CAJ | 학술논문

针对现行海洋平台抗震规范无法考虑平台结构弹塑性抗震性能及地震失效机制问题，提出基于能力谱法海洋平台抗震性能评估方法，获得平台结构抗震性能及失效模式，解决强震作用下海洋平台结构弹/塑性抗震评估技术难题。基于规范推荐地震弹性设计谱，采用折减系数建立弹/塑性反应谱，结合渤海某导管架平台，采用能力谱法进行弹/塑性抗震性能评估。结果表明：能力谱法计算简便，对于以第1阶振型为主导地震响应的平台结构具有较好的精度；采用能力谱法评估地震惯性载荷时须考虑其高度效应，可采用倒三角或高度等效加载方式；桩基失效是平台结构地震作用下主要失效模式，平台抗震设计时应保证桩腿具有足够强度和入泥深度，避免强震作用下桩基失效而导致平台结构整体倾覆。
침대현행해양평태항진규범무법고필평태결구탄소성항진성능급지진실효궤제문제，제출기우능력보법해양평태항진성능평고방법，획득평태결구항진성능급실효모식，해결강진작용하해양평태결구탄/소성항진평고기술난제。기우규범추천지진탄성설계보，채용절감계수건립탄/소성반응보，결합발해모도관가평태，채용능력보법진행탄/소성항진성능평고。결과표명：능력보법계산간편，대우이제1계진형위주도지진향응적평태결구구유교호적정도；채용능력보법평고지진관성재하시수고필기고도효응，가채용도삼각혹고도등효가재방식；장기실효시평태결구지진작용하주요실효모식，평태항진설계시응보증장퇴구유족구강도화입니심도，피면강진작용하장기실효이도치평태결구정체경복。
As the current offshore platform seismic code cannot consider the inelastic seismic performance and the seismic failure mechanism, the seismic capacity evaluation method of offshore platform was proposed based on the capacity spectrum method. On this basis, the seismic performance and failure modes were obtained precisely, to solve the problem of evaluating the seismic behavior under strong earthquake. According to the design seismic spectrum, the inelastic reaction spectrum was established by reduction factor, and seismic evaluation of the jacket platform in Bohai sea of China was accomplished. The results show that the capacity spectrum method is suitable for offshore platform, because of easy calculation and creditable precision. The inverse triangle and high equivalence methods could be used to evaluate the earthquake force, so that the effects of altitude are considered. The pile foundation is one of the main causes leading to the platform to fail under seismic loads. When designing the seismic performance of a jacket platform, the strength and driving depth of the leg should be guar-anteed, in order to avoid failure of pile foundation under strong earthquake which might lead to the platform to overturn.