近斷層地震作用下高速鐵路橋梁動力響應(yīng)分析
發(fā)布時間：2018-08-25 14:21
【摘要】：近場地震給土木工程結(jié)構(gòu)帶來的嚴重影響早已引起廣泛關(guān)注,但目前我國尚無專門針對近場地震的結(jié)構(gòu)抗震設(shè)計與評估理論體系,已有研究較少考慮速度脈沖及豎向地震動響應(yīng)的影響。近年來,高速鐵路在我國發(fā)展迅速,近場地震作用下高速鐵路橋梁結(jié)構(gòu)的動力性能和地震安全已成為必須考慮的內(nèi)容。本文擬對近場地震作用下的高速鐵路-無砟軌道-橋梁系統(tǒng)的動力響應(yīng)與抗震性能展開深入分析和討論。采用ANSYS軟件,將無砟軌道結(jié)構(gòu)嵌入到高速鐵路橋梁系統(tǒng)中,建立地震作用下高速高速鐵路-無砟軌道-橋梁系統(tǒng)的全橋模型。對高速鐵路-無砟軌道-橋梁系統(tǒng)進行彈性地震響應(yīng)分析,分析地震激勵、車速以及地震強度等不同參數(shù)對高速鐵路-無砟軌道-橋梁系統(tǒng)地震響應(yīng)的影響。具體研究內(nèi)容包括:基于PEER NGA強震庫及國內(nèi)地震記錄,建立近場強震動數(shù)據(jù)庫�？紤]采用近/遠場水平及豎向多維地震動輸入,建立高速鐵路列車-無砟軌道—橋梁有限元精細化計算模型。分析系統(tǒng)地震響應(yīng),探討脈沖及豎向地震作用效應(yīng)的影響。結(jié)果表明:在高幅值長周期脈沖型地震動作用下,橋梁結(jié)構(gòu)產(chǎn)生明顯的大位移需求;隨著列車運行速度的增加和地震強度的增大,高速鐵路列車-無砟軌道—橋梁系統(tǒng)中無砟軌道結(jié)構(gòu)的動力響應(yīng)會增大;同時,地震作用對系統(tǒng)動力響應(yīng)的影響要大于列車速度對系統(tǒng)動力響應(yīng)的影響。
[Abstract]:The serious impact of near-field earthquakes on civil engineering structures has attracted extensive attention, but there is no theoretical system for seismic design and evaluation of structures specially for near-field earthquakes in China. The effects of velocity pulses and vertical ground motion responses have not been considered in previous studies. With the rapid development of high-speed railway in China in recent years, the dynamic performance and seismic safety of high-speed railway bridge structure under near-field earthquake have become the content that must be considered. In this paper, the dynamic response and seismic behavior of high-speed railway ballastless track bridge system under near-field earthquake are analyzed and discussed. The ballastless track structure is embedded into the high-speed railway bridge system by using ANSYS software, and the full-bridge model of high-speed railway ballastless track bridge system under earthquake action is established. The elastic seismic response of high-speed railway ballastless track bridge system is analyzed. The effects of different parameters such as earthquake excitation speed and earthquake intensity on seismic response of high-speed railway ballastless track bridge system are analyzed. The main contents are as follows: based on the PEER NGA strong earthquake database and the domestic seismic records, the near field intensity database is established. Considering the near / far field horizontal and vertical multi-dimensional ground motion input, the finite-element fine calculation model of high-speed railway train ballastless track and bridge is established. The seismic response of the system is analyzed, and the effect of pulse and vertical seismic action is discussed. The results show that under the action of high amplitude long-period pulsed ground motion, the bridge structure has obvious demand for large displacement, and with the increase of train speed and earthquake intensity, The dynamic response of ballastless track structure in high-speed railway train ballastless track and bridge system will increase and the influence of seismic action on system dynamic response is greater than that of train speed on system dynamic response.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3;U448.13
本文編號：2203140
[Abstract]:The serious impact of near-field earthquakes on civil engineering structures has attracted extensive attention, but there is no theoretical system for seismic design and evaluation of structures specially for near-field earthquakes in China. The effects of velocity pulses and vertical ground motion responses have not been considered in previous studies. With the rapid development of high-speed railway in China in recent years, the dynamic performance and seismic safety of high-speed railway bridge structure under near-field earthquake have become the content that must be considered. In this paper, the dynamic response and seismic behavior of high-speed railway ballastless track bridge system under near-field earthquake are analyzed and discussed. The ballastless track structure is embedded into the high-speed railway bridge system by using ANSYS software, and the full-bridge model of high-speed railway ballastless track bridge system under earthquake action is established. The elastic seismic response of high-speed railway ballastless track bridge system is analyzed. The effects of different parameters such as earthquake excitation speed and earthquake intensity on seismic response of high-speed railway ballastless track bridge system are analyzed. The main contents are as follows: based on the PEER NGA strong earthquake database and the domestic seismic records, the near field intensity database is established. Considering the near / far field horizontal and vertical multi-dimensional ground motion input, the finite-element fine calculation model of high-speed railway train ballastless track and bridge is established. The seismic response of the system is analyzed, and the effect of pulse and vertical seismic action is discussed. The results show that under the action of high amplitude long-period pulsed ground motion, the bridge structure has obvious demand for large displacement, and with the increase of train speed and earthquake intensity, The dynamic response of ballastless track structure in high-speed railway train ballastless track and bridge system will increase and the influence of seismic action on system dynamic response is greater than that of train speed on system dynamic response.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3;U448.13
【參考文獻】
相關(guān)博士學位論文 前1條
1 王蕾;大跨度剛構(gòu)橋地震響應(yīng)分析及振動臺試驗研究[D];北京交通大學;2010年
，本文編號：2203140
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