【摘要】：摘要：高速鐵路橋梁作為生命線工程,一旦在地震中發(fā)生破壞,將會(huì)造成震后交通網(wǎng)絡(luò)中斷,加重次生災(zāi)害。根據(jù)大量震后橋梁破壞形式統(tǒng)計(jì),橋梁震害的主要表現(xiàn)形式為橋墩破壞導(dǎo)致橋梁整體失效甚至傾覆倒塌。由此可見,橋墩構(gòu)件的抗震性能影響著整個(gè)橋梁結(jié)構(gòu)的抗震性能,研究橋墩構(gòu)件的地震響應(yīng)特性至關(guān)重要。目前國(guó)內(nèi)外有關(guān)橋墩抗震性能的試驗(yàn)和理論研究大多以公路橋墩為原型,專門針對(duì)高速鐵路圓端形橋墩的抗震研究很少,相關(guān)的振動(dòng)臺(tái)試驗(yàn)研究資料更是極度缺乏,因此亟需進(jìn)行大量關(guān)于高速鐵路橋墩的試驗(yàn)研究和理論分析。本文以目前高速鐵路橋梁中常見的圓端形實(shí)心橋墩為原型,通過(guò)振動(dòng)臺(tái)試驗(yàn)進(jìn)行抗震性能研究,并利用有限元軟件對(duì)橋墩模型進(jìn)行數(shù)值分析,具體研究?jī)?nèi)容如下： (1)按照相似原理,設(shè)計(jì)了高速鐵路圓端形實(shí)心橋墩模型,對(duì)橋墩模型分別進(jìn)行單向、多維地震破壞模擬的振動(dòng)臺(tái)試驗(yàn),分析了橋墩在不同地震烈度下的動(dòng)力特性、加速度響應(yīng)、損傷破壞過(guò)程和裂縫發(fā)展規(guī)律。通過(guò)大型有限元分析軟件ABAQUS,建立橋墩試件的精細(xì)仿真模型,將有限元分析結(jié)果和試驗(yàn)結(jié)果對(duì)比,相互驗(yàn)證有限元分析方法和試驗(yàn)方法的正確性。 (2)以模型橋墩為研究對(duì)象,應(yīng)用ABAQUS有限元軟件建立不同剪跨比下的橋墩三維實(shí)體模型,分別考慮水平地震和水平與豎向地震共同作用下,在不同地震烈度區(qū)橋墩構(gòu)件的受力、變形狀態(tài)以及整體抗震性能。通過(guò)對(duì)比深入分析剪跨比對(duì)橋墩抗震性能和損傷機(jī)理的影響。同時(shí)研究考慮豎向地震作用后橋墩構(gòu)件的受力及變形狀態(tài)的變化規(guī)律,分析各烈度區(qū)橋墩的地震反應(yīng),研究豎向地震對(duì)橋墩破壞模式和抗震性能的影響。 (3)通過(guò)對(duì)小剪跨比橋墩輸入不同組合的水平雙向地震荷載,分析其在不同荷載組合條件下的地震反應(yīng),研究地震組合效應(yīng)對(duì)小剪跨比橋墩抗震性能的影響。
[Abstract]:Absrtact: as a lifeline project, the high-speed railway bridge will break down the traffic network and aggravate the secondary disaster once it is destroyed in the earthquake. According to the statistics of a large number of post-earthquake damage forms of bridges, the main form of bridge damage is the failure of bridge piers and the collapse of the whole bridge. It can be seen that the seismic behavior of pier members affects the seismic performance of the whole bridge structure, so it is very important to study the seismic response characteristics of pier members. At present, most of the experimental and theoretical studies on the seismic performance of piers at home and abroad are based on highway piers, but there are few seismic studies on circular end piers of high-speed railway, and the related experimental data of shaking table are extremely lacking. Therefore, a great deal of experimental research and theoretical analysis on high-speed railway piers are urgently needed. In this paper, the seismic behavior of round end solid pier, which is common in high-speed railway bridge, is studied by shaking table test, and the pier model is analyzed numerically by finite element software. The specific research contents are as follows: (1) according to the principle of similarity, the model of round end shaped solid pier of high-speed railway is designed, and the shaking table test of unidirectional and multidimensional seismic damage simulation is carried out on the model of bridge pier. The dynamic characteristics, acceleration response, damage failure process and crack development law of pier under different earthquake intensity are analyzed. The fine simulation model of the bridge pier specimen is established by the large-scale finite element analysis software ABAQUS,. The correctness of the finite element analysis method and the test method is verified by comparing the finite element analysis results with the test results. (2) taking the model pier as the research object, using the ABAQUS finite element software to establish the three-dimensional solid model of the pier under different shear span ratio, considering the horizontal earthquake and the horizontal and vertical earthquake together, respectively. Stress, deformation and overall seismic behavior of pier members in different seismic intensity areas. The effect of shear span ratio on seismic behavior and damage mechanism of pier is analyzed. At the same time, the variation law of the stress and deformation state of the pier members after considering the vertical earthquake is studied, and the seismic response of the pier in various intensity areas is analyzed, and the influence of the vertical earthquake on the failure mode and seismic performance of the pier is studied. (3) by inputting different combinations of horizontal and bidirectional seismic loads to small shear span ratio piers, the seismic response under different load combinations is analyzed, and the effect of seismic combination effect on the seismic behavior of small shear span ratio piers is studied.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.13;U442.55

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本文編號(hào)：2299056