高速铁路大跨度钢管混凝土拱桥地震响应分析
发布时间：2018-08-13 09:31
【摘要】：在我国高速铁路和山区铁路高速发展的今天,钢管混凝土拱桥由于具有跨越能力大、梁高低、造型美观等优点,正不断得到应用。广西沿海高速铁路是广西第一条运营的高速铁路,速度目标值：250km/h,钦江铁路特大桥是其中的控制工程,主桥采用2×128m下承式简支钢管混凝土系杆拱,系梁采用预应力钢筋混凝土箱梁,拱上结构为钢管混凝土。我国西南山区是地震频发地区,为了在地震发生时降低控制工程的损害,保持整条铁路的通畅运行,对钦江铁路特大桥进行地震分析是非常有必要和具有重要意义的。本文从钢管混凝土结构的发展历程着手,分析桥梁震害形式,并且系统的介绍拱桥动力学原理和桥梁抗震的分析方法,选取钦江铁路特大桥工程实例,利用大型有限元软件Midas/civil建立三维空间模型,分析高速铁路大跨度钢管混凝土拱桥的动力性能,主要进行了以下工作：(1)钢管混凝土拱桥的模型建立。本文利用有限元软件Midas/civil,采用等效截面法模拟哑铃型截面,建立比较精确的三维空间模型。(2)钢管混凝土拱桥自振特性分析。在建立合理空间模型基础上,使用多重Ritz向量法进行自振特性分析,并对结构的基频和振型进行分析。计算结果显示基频为0.518Hz,竖向自振频率为1.723 Hz,系梁挠度最大值为38mm,均满足规范要求。(3)钢管混凝土拱桥的反应谱分析。考虑桥梁实际地质条件、基本信息,选用合适的反应谱函数,采用完全开平方(CQC)法进行分析计算,并对结构典型截面的内力和位移进行分析,表明横桥向地震荷载在抗震设计中起控制作用,建议设置横向限位装置。(4)钢管混凝土拱桥的动态时程分析。选择EI波、Taft波和兰州波,经过调整后分别对桥梁从横向,纵向和竖向三方向组合分析,并对结构典型截面的位移和内力进行分析,表明地震波的横向输入对结构的影响较大,提高结构的抗震能力应该通过优化横撑设置等方法对结构横向刚度进行适当加强。通过以上地震响应分析,对钦江铁路特大桥抗震设计提出一些参考建议。
[Abstract]:With the rapid development of high-speed railway and mountainous railway in our country, concrete filled steel tube arch bridge is being used continuously because of its advantages of large span ability, high and low beam, beautiful shape and so on. Guangxi coastal high speed railway is the first high speed railway in Guangxi. The speed target value is 250 km / h. The Qinjiang railway bridge is one of the control projects. The main bridge adopts 2 脳 128 m through concrete filled steel tube tie arch. Prestressed reinforced concrete box girder is used in the tie beam and concrete filled steel tube structure is used on the arch. In order to reduce the damage of the control project and keep the whole railway running smoothly, it is very necessary and significant to carry out seismic analysis of the Qinjiang railway bridge in the mountainous area of southwest China. Based on the development of concrete-filled steel tube (CFST) structure, this paper analyzes the earthquake damage form of bridge, and systematically introduces the dynamic principle of arch bridge and the seismic analysis method of bridge. Using the finite element software Midas/civil to establish the three-dimensional spatial model and analyze the dynamic performance of the long-span concrete-filled steel tube arch bridge in high-speed railway. The main work is as follows: (1) the model of the concrete filled steel tube arch bridge is established. In this paper, using the finite element software Midas / civil, the equivalent section method is used to simulate the dumbbell-shaped section, and a more accurate three-dimensional spatial model is established. (2) the natural vibration characteristics of concrete-filled steel tubular arch bridge are analyzed. On the basis of establishing a reasonable spatial model, the natural vibration characteristics of the structure are analyzed by using multiple Ritz vector method, and the fundamental frequency and mode shape of the structure are analyzed. The calculation results show that the fundamental frequency is 0.518 Hz, the vertical natural vibration frequency is 1.723 Hz, and the maximum deflection of the tie beam is 38 mm. (3) the response spectrum of concrete-filled steel tubular arch bridge is analyzed. Considering the actual geological conditions of the bridge, the basic information, choosing the appropriate response spectrum function, using the completely square (CQC) method to analyze and calculate the internal force and displacement of the typical section of the structure, the internal force and displacement of the typical section of the structure are analyzed. It is suggested that lateral limit devices should be set up. (4) dynamic time history analysis of concrete-filled steel tubular arch bridges. Selecting ei wave Taft wave and Lanzhou wave, after adjustment, the bridge is analyzed separately from transverse, longitudinal and vertical directions, and the displacement and internal force of typical section of the structure are analyzed. The results show that the transverse input of seismic wave has a great influence on the structure. In order to improve the seismic capacity of the structure, the transverse stiffness of the structure should be strengthened by optimizing the setting of transverse braces. Based on the above seismic response analysis, some suggestions for seismic design of Qinjiang Railway Bridge are put forward.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.22
本文编号：2180579
[Abstract]:With the rapid development of high-speed railway and mountainous railway in our country, concrete filled steel tube arch bridge is being used continuously because of its advantages of large span ability, high and low beam, beautiful shape and so on. Guangxi coastal high speed railway is the first high speed railway in Guangxi. The speed target value is 250 km / h. The Qinjiang railway bridge is one of the control projects. The main bridge adopts 2 脳 128 m through concrete filled steel tube tie arch. Prestressed reinforced concrete box girder is used in the tie beam and concrete filled steel tube structure is used on the arch. In order to reduce the damage of the control project and keep the whole railway running smoothly, it is very necessary and significant to carry out seismic analysis of the Qinjiang railway bridge in the mountainous area of southwest China. Based on the development of concrete-filled steel tube (CFST) structure, this paper analyzes the earthquake damage form of bridge, and systematically introduces the dynamic principle of arch bridge and the seismic analysis method of bridge. Using the finite element software Midas/civil to establish the three-dimensional spatial model and analyze the dynamic performance of the long-span concrete-filled steel tube arch bridge in high-speed railway. The main work is as follows: (1) the model of the concrete filled steel tube arch bridge is established. In this paper, using the finite element software Midas / civil, the equivalent section method is used to simulate the dumbbell-shaped section, and a more accurate three-dimensional spatial model is established. (2) the natural vibration characteristics of concrete-filled steel tubular arch bridge are analyzed. On the basis of establishing a reasonable spatial model, the natural vibration characteristics of the structure are analyzed by using multiple Ritz vector method, and the fundamental frequency and mode shape of the structure are analyzed. The calculation results show that the fundamental frequency is 0.518 Hz, the vertical natural vibration frequency is 1.723 Hz, and the maximum deflection of the tie beam is 38 mm. (3) the response spectrum of concrete-filled steel tubular arch bridge is analyzed. Considering the actual geological conditions of the bridge, the basic information, choosing the appropriate response spectrum function, using the completely square (CQC) method to analyze and calculate the internal force and displacement of the typical section of the structure, the internal force and displacement of the typical section of the structure are analyzed. It is suggested that lateral limit devices should be set up. (4) dynamic time history analysis of concrete-filled steel tubular arch bridges. Selecting ei wave Taft wave and Lanzhou wave, after adjustment, the bridge is analyzed separately from transverse, longitudinal and vertical directions, and the displacement and internal force of typical section of the structure are analyzed. The results show that the transverse input of seismic wave has a great influence on the structure. In order to improve the seismic capacity of the structure, the transverse stiffness of the structure should be strengthened by optimizing the setting of transverse braces. Based on the above seismic response analysis, some suggestions for seismic design of Qinjiang Railway Bridge are put forward.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.22
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