摘要
基于我国南海地域的国际标准化组织规范反应谱,改进非线性最小二乘优化算法,合成了4条时长为30 s的耐震时程加速度曲线,并验证改进算法的精度与可靠性;建立平台弹塑性有限元模型,在考虑海水因素的条件下,分别基于增量动力法与耐震时程法对平台在强震下的动力响应进行对比分析,评价耐震时程法用于评估平台动力响应的适用性。结果表明:改进算法减小了迭代次数,较大程度地提高了曲线合成精度,与增量动力法相比,耐震时程法极大地减小了时程分析次数,可很好地预测平台结构的顶点位移、最大层间位移角以及基底剪力。由于耐震时程法计算效率高,计算精度较好,这为导管架平台地震动力响应分析提供了一种新的有效方法。
Four endurance time acceleration curves(ETACs)with duration of 30 s were generated based on South China Sea design response spectra of the International Organization for Standardization(ISO)by using an improved nonlinear least-square method.In addition,the accuracy and reliability of the procedure were discussed.Under the condition of considering seawater,the dynamic response of the platform under strong earthquakes was contrasted and analyzed based on an incremental dynamic method and an endurance time method(ETM).And the rationality of ETM used to evaluate the platform dynamic response was evaluated.The results show that the improved method reduces the iterative times and greatly improves precision of curves.Compared with the incremental dynamic method,ETM greatly reduces the times of time-history analysis.For ETM,the top displacement,the maximum interstory drift ratio and the base shear of the platform structure can be well predicted.Since ETM has the characteristics of high efficiency in calculation,it provides a new and effective method for dynamic response analysis of jacket platforms.
作者
孙久洋
吕涛
陈国明
孙树峰
宋玉东
英豪
SUN Jiuyang;Lü Tao;CHEN Guoming;SUN Shufeng;SONG Yudong;YING Hao(Centre for Offshore Engineering and Safety Technology,China University of Petroleum,Qingdao 266580,China;Shandong offshore Equipment Co.,Ltd.,Qingdao 266555,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第20期232-241,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(51579246)。
