【摘要】：近年來,世界地震頻發(fā),幾次大的地震都造成了嚴(yán)重的損失�；谛阅艿牡卣鹧芯吭絹碓绞艿街匾�。地震危險(xiǎn)性分析、地震需求分析、結(jié)構(gòu)抗震能力分析、損失評(píng)估和決策構(gòu)成了基于性能的地震研究基本框架,其中易損性分析是整個(gè)過程中的關(guān)鍵,其分析的正確與否關(guān)系到整個(gè)分析過程的準(zhǔn)確性。目前我國(guó)在地震易損性分析方面研究工作主要集中于房屋結(jié)構(gòu)和公路橋梁,在鐵路橋梁中相關(guān)研究仍非常缺乏,尤其是在高速鐵路大跨度預(yù)應(yīng)力混凝土連續(xù)梁橋研究方面幾乎是一片空白。本文以中國(guó)鐵路總公司科技研究開發(fā)計(jì)劃課題為依托,以一座典型的高速鐵路大跨連續(xù)梁橋作為研究對(duì)象,基于IDA分析方法,對(duì)其進(jìn)行易損性分析,建立了該橋的易損性曲線。本文主要內(nèi)容如下：1)查閱相關(guān)文獻(xiàn),總結(jié)了橋梁地震易損性分析的基本方法,詳細(xì)闡述了增量動(dòng)力分析(IDA)的基本框架和流程；2)以實(shí)際工程為例,分別建立了考慮和不考慮高速鐵路橋上軌道板系統(tǒng)的橋梁模型,詳細(xì)介紹了非線性模型建立的過程；3)以計(jì)算模型為基礎(chǔ),以材料的應(yīng)力、應(yīng)變?yōu)楦鶕?jù),確定了橋梁橋墩的損傷指標(biāo),進(jìn)一步確定了各個(gè)損傷狀態(tài)的極限狀態(tài)。4)根據(jù)場(chǎng)地類型和結(jié)構(gòu)自振特性,選取了20條地震波記錄,基于IDA分析方法,建立了兩種模型的易損性曲線,得出了軌道板系統(tǒng)對(duì)橋梁抗震性能的影響規(guī)律：軌道板系統(tǒng)改變了橋梁的動(dòng)力性能,減小了橋梁的地震響應(yīng)提高了橋梁的抗震性能。5)根據(jù)是否考慮構(gòu)件損傷的相關(guān)性分別繪制了結(jié)構(gòu)的整體易損性曲線；并簡(jiǎn)要探討考慮知識(shí)不確定性對(duì)易損性曲線的影響規(guī)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.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

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本文編號(hào)：2334536