梁系平面刚度偏心分布高桩平台结构地震响应  

Seismic response of high piled platform structure with eccentrically distributed plane stiffness of beam system

作　　者：李亚 吴兵 LI Ya;WU Bing(CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China;CMRC Zhoushan Development Co.,Ltd.,Zhoushan 316021,China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032 [2]中国矿产资源集团舟山发展有限公司,浙江舟山316021

出　　处：《水运工程》2024年第4期22-27,共6页Port & Waterway Engineering

摘　　要：基于工程实例,采用反应谱方法、时程分析法对梁系平面刚度偏心分布高桩平台结构地震响应规律进行分析研究。结果发现:横向地震作用下,反应谱法和人工波时程分析法计算结果较为接近,天然波时程分析法结果则因选波呈现差异;桩基二维、三维模型计算结果较为接近,横梁二维、三维模型剪力峰值计算结果接近,弯矩峰值结果差异大。纵向地震作用下,三维反应谱法和人工波时程分析法计算结果接近。不同计算模式对比表明三维反应谱法适应性较好。抗震设防烈度大于7度时,该类型平台结构桩基不宜选用PHC桩。对梁-板连接刚性系数λ进行参数分析表明:λ变化对横梁、纵梁内力的影响大于对桩基的影响,对纵横梁弯矩的影响大于对剪力的影响,且纵向地震作用下影响程度大于横向地震。说明板、梁之间的约束状态改变了结构的刚度分配情况,进而对结构的地震效应产生规律性影响。Based on an engineering example,the seismic response characteristic of high piled platform structure with eccentrically distributed plane stiffness of beam system is studied by response spectrum method and time history analysis.It shows that results of response spectrum method and artificial wave time history analysis are close under transverse earthquake action,while the result of natural wave is different due to wave selection.The calculation results of piles are close for 2D and 3D model,and the peak shear force of transverse beam model are close for 2D and 3D mode,while the peak bending moment of which differ greatly.The results of 3D response spectrum method and artificial wave time history analysis are close under longitudinal earthquake.The comparison of different calculation modes shows that the 3D response spectrum method has good adaptability.If the seismic precautionary intensity is greater than 7-degree,PHC pile is not suitable for this type of platform.Parametric analysis of the beam-plate connection rigidity coefficientλshows that the effect ofλchange on the internal forces of transverse or longitudinal beam is greater than that on the pile,the effect on the bending moment of transverse or longitudinal beam is greater than that on the shear force,and the influence degree under the longitudinal earthquake is greater than that under the transverse earthquake,which indicates that the constraint state between plate and beam changes the structural stiffness distribution,and then has regular influence on the seismic effect.

关 键 词：高桩平台 平面刚度偏心 地震响应 反应谱法 时程分析法 连接刚性系数 

分 类 号：U656.113[交通运输工程—港口、海岸及近海工程] TU352[交通运输工程—船舶与海洋工程]