高速鐵路橋墩抗震性能試驗與評估方法研究
發(fā)布時間：2018-10-14 14:04
【摘要】：摘要： 高速鐵路建設(shè)方興未艾,橋梁結(jié)構(gòu)作為鐵路網(wǎng)建設(shè)的重要組成部分,認識其在地震作用下的抗震性能,對于災后救援工作的開展和維修加固工作具有重要意義。本文以高速鐵路簡支梁橋橋墩為研究對象,開展了橋墩抗震性能試驗、有限元數(shù)值模擬分析、地震損傷性能分析、性能水準的定義和延性抗震能力評估方法等方面的研究,主要完成了以下工作： 1、進行了高速鐵路圓端形橋墩縮尺模型的低周反復荷載加載試驗,從破壞模式、滯回曲線、承載能力、延性性能、剛度退化效應(yīng)和殘余位移等方面,研究了剪跨比、配筋率和配箍率等參數(shù)對橋墩抗震性能的影響規(guī)律。 2、采用OpenSees進行了橋墩模型的有限元數(shù)值模擬,建立了低周反復荷載作用下的纖維單元模型,并通過試驗數(shù)據(jù)驗證了模型的有效性。 3、系統(tǒng)比較了已有的鋼筋混凝土結(jié)構(gòu)地震損傷模型,對改進的剛度退化模型、Mander-Cheng低周疲勞損傷模型和Park-Ang雙參數(shù)地震損傷模型進行了基準研究。 4、應(yīng)用混凝土壓應(yīng)變、鋼筋拉應(yīng)變和損傷指數(shù)定義了高速鐵路橋梁的性能水準,將橋梁的性能水準分為完全運營、有限運營和接近倒塌三個等級。 5、結(jié)合擬靜力試驗分析結(jié)果,對Caltrans規(guī)范和Priestley等人提出的橋墩強度計算公式進行了討論分析。 6、對高速鐵路橋墩的延性抗震能力評估方法進行了研究,并給出了具體的計算實例。
[Abstract]:Abstract: the construction of high-speed railway is in the ascendant. As an important part of railway network construction, bridge structure knows its seismic performance under earthquake. It is of great significance for the development of post-disaster rescue and maintenance and reinforcement work. In this paper, the seismic performance test of piers, finite element numerical simulation analysis, seismic damage performance analysis, the definition of performance level and the evaluation method of ductile aseismic capacity are carried out with the simple supported beam and bridge piers of high-speed railway as the research object. The main works are as follows: 1. The low cycle cyclic load loading test of circular end pier scale model of high speed railway is carried out, from failure mode, hysteresis curve, bearing capacity, ductility performance, The effects of shear span ratio, reinforcement ratio and hoop ratio on the seismic behavior of pier are studied in the aspects of stiffness degradation effect and residual displacement. 2. The finite element numerical simulation of pier model is carried out by OpenSees. The fiber element model under low cyclic loading is established, and the validity of the model is verified by experimental data. 3. The existing seismic damage models of reinforced concrete structures are compared systematically. The improved stiffness degradation model, Mander-Cheng low-cycle fatigue damage model and Park-Ang two-parameter seismic damage model are studied by reference. 4. The performance level of high-speed railway bridges is defined by using concrete compressive strain, reinforcement tension strain and damage index. The performance level of the bridge is divided into three grades: full operation, limited operation and near collapse. 5. Combined with the results of pseudostatic test, The calculation formula of pier strength proposed by Caltrans Code and Priestley et al is discussed and analyzed. 6. The evaluation method of ductility seismic capacity of bridge pier in high-speed railway is studied, and a concrete calculation example is given.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U443.22
本文編號：2270695
[Abstract]:Abstract: the construction of high-speed railway is in the ascendant. As an important part of railway network construction, bridge structure knows its seismic performance under earthquake. It is of great significance for the development of post-disaster rescue and maintenance and reinforcement work. In this paper, the seismic performance test of piers, finite element numerical simulation analysis, seismic damage performance analysis, the definition of performance level and the evaluation method of ductile aseismic capacity are carried out with the simple supported beam and bridge piers of high-speed railway as the research object. The main works are as follows: 1. The low cycle cyclic load loading test of circular end pier scale model of high speed railway is carried out, from failure mode, hysteresis curve, bearing capacity, ductility performance, The effects of shear span ratio, reinforcement ratio and hoop ratio on the seismic behavior of pier are studied in the aspects of stiffness degradation effect and residual displacement. 2. The finite element numerical simulation of pier model is carried out by OpenSees. The fiber element model under low cyclic loading is established, and the validity of the model is verified by experimental data. 3. The existing seismic damage models of reinforced concrete structures are compared systematically. The improved stiffness degradation model, Mander-Cheng low-cycle fatigue damage model and Park-Ang two-parameter seismic damage model are studied by reference. 4. The performance level of high-speed railway bridges is defined by using concrete compressive strain, reinforcement tension strain and damage index. The performance level of the bridge is divided into three grades: full operation, limited operation and near collapse. 5. Combined with the results of pseudostatic test, The calculation formula of pier strength proposed by Caltrans Code and Priestley et al is discussed and analyzed. 6. The evaluation method of ductility seismic capacity of bridge pier in high-speed railway is studied, and a concrete calculation example is given.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U443.22
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