大跨径连续梁—连续刚构桥施工阶段抗震分析研究
发布时间：2018-11-24 11:48
【摘要】：进入21世纪以来，随着交通事业的日益发达，高等级公路建设飞速发展，桥梁朝着高耸、大跨度方向发展。大跨径连续刚构桥由于自身得天独厚的优点被设计者所青睐，得到了广泛的推广与应用。 大跨径桥梁通常位于交通主干线上，其破坏会导致巨大政治、经济损失，会对灾后救援工作造成很大影响。并且大跨径连续梁-连续刚构桥桥型新颖，震害经验少，我国《公路桥梁抗震设计细则》对单跨跨径超过150m的特大桥梁只给出抗震设计原则。从经济角度考虑，东北地区大跨径桥梁悬臂施工可以分两年施工，冬季暂停施工，目前国内很少有冬季暂停施工的大跨径桥梁，也很少有文献对大跨径连续刚构桥冬季停工阶段悬臂状态的抗震稳定性进行研究。因此，对大跨连续梁-连续刚构桥悬臂施工各阶段进行地震性能方面的研究，了解和掌握结构的抗震性能随施工过程的推进而变化的规律和特点，，以保证施工阶段桥梁结构稳定以及施工人员的安全，并且有助于完善大跨连续梁桥的抗震设计理论，进一步促进抗震设计规范的完善和发展。 本文以建设中的长白山国际旅游度假区北区桥梁工程1号桥为依托工程，从桥梁建设的实际出发，对此连续梁-连续刚构桥停工阶段及以后的悬臂施工过程进行研究，主要介绍了桥梁抗震分析的基本理论，并详细讨论了时程分析方法地震波的选择、调整、输入问题。 利用Midas/civil有限元软件建立桥梁动力仿真模型，计算桥梁结构各施工阶段的动力特性，分析各模型自振周期以及主要振型的变化规律。对桥梁从冬季停工阶段开始每一个施工阶段进行反应谱分析和时程分析，计算比较各施工阶段的主要控制截面的位移响应峰值及内力响应峰值，得出最不利的施工阶段，必要时采取措施以确保施工过程的安全。其计算结果可为今后同类桥梁的抗震设计提供参考。
[Abstract]:Since the beginning of the 21st century, with the development of transportation, the construction of high-grade highway is developing rapidly, and the bridge is developing towards the direction of high-rise and long-span. Long span continuous rigid frame bridge has been widely popularized and applied because of its unique advantages. Long-span bridges are usually located on the main traffic lines, which can cause huge political and economic losses, and will have a great impact on post-disaster relief work. Moreover, the long-span continuous beam-continuous rigid frame bridge is of novel type and less experience in earthquake damage. The aseismic design rules of highway bridges in China are given only for large bridges with a single span of more than 150m. From an economic point of view, the cantilever construction of long-span bridges in Northeast China can be divided into two years and suspended in winter. At present, there are few long-span bridges in China that are suspended in winter. There are few literatures to study the seismic stability of cantilever state of long-span continuous rigid frame bridge in winter. Therefore, the seismic performance of long-span continuous beam-continuous rigid frame bridge cantilever construction is studied in order to understand and master the regularity and characteristics of the seismic performance of the structure changing with the advance of construction process. In order to ensure the stability of the bridge structure and the safety of the constructor in the construction stage, it is helpful to perfect the seismic design theory of the long-span continuous beam bridge, and further promote the perfection and development of the seismic design code. Based on the construction of Bridge No. 1 Bridge in North District of Changbai Mountain International tourist Resort, this paper studies the suspension stage of continuous beam-continuous rigid frame bridge and the process of cantilever construction in the future, based on the actual construction of the bridge. This paper mainly introduces the basic theory of seismic analysis of bridges, and discusses in detail the selection, adjustment and input of seismic wave in time-history analysis method. The dynamic simulation model of bridge is established by using Midas/civil finite element software. The dynamic characteristics of bridge structure in each construction stage are calculated, and the natural vibration period and the variation law of main vibration modes of each model are analyzed. The response spectrum analysis and time history analysis of each construction stage of the bridge from the winter shutdown stage are carried out, and the peak value of displacement response and the internal force response of the main control sections in each construction stage are calculated and compared, and the most unfavorable construction stage is obtained. Take necessary measures to ensure the safety of the construction process. The results can be used as reference for seismic design of similar bridges in the future.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U445
本文编号：2353586
[Abstract]:Since the beginning of the 21st century, with the development of transportation, the construction of high-grade highway is developing rapidly, and the bridge is developing towards the direction of high-rise and long-span. Long span continuous rigid frame bridge has been widely popularized and applied because of its unique advantages. Long-span bridges are usually located on the main traffic lines, which can cause huge political and economic losses, and will have a great impact on post-disaster relief work. Moreover, the long-span continuous beam-continuous rigid frame bridge is of novel type and less experience in earthquake damage. The aseismic design rules of highway bridges in China are given only for large bridges with a single span of more than 150m. From an economic point of view, the cantilever construction of long-span bridges in Northeast China can be divided into two years and suspended in winter. At present, there are few long-span bridges in China that are suspended in winter. There are few literatures to study the seismic stability of cantilever state of long-span continuous rigid frame bridge in winter. Therefore, the seismic performance of long-span continuous beam-continuous rigid frame bridge cantilever construction is studied in order to understand and master the regularity and characteristics of the seismic performance of the structure changing with the advance of construction process. In order to ensure the stability of the bridge structure and the safety of the constructor in the construction stage, it is helpful to perfect the seismic design theory of the long-span continuous beam bridge, and further promote the perfection and development of the seismic design code. Based on the construction of Bridge No. 1 Bridge in North District of Changbai Mountain International tourist Resort, this paper studies the suspension stage of continuous beam-continuous rigid frame bridge and the process of cantilever construction in the future, based on the actual construction of the bridge. This paper mainly introduces the basic theory of seismic analysis of bridges, and discusses in detail the selection, adjustment and input of seismic wave in time-history analysis method. The dynamic simulation model of bridge is established by using Midas/civil finite element software. The dynamic characteristics of bridge structure in each construction stage are calculated, and the natural vibration period and the variation law of main vibration modes of each model are analyzed. The response spectrum analysis and time history analysis of each construction stage of the bridge from the winter shutdown stage are carried out, and the peak value of displacement response and the internal force response of the main control sections in each construction stage are calculated and compared, and the most unfavorable construction stage is obtained. Take necessary measures to ensure the safety of the construction process. The results can be used as reference for seismic design of similar bridges in the future.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U445
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