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利用土层和半空间的精确动力刚度矩阵,可求解地震波斜入射,水平层状场地的动力响应,并可得到各土层的位移、应力及应变结果。结合等效线性化算法,可分析斜入射地震波(SH,SV,P)时场地的非线性地震反应。研究表明:入射角对地表的加速度峰值有重要影响,未必在波垂直入射时最大,可能有多个峰值;实际地震波入射角平均在60°左右,与斜入射SV波时峰值放大倍数最大值出现的角度基本一致,按垂直入射计算得到的结果可能不安全,表明了在场地非线性地震反应中研究斜入射的必要性。
Using the accurate dynamic stiffness matrix in soil and half space, the dynamic responses of seismic waves to obliquely incident and horizontally layered sites can be solved and the displacement, stress and strain results of each soil layer can be obtained. Combined with the equivalent linearization algorithm, the nonlinear seismic response can be analyzed when oblique incident seismic waves (SH, SV, P) are used. The results show that the incident angle has an important influence on the peak acceleration of the earth’s surface and may not be the maximum at the vertical incidence of the wave and may have multiple peaks. The actual incident angle of seismic waves is about 60 ° on average, and the peak magnification maximum appears when the incident SV wave is oblique Are basically the same. The result calculated by vertical incidence may be unsafe, which shows the necessity of studying oblique incident in the nonlinear seismic response of the site.