摘要
以跨海桥梁深水桥墩为对象,建立可考虑波浪、海流及地震共同作用的精细化双向流固耦合计算模型,系统讨论了不同波、流参数下桥墩的地震响应特性及参数影响规律。结果表明,波、流联合作用时,深水桥墩响应峰值随流速、水深、波高的增加而增大,随波浪周期的增大而减小。波、流及地震共同作用下,桥墩响应幅值大于或小于地震单独作用时,但仍以地震作用为主,其响应特征与地震单独作用时相同;桥墩响应峰值随波浪相位、周期的增加而波动,随波高、水深的增加而增大或减小,随流速的增加而先增大后减小。波、流环境影响桥墩的地震响应,其程度与地震动频谱特性及波、流参数有关,其影响幅度最大可达到30.0%以上,在跨海桥梁抗震设计中应予以考虑。
Based on the case study of the deep-water piers of sea-crossing bridges, the refined finite element models of the piers were established to consider the two-way fluid-structure coupling interaction under wave, current and earthquake actions. The seismic response characteristics and influence of parameters of the deep-water piers were systematically discussed under different wave and current parameters. The results show that, under the combined excitations of waves and currents, the peak dynamic responses of piers increase with the augment of current velocity, water depth and wave height, and decrease with the increase of wave period. Under the simultaneous excitations of waves, currents and earthquakes, the maximum dynamic responses of piers are greater or less than those due to earthquake load alone, while the earthquake excitation is still the main factor. The dynamic response characteristics of piers are the same as those under the action of earthquake alone. In addition, the dynamic responses of piers fluctuate with the increase of wave phase and period, increase or decrease with the augment of wave height and water depth. The peak dynamic responses increase first and then decrease along with the increase of current velocity. Wave and current environment can change the seismic response of piers, the extent of which is related to the ground motion spectrum characteristics, as well as the wave and current parameters. The maximum influence of wave and current can be more than 30%. Therefore, the dynamic action of wave and current should be taken into account in the seismic design of sea-crossing deep-water bridges.
作者
江辉
白晓宇
黄磊
李辰
孟宪锋
杨庆山
JIANG Hui;BAI Xiaoyu;HUANG Lei;LI Chen;MENG Xianfeng;YANG Qingshan(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;China Airport Construction Group Co.,Ltd.,Beijing 100101,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2019年第3期117-127,共11页
Journal of the China Railway Society
基金
中央高校基本科研业务费(2018YJS115)
国家自然科学基金(51378050)
高等学校学科创新引智计划(111计划)(B13002)
北京市自然科学基金(8192035)
关键词
跨海桥梁
深水桥墩
波浪
海流
地震
流固耦合
动力响应
sea-crossing bridge
deep-water bridge pier
wave
current
earthquake
fluid-structure coupling interaction
dynamic response
