摘要
以某大跨度高墩连续刚构桥为研究对象,应用Midas有限元软件,建立该桥的整体空间有限元计算模型,开展自振特性分析,并进行反应谱和弹性时程分析;同时还采用双线性滞回曲线模拟摩擦摆支座进行非线性时程分析及抗震性能验算。分析结果表明:引入摩擦摆支座后,桥梁的基频降低,延长了桥梁的自振周期,对抗震有利;桥梁内力响应、位移响应均有较大幅度减小,且对顺桥向的地震响应影响较大;隔震后桥墩在E2地震作用下的计算弯矩小于其初始屈服弯矩,处于弹性工作状态,满足既定的抗震性能目标。
Taking a long span continuous rigid frame bridge with high piers as the research object,the overall spatial finite element model of the bridge was established by finite element software of Midas to analyze its self- vibration characteristics,and response spectrum analysis and elastic time- history analysis were further carried out. A bilinear hysteretic curve was also adopted to simulate the friction pendulum bearing so as to carry out a nonlinear time history analysis and an anti- seismic performance analysis for the bridge. The analysis results show that the basic frequency of the bridge structure is reduced and the self- vibration duration is prolonged by the friction pendulum bearing,which has positive effect on the anti- seismic performance; The deployment of the bearing significantly can reduce the internal force response and the displacement response,and greatly affect the seismic response in the direction along the bridge. After isolation,the calculated moments of the piers are less than the initial yielding moment under the E2 seismic load,which indicates that the piers are in an elastic state and the bridge is capable of meeting the given anti- seismic requirements.
出处
《人民长江》
北大核心
2016年第19期72-76,共5页
Yangtze River
关键词
高墩连续刚构桥
自振特性
摩擦摆隔震支座
地震响应
continuous rigid frame bridge with high piers
self-vibration characteristics
friction pendulum bearing
seismic response
