连续刚构桥抗震性能及其主墩的损伤分析

发布时间：2018-06-11 17:00

本文选题：混凝土 + 损伤参数　；参考：《长沙理工大学》2014年硕士论文

【摘要】：近年来由于地震的频发,让我们对地震作用下结构的受力性能有了更进一步的认识,尤其是桥梁结构作为生命线工程。桥梁结构在地震作用下的损伤状况直接关系到发生地震后抗震救灾通道的打开、抗震救灾物资的运输；一旦桥梁结构损伤比较严重无法通行将会给人民生命财产带来极大的损失。所以说对以混凝土材料为主的桥梁进行损伤分析是很有必要的。本文在简述地震反应分析基本理论与损伤理论之后,以一多跨连续刚构桥为工程背景,对其进行弹塑性时程分析及其损伤分析,主要的研究内容包括：(1)论述了连续刚构桥的抗震分析方法以及抗震分析现状。对混凝土材料的损伤现象与在地震作用下的损伤机理作了较全面的介绍,讨论了目前阶段混凝土材料损伤的研究现状,并归纳了四种比较实用的损伤模型。(2)对动力损伤理论作出了详细的阐述：损伤力学中比较重要的概念损伤变量,动力损伤本构模型的理论基础、动力损伤本构关系、损伤阻尼矩阵等。(3)通过MIDAS CIVIL2012建立了某连续刚构桥的动力特性计算模型,对其做了动力特性分析,得到了某连续刚构桥前20阶的周期、频率与振型,为后续的弹塑性动力时程分析提供了数据支持。(4)通过MIDAS CIVIL2012建立了某连续刚构桥的弹塑性动力时程分析计算模型,计算了其在峰值加速度为0.5g的地震波作用下的位移、内力响应。通过弹塑性时程分析得到了桥墩在纵向地震波加载时弹性阶段和塑性阶段的内力、位移响应,横向地震波加载时弹性和塑料阶段的内力、位移响应。确定了桥梁最先进入塑性阶段的位置、时间、地震波加速度峰值以及最先发生破坏的位置、时间、地震波加速度峰值,弹塑性时程分析目的是为了与后面的损伤分析下结构内力、位移响应做数据对比。(5)对peer数据库中实验数据的分析整理,提出了混凝土材料弹性和塑性阶段的损伤参数公式,在此基础上通过ABAQUS6.12建立了桥墩的有限元模型,通过调用子程序UMAT对8#墩做损伤分析,得到损伤分析下8#墩的内力、位移响应。通过地震作用下弹塑性时程分析与损伤分析结果的比较,发现两种分析方法得到的位移、内力结果差值均在10%以内,验证了损伤参数公式的合理性。说明地震作用下该损伤参数公式可以为以后钢筋混凝土桥墩的损伤计算提供参考。
[Abstract]:Due to the frequent occurrence of earthquakes in recent years, it has made us more aware of the mechanical properties of structures under the earthquake, especially the bridge structure as a lifeline engineering. The damage condition of the bridge structure under the earthquake action is directly related to the opening of the earthquake relief channel after the earthquake, the transportation of materials for earthquake relief, and the bridge junction. The damage to the life and property of the people will be greatly lost. Therefore, it is necessary to analyze the damage of the bridges which are mainly concrete. After describing the basic theory and the damage theory of the seismic response analysis, this paper takes a multi span continuous rigid frame bridge as the engineering background and carries out its elastoplastic behavior. The main contents are as follows: (1) the seismic analysis method and the current situation of seismic analysis of continuous rigid frame bridge are discussed. The damage phenomenon of concrete material and the damage mechanism under the earthquake action are introduced, and the research status of the damage of concrete material at the present stage is discussed, and four is summarized. A more practical damage model. (2) the dynamic damage theory is described in detail: the most important conceptual damage variables in the damage mechanics, the theoretical foundation of the dynamic damage constitutive model, the dynamic damage constitutive relation, the damage damping matrix, etc. (3) the dynamic characteristic calculation model of a continuous rigid frame bridge is established by MIDAS. In this paper, the dynamic characteristics of a continuous rigid frame bridge are analyzed. The 20 steps of a continuous rigid frame bridge, frequency and mode are obtained, which provide data support for the subsequent elastoplastic dynamic time history analysis. (4) the elastic plastic dynamic time history analysis model of a continuous rigid frame bridge is established by MIDAS CIVIL2012, and its seismic wave at the peak acceleration of 0.5g is calculated. By the elastoplastic time history analysis, the internal force, displacement response, internal force and displacement response in the elastic and plastic stages of the bridge pier are obtained by elastoplastic time history analysis. The position, time and peak acceleration of seismic wave acceleration in the most advanced stage of the bridge are determined. And the first occurrence of damage position, time, seismic wave acceleration peak, elastoplastic time history analysis is designed to compare with the structural internal force and displacement response under the damage analysis. (5) analysis and arrangement of experimental data in the peer database, and put forward the damage parameter formula of the elastic and plastic stage of the concrete material, on the basis of this The finite element model of the pier is established by ABAQUS6.12, and the damage analysis of the 8# piers is analyzed by calling the subroutine UMAT, and the internal force and displacement response of the 8# pier under the damage analysis are obtained. By comparing the elastoplastic time history analysis and the damage analysis results under the earthquake action, the displacement of the two analytical methods and the difference of the internal force results are found to be within 10%. The rationality of the formula of damage parameters is proved, which shows that the formula of damage parameters can provide reference for damage calculation of reinforced concrete piers in the future.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.23

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