强震区独塔单索面大型斜拉桥梁结构抗震性能研究

发布时间：2018-06-18 06:42

本文选题：独塔单索面斜拉桥 + 抗震分析　；参考：《河北工业大学》2014年硕士论文

【摘要】：近年来，世界范围内地震频繁发生，对桥梁工程造成了极大的破坏，也带来了巨大的经济和人员损失。独塔单索面斜拉桥是桥梁中的一枝奇葩，在近年来的工程中备受青睐。由于其特殊的结构形式,其动力特性与普通斜拉桥有所不同，因而需要进行专门的抗震设计研究，故对此类重要桥梁动力特性和抗震性能的研究就是很有必要的。本文的研究对于大跨径斜拉桥的地震反应分析也具有一定的指导意义。本文分析了桥梁震害的类型及其产生的原因，阐述了桥梁抗震的设防目标和设计方法，依据《公路桥梁抗震设计细则》（JTG/T B02-01-2008），以曹妃甸工业区独塔单索面斜拉桥为工程背景，考虑塔、梁之间在纵向的不同连接方式，，采用反应谱法从抗震性能的角度分析，针对拉索垂度的非线性影响及桩—土—结构相互作用，采用不同等级的地震动输入，并采用ANSYS软件对该桥建立有限元模型，从而进行动力特性及抗震性能的分析。本文根据塔、梁间在纵向的不同连接方式制定方案并进行比选，从抗震性能的角度分析得出塔、梁间在纵向采用弹性连接装置对结构的抗震是有利的；对于选定的塔、梁间弹性连接方案，进行了弹簧刚度的参数分析及弹性连接体系的优化设计；弹性连接装置选择粘滞阻尼器比橡胶支承装置更具优势。通过非线性时程分析，在塔梁间纵向采用设计参数为阻尼系数C=12000和速度指数ξ=0.3的阻尼器，在所提交的P1和P2地震作用下，主塔、过渡墩、桩基均能满足性能目标的要求，结构基本是安全的。
[Abstract]:In recent years, earthquakes occur frequently in the world, causing great damage to bridge engineering and huge economic and personnel losses. The single tower single cable plane cable-stayed bridge is a wonderful work in the bridge, which has been favored in the project in recent years. Because of its special structural form, its dynamic characteristics are different from that of ordinary cable-stayed bridges. It is necessary to study the special seismic design, so it is necessary to study the dynamic characteristics and seismic performance of such important bridges. The study of this paper also has certain guiding significance for the seismic response analysis of long-span cable-stayed bridges.
In this paper, the types and causes of bridge earthquake damage are analyzed, and the fortification targets and design methods of bridge earthquake resistance are expounded. According to the detailed rules of the seismic design of the highway and Bridge (JTG/T B02-01-2008), the single tower single cable plane cable-stayed bridge in the Caofeidian industrial area is taken as the engineering background, and the response spectrum method is adopted to consider the different connection modes between the tower and the beam in the longitudinal direction. From the angle of seismic performance, in view of the nonlinear influence of the sag and the interaction between pile and soil structure, the input of different grades of ground motion is adopted, and the finite element model of the bridge is established by ANSYS software, so as to analyze the dynamic characteristics and seismic performance.
In this paper, according to the different connections between the towers and the beams, the scheme is formulated and selected. From the angle of the seismic performance, it is concluded that the elastic connection device between the beams is favorable to the earthquake resistance of the structure. The parameters of the spring stiffness and the advantages of the elastic connection system are analyzed for the selected tower and the elastic connection scheme between the beams. The elastic connection device selects the viscous dampers more advantageous than the rubber bearing. Through nonlinear time history analysis, the dampers with the damping coefficient C=12000 and the velocity index =0.3 are used longitudinally between the tower beams. Under the submission of the P1 and P2 earthquake, the main tower, the transition pier and the pile foundation can meet the requirements of the performance targets. The structure is basically safe.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.27

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