速度锁定支座的设计与减震性能分析

Analysis of Design and Seismic Isolation Performance of Luck- up Bearing

研究目的:随着我国高速铁路的蓬勃发展及世界各地强烈地震的频发,桥梁减隔震技术及产品迎来其推广应用的最佳机遇。本文介绍速度锁定支座的工作原理、设计方法,并对其进行锁定性能等测试,另外还对速度锁定支座进行实桥减震性能分析。通过对某城际铁路预应力混凝土连续梁桥进行非线性时程分析,对比、验证其减震效果。研究结论:通过分析速度锁定支座的试验和实桥分析结果,可以得出:(1)速度锁定支座的锁定装置在快速荷载下能够迅速实现锁定功能,慢速状态下能够自由滑动;(2)在10万次的疲劳测试中不会出现泄露、卡滞现象;(3)输入地震波后速度锁定支座的锁定装置达到锁定速度时,活动支座发挥固定支座的功能;(4)安装速度锁定支座后,桥梁固定墩水平力较未安装时大幅降低;(5)桥梁活动墩参与承受水平力且其墩顶水平力比较接近,从而可适当减小原固定主墩外形尺寸及其配筋量;(6)速度锁定支座减震效果良好,是可广泛推广应用于高烈度地震区铁路桥梁的隔震支座。

Research purposes： With the rapid development of high - speed railway in China and frequent strong earthquakes around the world, seismic isolation technology and products about bridge ushered in the spread and application of the best opportunities. This paper introduces the working principle and design method of lock - up device bearing, and also does locking performance test. In addition, this paper analyses damping properties of lock - up device bearing on bridges to verify its damping effect, through non - linear of time history analysis on the newly - built prestressed concrete continuous beam bridge of a railway between cities. Research conclusions： By analyzing results of tests and researching computation results of lock - up device bearing, we can get following research conclusions ： （ 1 ） The lock - up device bearing will quickly implement lock function under quick loading, and can slide freely under slow state. （2）The fatigue test for 100 thousand times shows that no leakage and clamping stagnation happen. （3）Test results of damping properties on bridges show that after importing earthquake wave and the speed of lock - up device bearing reaches locking value, shifting bearing plays the function of fixed bearing. （4） Installation of lock - up device bearing will sharply reduce horizontal force of main fixed pier. （ 5 ） Main activity pier will bear horizontal force, and horizontal forces of main piers top are close to each other, which can reduce overall dimensions and reinforcement of fixed pier. （6） Lock - up device bearing has advantage of isolation - effective. It is the ideal isolation bearings for railway bridges in high seismic intensity zone.