基于多元模糊评定的桥梁综合地震易损性分析

发布时间：2018-01-13 08:23

本文关键词：基于多元模糊评定的桥梁综合地震易损性分析　出处：《振动工程学报》2017年02期 　论文类型：期刊论文

【摘要】：传统的钢筋混凝土桥梁地震易损性分析一般只根据主要桥墩的截面曲率等参数进行评估,对桥梁动力特性演变和整体性能考虑不充分。阐述了通过对桥梁不同部位进行易损性分析进而实现综合损伤评定的策略。从能量耗散角度论证损伤的形式和程度与结构理想弹性变形能和实际弹塑性变形能之间的差异相关,建立基于滞回耗能差的桥墩损伤评价模型。提出基于多阶周期的桥梁多维整体易损性分析方法。运用模糊数学中的综合评判方法,结合基于位移的支座损伤分析、基于能量的桥墩损伤分析和基于周期的整体损伤分析,建立了能够反映桥梁从细部到整体多层次损伤的多元模糊易损性分析方法。对算例桥梁进行多维增量动力分析和各级别的易损性分析,结果表明:基于多元模糊评定的桥梁地震易损性分析方法能准确细致地反映桥梁构件和整体的动力特性的损伤演变过程,具有较好的准确性和实用性。
[Abstract]:The traditional seismic vulnerability analysis of reinforced concrete bridges is generally based on the parameters such as the sectional curvature of the main piers. The evolution of the dynamic characteristics and the overall performance of the bridge are not sufficiently considered. The strategy of comprehensive damage assessment by analyzing the vulnerability of different parts of the bridge is expounded. The form and extent of the damage are demonstrated from the point of view of energy dissipation. It is related to the difference between the ideal elastic deformation energy and the actual elastoplastic deformation energy of the structure. The damage evaluation model of bridge pier based on hysteretic energy difference is established. The multi-dimensional global vulnerability analysis method based on multi-order period is proposed. The comprehensive evaluation method in fuzzy mathematics is used. Combined with displacement-based support damage analysis, energy-based pier damage analysis and period based global damage analysis. The multivariate fuzzy vulnerability analysis method which can reflect the multi-level damage of bridge from detail to whole is established. The multi-dimensional incremental dynamic analysis and vulnerability analysis of each grade of bridge are carried out. The results show that the seismic vulnerability analysis method based on multivariate fuzzy evaluation can accurately and meticulously reflect the damage evolution process of the dynamic characteristics of the bridge members and the whole structure, and has good accuracy and practicability.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中国建筑科学研究院建筑工程检测中心;
【基金】：国家自然科学基金资助项目(51478024)
【分类号】：U442.55
【正文快照】： 引言桥梁是交通生命线工程的重要环节,在以往的震害中,桥梁常常出现落梁、桥墩弯曲损伤和支座失效等局部破坏甚至整体严重倒塌,从而延误抗震救援工作的开展,加剧人员伤亡与经济损失[1]。近年来,随着非线性有限元分析方法的迅猛发展和基于性能的桥梁抗震设计思想和理论框架的不

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