基于响应面模型的城市单体桥梁与桥网地震易损性评估

发布时间：2018-06-19 11:40

本文选题：易损性分析 + 响应面模型　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：针对目前我国在城市桥梁网络震害预测方面研究尚不充分,在城市桥梁生命线系统抗震救灾能力评估方面存在的局限性,本文旨在通过基于概率易损性的桥梁网络地震响应分析和易损性评估模型,实现桥梁单体精细化评估与桥梁网络整体快速评估相结合的灾害模拟评估系统,为震后通行能力评价与应急修复提供分析方法和策略支持。为研究桥梁单体和桥梁网络的地震易损性,本文从曲线桥梁参数化有限元建模入手,基于Plackett-Burman试验设计筛选得到影响桥梁结构地震响应的重要性参数,利用中心复合设计理论和响应面模型研究桥梁结构的地震损伤指标,采用宽界限法和串并联理论分别研究了单体桥梁和桥梁网络的地震易损性分析方法。具体的研究内容如下:(1)基于Matlab和OpenSees软件,编写钢筋混凝土曲线简支梁桥的参数化建模程序并进行地震响应分析,分析了墩柱构件的弯矩曲率响应和滞回特性,研究了地震动攻角对钢筋混凝土曲线简支梁桥的影响规律,并根据桥梁构件特点确定桥梁地震损伤指标和各破坏状态的损伤指标临界值。(2)采用Plackett-Burman试验设计研究桥梁结构尺寸、材料参数对桥梁结构地震响应的影响大小及规律,利用中心复合设计建立损伤指标平均值和标准差的响应面模型(即地震损伤预测函数)并验证其正确性;基于响应面法,研究参数变化对桥梁结构基本特征周期的规律,研究建立桥梁支座和墩柱的易损性曲线,并对比分析各参数对地震易损性的影响规律。(3)基于宽界限法研究建立单体桥梁地震整体易损性曲线,以某县主要交通网络为例,根据该桥梁网络的基本特征进行分类,推导不同类型桥梁网络的地震易损性计算公式,建立桥梁网络的易损性曲线;进一步建立单桥与桥梁网络的震后通行能力曲线并划分通行状态,建立概率易损性与抗震救灾决策之间的联系。
[Abstract]:At present, the research on earthquake disaster prediction of urban bridge network in our country is not enough, and the limitation in the evaluation of earthquake relief ability of urban bridge lifeline system. Through the seismic response analysis and vulnerability assessment model of bridge network based on probabilistic vulnerability, this paper aims to realize the disaster simulation evaluation system which combines the detailed evaluation of bridge unit with the rapid assessment of bridge network as a whole. To provide analysis method and strategy support for post-earthquake capacity evaluation and emergency restoration. In order to study the seismic vulnerability of single bridge and bridge network, this paper starts with parametric finite element modeling of curved bridge, and selects the important parameters that affect the seismic response of bridge structure based on Plackett-Burman test design. The seismic damage index of bridge structure is studied by using the central composite design theory and response surface model. The seismic vulnerability analysis method of single bridge and bridge network is studied by using wide bound method and series-parallel theory respectively. The concrete research contents are as follows: (1) based on Matlab and OpenSees software, the parameterized modeling program of reinforced concrete curved simply supported beam bridge is compiled and the seismic response is analyzed, and the moment curvature response and hysteretic characteristics of the pier members are analyzed. The influence of the angle of attack of ground motion on the reinforced concrete curved simply supported beam bridge is studied. According to the characteristics of the bridge members, the earthquake damage index of the bridge and the critical value of the damage index of each failure state are determined.) Plackett-Burman test is used to design and study the structure size of the bridge. The influence of material parameters on the seismic response of bridge structure is studied. The response surface model of average value and standard deviation of damage index (i.e. earthquake damage prediction function) is established by using the central composite design, and its correctness is verified based on the response surface method. In this paper, the regularity of the basic characteristic period of bridge structure by parameter change is studied, and the vulnerability curve of bridge support and pier column is established. The seismic vulnerability curve of single bridge is established based on the wide bound method. Taking the main traffic network of a county as an example, the basic characteristics of the bridge network are classified. The formulas for calculating seismic vulnerability of different types of bridge networks are derived, and the vulnerability curves of bridge networks are established, and the post-earthquake capacity curves of single bridge and bridge networks are further established and the traffic states are divided. The relationship between probability vulnerability and earthquake relief decision is established.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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