摘要
人工合成地震动作为抗震设计的一种重要手段,能够模拟出具有指定频率和幅度的地震波形,用于评估桥梁结构的抗震性能。基于人工合成地震动,对桥梁的破坏机理和结构变形特点进行研究,总结近断层桥梁抗震的应用及影响,展望近断层桥梁抗震的研究方向。结果表明:通过对地震波的脉冲成分提取,具有滑冲效应脉冲的近断层地震动引起的结构响应远大于具有方向性效应脉冲的近断层地震动。当滑冲效应和方向性效应均达到脉冲峰值时,结构响应最明显,引起严重的地震破坏。具有滑冲效应脉冲的地震动引起的永久位移会进一步加剧震害。黏弹性人工边界可对子结构节点施加地震荷载,时程分析结果更贴近现实。本文成果可为桥梁工程的抗震设计和安全评估提供有效支撑。
As an important mean of seismic design,synthetic ground earthquake motion can simulate seismic waveforms with specified frequency and amplitude to evaluate the seismic performance of bridge structures.Based on synthetic ground earthquake motion,the failure mechanism and structural deformation characteristics of bridges are studied,the application and influence of seismic resistance of near-fault bridges are summarized,and the research direction of seismic resistance of near-fault bridges is prospected.The results show that the structural response caused by the near-fault ground earthquake motion with slip effect pulse is much greater than that caused by the near-fault ground earthquake motion with directional effect pulse by extracting the pulse components of the earthquake wave.When both the slip effect and the directivity effect reach the peak of the pulse,the structural response is the most obvious,causing serious earthquake damage.The permanent displacement of the displacement caused by the ground earthquake motion with the sliding effect pulse will further aggravate the earthquake damage.The viscoelastic artificial boundary can apply seismic loads to the substructure joints,and the time course analysis results are closer to reality.The results can provide effective support for the earthquake design and safety assessment of bridge engineering.
作者
王燕航
刘浪
WANG Yanhang;LIU Lang(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《工程建设》
2024年第7期40-45,共6页
Engineering Construction
关键词
近断层桥梁
人工合成地震动
桥梁抗震
耐震性能
破坏机理
抗震设计
near-fault bridge
synthetic ground earthquake motion
bridge seismic resistance
seismic performance
failure mechanism
seismic design
