【摘要】 在三角级数和快速傅里叶变换基础上,基于相位差谱法合成了具有频率非平稳的人工地震动。分析了三角级数合成地震动基本原理和优缺点,利用强度包络函数刻画强度非平稳;基于相位差谱法合成地震动,能考虑其相干性、场地效应、多维性和非平稳特性,通过频域拟合目标反应谱的方法对新合成地震动进行幅值精度迭代修正;以某三跨高墩钢构桥为背景,从PEER中选取6条实际地震动,和三角级数法对提出的相位差谱法合成地震动进行准确性验证。更多还原

【Abstract】 Based on the triangular series and fast fourier transform,artificial ground motion with frequency non-stationary is synthesized based on phase difference spectrum method. The basic principles,advantages and disadvantages of triangular series synthetic ground motion are analyzed.Ground motion is synthesized based on phase difference spectrum method. Coherence,field effect,multi-dimensional and non-stationary characteristics can be considered. The target response is fitted by frequency domain. The spectral method is used to iteratively correct the amplitude accuracy of the newly synthesized ground motion. Based on a three-span high-rise steel bridge,6 actual ground motions are selected from the PEER,and the phase difference proposed by the triangle series method is proposed. Spectral synthesis of ground motions for accuracy verification.更多还原