高速鐵路橋抗震及減隔震分析
[Abstract]:In recent years, the rapid development of economy has promoted the reform of railway system and the technological innovation of transportation means, and high-speed railway has emerged as the times require. As an important part of lifeline engineering, bridge will cause serious consequences once it is destroyed in earthquake. But our country is located in the earthquake-prone area, the frequent bridge earthquake damage has brought us the profound lesson. There are few researches on seismic resistance and isolation of high speed railway, especially on high damping rubber bearing in high speed railway. In this paper, the aseismic performance of high speed railway piers is analyzed, and the analysis of high damping rubber isolation bearing applied to the isolation of high speed railway bridge is innovative, taking the simply supported beam bridge in Changsha-Zhuzhou-Xiangtan intercity as the engineering background. The single pier model and simply supported beam model are established by using Midas-civil bridge finite element software, and the moment curvature analysis and static elastoplastic analysis are carried out on the single pier model. The results of dynamic time history analysis of simply supported beam model are as follows: (1) by analyzing the influence of cross section, longitudinal reinforcement strength, concrete strength and axial compression ratio on moment curvature, the following conclusions are obtained: in circular, square, rectangular and circular end sections, The seismic performance of circular end section is better, but that of rectangle is the weakest. (2) the static elastic-plastic analysis of five kinds of piers with the height of 5 m ~ 9 m ~ (13 m) or 17m ~ 20 m shows that there are always points between the capacity spectrum and the demand spectrum, which indicate that the pier meets the seismic demand. However, the point of intersection is gradually transferred from the elastic zone of the pier to the plastic zone, which indicates that the increase of pier height reduces the seismic performance of the pier. Therefore, the increase of pier flexibility should be taken into account in the seismic design of bridge piers. (3) the height of pier, the type of isolation support, the site, The effects of fortification intensity and other factors on the isolation rate are obtained: when the pier is 17 m high, the simple supported beam has obvious response to the ground motion, and the isolation effect is better, which can be used for reference to the earthquake resistance of the bridge pier, and the friction pendulum bearing is used for reference. High damping rubber bearings and lead rubber bearings have good isolation effect on shear failure of pier column, while lead rubber isolation bearings have better isolation effect on beam displacement. The friction pendulum bearing has a good effect on the bending moment of the base. Under the conditions of different sites and different fortification intensity, the isolation rate of bridge is analyzed. The isolation rate of Hollywood wave Sanfer wave of high damping bearing is large, and the isolation effect is obvious. When the intensity of earthquake fortification is 8 degrees, the displacement isolation rate of pier top is the largest, while the displacement isolation rate of beam is the least.
【學位授予單位】:中南林業(yè)科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U442.55
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