高速铁路大跨度预应力混凝土连续梁桥易损性分析
发布时间：2018-11-15 22:09
【摘要】：近年来,世界地震频发,几次大的地震都造成了严重的损失。基于性能的地震研究越来越受到重视。地震危险性分析、地震需求分析、结构抗震能力分析、损失评估和决策构成了基于性能的地震研究基本框架,其中易损性分析是整个过程中的关键,其分析的正确与否关系到整个分析过程的准确性。目前我国在地震易损性分析方面研究工作主要集中于房屋结构和公路桥梁,在铁路桥梁中相关研究仍非常缺乏,尤其是在高速铁路大跨度预应力混凝土连续梁桥研究方面几乎是一片空白。本文以中国铁路总公司科技研究开发计划课题为依托,以一座典型的高速铁路大跨连续梁桥作为研究对象,基于IDA分析方法,对其进行易损性分析,建立了该桥的易损性曲线。本文主要内容如下：1)查阅相关文献,总结了桥梁地震易损性分析的基本方法,详细阐述了增量动力分析(IDA)的基本框架和流程；2)以实际工程为例,分别建立了考虑和不考虑高速铁路桥上轨道板系统的桥梁模型,详细介绍了非线性模型建立的过程；3)以计算模型为基础,以材料的应力、应变为根据,确定了桥梁桥墩的损伤指标,进一步确定了各个损伤状态的极限状态。4)根据场地类型和结构自振特性,选取了20条地震波记录,基于IDA分析方法,建立了两种模型的易损性曲线,得出了轨道板系统对桥梁抗震性能的影响规律：轨道板系统改变了桥梁的动力性能,减小了桥梁的地震响应提高了桥梁的抗震性能。5)根据是否考虑构件损伤的相关性分别绘制了结构的整体易损性曲线；并简要探讨考虑知识不确定性对易损性曲线的影响规律。
[Abstract]:In recent years, the frequent occurrence of earthquakes in the world, several large earthquakes have caused serious losses. More and more attention has been paid to performance-based seismic research. Seismic risk analysis, seismic demand analysis, structural seismic capacity analysis, loss assessment and decision-making constitute the basic framework of performance-based seismic research, in which vulnerability analysis is the key in the whole process. Whether the analysis is correct or not is related to the accuracy of the whole analysis process. At present, the research work of earthquake vulnerability analysis in our country is mainly focused on the building structure and highway bridges, and the related research in railway bridges is still very scarce. Especially in high-speed railway long-span prestressed concrete continuous beam bridge research is almost a blank. In this paper, based on the research and development project of China Railway Corporation, a typical long-span continuous beam bridge of high-speed railway is taken as the research object. Based on the IDA analysis method, the vulnerability curve of the bridge is established. The main contents of this paper are as follows: 1) the basic methods of seismic vulnerability analysis of bridges are summarized, and the basic frame and flow of incremental dynamic analysis (IDA) are described in detail. 2) taking the actual project as an example, the bridge model considering and not considering the track slab system on the high-speed railway bridge is established, and the process of the nonlinear model establishment is introduced in detail. 3) based on the calculation model and the stress and strain of the material, the damage index of bridge pier is determined, and the limit state of each damage state is further determined. 4) according to the site type and the natural vibration characteristic of the structure, the damage index of bridge pier is determined. In this paper, 20 seismic wave records are selected. Based on the IDA analysis method, the vulnerability curves of two models are established, and the influence of the track slab system on the seismic performance of the bridge is obtained: the dynamic performance of the bridge is changed by the track slab system. The seismic response of the bridge is reduced and the seismic performance of the bridge is improved. The influence of knowledge uncertainty on vulnerability curve is discussed briefly.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
本文编号：2334536
[Abstract]:In recent years, the frequent occurrence of earthquakes in the world, several large earthquakes have caused serious losses. More and more attention has been paid to performance-based seismic research. Seismic risk analysis, seismic demand analysis, structural seismic capacity analysis, loss assessment and decision-making constitute the basic framework of performance-based seismic research, in which vulnerability analysis is the key in the whole process. Whether the analysis is correct or not is related to the accuracy of the whole analysis process. At present, the research work of earthquake vulnerability analysis in our country is mainly focused on the building structure and highway bridges, and the related research in railway bridges is still very scarce. Especially in high-speed railway long-span prestressed concrete continuous beam bridge research is almost a blank. In this paper, based on the research and development project of China Railway Corporation, a typical long-span continuous beam bridge of high-speed railway is taken as the research object. Based on the IDA analysis method, the vulnerability curve of the bridge is established. The main contents of this paper are as follows: 1) the basic methods of seismic vulnerability analysis of bridges are summarized, and the basic frame and flow of incremental dynamic analysis (IDA) are described in detail. 2) taking the actual project as an example, the bridge model considering and not considering the track slab system on the high-speed railway bridge is established, and the process of the nonlinear model establishment is introduced in detail. 3) based on the calculation model and the stress and strain of the material, the damage index of bridge pier is determined, and the limit state of each damage state is further determined. 4) according to the site type and the natural vibration characteristic of the structure, the damage index of bridge pier is determined. In this paper, 20 seismic wave records are selected. Based on the IDA analysis method, the vulnerability curves of two models are established, and the influence of the track slab system on the seismic performance of the bridge is obtained: the dynamic performance of the bridge is changed by the track slab system. The seismic response of the bridge is reduced and the seismic performance of the bridge is improved. The influence of knowledge uncertainty on vulnerability curve is discussed briefly.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
【参考文献】
相关期刊论文 前1条
1 汪梦甫;曹秀娟;孙文林;;增量动力分析方法的改进及其在高层混合结构地震危害性评估中的应用[J];工程抗震与加固改造;2010年01期
，本文编号：2334536
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