近断层地震作用下高速铁路桥梁动力响应分析
发布时间：2018-08-25 14:21
【摘要】：近场地震给土木工程结构带来的严重影响早已引起广泛关注,但目前我国尚无专门针对近场地震的结构抗震设计与评估理论体系,已有研究较少考虑速度脉冲及竖向地震动响应的影响。近年来,高速铁路在我国发展迅速,近场地震作用下高速铁路桥梁结构的动力性能和地震安全已成为必须考虑的内容。本文拟对近场地震作用下的高速铁路-无砟轨道-桥梁系统的动力响应与抗震性能展开深入分析和讨论。采用ANSYS软件,将无砟轨道结构嵌入到高速铁路桥梁系统中,建立地震作用下高速高速铁路-无砟轨道-桥梁系统的全桥模型。对高速铁路-无砟轨道-桥梁系统进行弹性地震响应分析,分析地震激励、车速以及地震强度等不同参数对高速铁路-无砟轨道-桥梁系统地震响应的影响。具体研究内容包括:基于PEER NGA强震库及国内地震记录,建立近场强震动数据库。考虑采用近/远场水平及竖向多维地震动输入,建立高速铁路列车-无砟轨道—桥梁有限元精细化计算模型。分析系统地震响应,探讨脉冲及竖向地震作用效应的影响。结果表明:在高幅值长周期脉冲型地震动作用下,桥梁结构产生明显的大位移需求;随着列车运行速度的增加和地震强度的增大,高速铁路列车-无砟轨道—桥梁系统中无砟轨道结构的动力响应会增大;同时,地震作用对系统动力响应的影响要大于列车速度对系统动力响应的影响。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.13
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.13
【参考文献】
相关博士学位论文 前1条
1 王蕾;大跨度刚构桥地震响应分析及振动台试验研究[D];北京交通大学;2010年
，本文编号：2203140
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