct seismic vulnerability curves for the aqueduct structural system. The seismic resilience of the aqueduct structural system and its components was quantified. 【Results】 The aqueduct structural system, assessed using the improved conditional marginal product method, exhibited lower resilience compared to individual components. Among components, bearings demonstrated poorer seismic performance and higher vulnerability than piers. The double-column piers showed the highest resilience, followed by the elastomeric bearings at the cap beam, while the structural system exhibited the lowest resilience. Evaluating the seismic resilience of the structural system solely based on piers could overestimate the seismic resilience by up to 66.8%. Seismic performance analysis revealed that when peak ground acceleration(PGA) was within the range of 0.2g-0.6g, the seismic resilience of the aqueduct structural system declined significantly. When the PGA exceeded 0.4g, the seismic resilience of the aqueduct structure dropped below 0.6, indicating weak seismic performance. 【Conclusion】 Special attention should be paid to the seismic safety of aqueduct structures in regions with the seismic fortification intensity above 8 degrees.
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基本信息:
DOI：10.19760/j.ncwu.zk.2025061
中图分类号:TV672.3;TV312
引用信息:
[1]张天宇,李嘉博,黄海燕等.基于易损性的渡槽结构系统抗震韧性评价[J].华北水利水电大学学报(自然科学版),2025,46(04):92-102.DOI:10.19760/j.ncwu.zk.2025061.
基金信息:
国家自然科学基金项目(52478563); 云南水利水电职业学院基金项目(2025YSZSYS002); 中国地震局建筑物破坏机理与防御重点实验室开放基金项目(FZ211102)