近断层地震动对大跨钢管拱桥作用指标研究

Seismic Action Assessment Indicator of Near-fault Ground Motion for Long-span CFST Arch Bridge

结合地震动的频谱特性,研究了钢管混凝土拱桥受近断层地震动作用的评价指标。根据长周期、大跨拱桥结构易受地震低频分量和时域能量脉冲破坏作用的特点,提出了利用二进正交小波分解地震信号,并综合考虑各小波分量峰值对结构的作用影响,得到可以用来评价近断层地震动对所研究拱桥结构破坏作用的指标,体现了基于性能的结构抗震设计思想。

Assessment indicator of the near-fault ground motions on CFST arch bridge was studied.According to the fact that long-span arch bridge was liable to be destroyed by the seismic low-frequency impulse,decomposition of seismic signal by dyadic orthogonal wavelet transform was proposed;the influence of wavelet component peak values on structure was taken into account;assessment indicator of seismic action was proposed;performance-based seismic design was shown.