【摘要】 本文首先基于渤海海域的地震环境及地震危险性特征,根据46个海洋平台的设计地震动参数,分析了不同设防水准的设计地震动参数之间的关系;然后,采用与其他工程类比的方法,确定了海洋平台抗震设防的两级目标;通过与国内其他规范的类比,确定了海洋平台强度设计地震的概率水准取重现期200年,变形设计地震的概率水准取重现期1000—2500年,并深入分析论证了其合理性;最后,根据渤海地区的地震危险性分区和地震动参数区划给出了相应的设防参数。本文是对渤海地区多年来海洋平台抗震设防经验的总结,是对我国海洋平台抗震设防标准的探索性研究。更多还原

【Abstract】 Based on the seismo-tectonic background and the seismic risk characters of Bohai Sea region, we analyzed the design seismic parameters of 46 platforms in Bohai Sea, as well as the ratios of the peak accelerations for different probability levels. In accordance with the two-stage design method, a scheme of two design seismic levels is proposed, and two fortification goals are established respectively for the strength level earthquake and ductility level earthquake. By comparison to the Chinese seismic code for buildings it is determined that the probability level for the strength and ductility level earthquake takes respectively return period of 200 and 1000—2500 years, and further expounded on its rationality. Finally, the fortification parameters in sub-regions of Bohai area are given in the light of seismic risk zonation and ground motion division. This article is a summary of experience from many years work of offshore platform seismic fortification, and an exploratory study on the seismic fortification standard of offshore platforms in China, which may serve as reference for the standard establishment.更多还原