摘要
为探讨大跨悬索桥在动力激励下中央扣的作用,以重庆中渡长江大桥为研究对象,建立了大跨悬索桥的3种中央扣模式的空间动力计算模型,对其进行动力特性分析和地震时程分析。研究结果表明：中央扣限制了结构的纵飘特性;设置中央扣对加劲梁和桥塔的地震反应有利,但会增大主缆的应力;中央扣的设置方式宜采用刚性中央扣。研究结果可为今后大跨悬索桥设计提供借鉴。
In order to investigate the function of central buckles of the long-span suspension bridge under dynamic loads excitation, the spatial dynamic finite element model for Chongqing Zhongdu Yangtze River Bridge with three types of centra1 buckles were established. Self-vibration behavior analysis and time history analysis for the Bridge under seismic excitation were carried out. The results show that： The central buckle restricts the longitudinal floating characteristic of the structure; The central buckle is advantageous to the seismic response of stiffening girder and pylon, but will increase the stress of the main cable; The central buckle should adopt the rigid central buckle. The research results can provide references for the design of long-span suspension bridges in the future.
作者
王小飞
WANG Xiao-fei(China Railway SIYUAN Survey and Design Group Co.,Ltd.Wuhan 43006)
出处
《铁道勘测与设计》
2018年第3期68-72,共5页
Railway Survey and Design
关键词
大跨悬索桥
动力特性
刚性中央扣
柔性中央扣
时程分析
Long-span suspension bridge
Dynamic characteristics
Rigid central buckle
Flexible central buckle
Time history analysis
