一、前言大多数近海钢平台设置在地震活动性作为重要设计因素的区域中。地震荷载是如此强烈,以致结构和土的性能具有明显的非线性。加荷的循环性质也会产生完全不同于均衡荷载的反应。为了确定结构-土连续体在强烈地震荷载作用下是否会造成灾难性破坏, I. INTRODUCTION Most offshore steel platforms are located in areas where seismicity is an important design factor. The seismic load is so strong that the properties of the structure and the soil are significantly non-linear. The cyclic nature of the charge also produces a reaction that is completely different from the equilibrium load. In order to determine whether the structure-earth continuum will cause catastrophic damage under strong earthquake loads,