前言现行美国石油学会(API)的建筑规则规定,设计位于地震危险区中的固定式近海塔架时,必须既考虑强度,也要考虑延性。即结构必须设计得足够强劲,以便在中等地震过程中不产生屈服。所考虑的地震强度要能与设计陆地上的一些重要结构时考虑 Foreword The current building rules of the American Petroleum Institute (API) stipulate that when designing a fixed offshore tower in a seismic hazard zone, both strength and ductility must be considered. That is, the structure must be designed to be strong enough so that yield does not occur during a moderate earthquake. The seismic intensity under consideration must be considered when designing some important structures on land