摘要
地震会导致重大的经济损失及人员伤亡,对混凝土桥梁造成的损失易较为严重,因此,开展混凝土桥梁地震灾害损失评估的研究具有重要的现实意义。传统评估方法主要用于变量衡量混凝土桥梁结构在主余震作用下,混凝土桥梁的响应和性态水平,但忽略了余震作用对混凝土桥梁的影响,导致对地震灾害损失评估耗时大、不准确的问题。在主余震作用下,提出基于地震灾害损失分解的混凝土桥梁地震灾害损失评估方法。采用非线性动力分析确定易损性函数,得到易损性曲线图的基础上,基于参数对数正态分布模型,分析混凝土桥梁概率地震需求;以经济损失及人口损失为指标,进行分解评估的基础上,建立混凝土桥梁地震灾害损失评估模型,达到评估混凝土桥梁地震灾害损失的目的。实验结果表明:采用改进方法进行混凝土桥梁地震损伤评估时,其评估误差率要优于传统方法,评估结果更加接近实际情况,具有一定的优势。
The earthquake will cause significant economic losses and casualties, and the damage to the concrete bridge is more serious. Therefore, it is of great practical significance to carry out the research on the loss assessment of the earthquake disaster of the concrete bridge. The traditional evaluation method mainly uses the easily accepted variables to measure the response and state level of the concrete bridge structure under mainshock and aftershocks. However, the effect of aftershocks on concrete bridge is ignored, which leads to the time-consuming and inaccurate problem during the earthquake disaster loss assessment. Under the effect of the main aftershock, the paper proposes the seismic disaster loss assessment method for concrete bridge based on the decomposition of earthquake disaster loss. The paper determines the vulnerability function by using nonlinear dynamic analysis, and analyzes the probabilistic seismic demand of concrete bridges basing on the vulnerabilitycurve and the parameter lognormal distribution model. Taking the economic loss and population loss as indicators,and based on the decomposition assessment, the paper establishes the concrete bridge seismic disaster assessment model to assess the concrete bridge seismic disaster loss. The experimental results show that the evaluation error rate of the improved method is better than that of the traditional method, and the evaluation result is closer to the actual situation, and has certain advantages.
作者
陆进保
LU Jinbao(College of Applied Engineering,Urumqi vocational university,Urumqi 830002,China)
出处
《华南地震》
2018年第2期29-34,共6页
South China Journal of Seismology
关键词
主余震
混凝土桥梁
地震
灾害
损失
评估
Main aftershock
Concrete bridge
Earthquake
Disaster
Loss
Evaluation
