地震作用下桩-土-核电结构相互作用的异步分析方法  

Asynchronous analysis method for pile-soil-nuclear power structure interaction under seismic action

作　　者：吕昊 陈少林[1,2] 陆新宇 孙晓颖 LÜHao;CHEN Shao-lin;LU Xin-yu;SUN Xiao-ying(Department of Structural Engineering and Mechanics,College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Department of Civil and Airport Engineering,College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)

机构地区：[1]南京航空航天大学航空学院结构工程与力学系,江苏南京210016 [2]南京航空航天大学民航学院土木与机场工程系,江苏南京211106 [3]中国地震局工程力学研究所,黑龙江哈尔滨150080 [4]中国核电工程有限公司,北京100840

出　　处：《振动工程学报》2024年第6期1033-1042,共10页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51978337,U2039209);“华龙一号及在役核电机组关键技术装备攻关工程项目——核电厂结构分析软件”资助项目(2003-105);国家资助博士后研究人员计划项目(GZC20231496)。

摘　　要：为拓展核电厂的选址范围,有必要对非基岩场地桩基情形的核电结构进行地震安全性评估。在目前的桩-土-结构相互作用分析方法中,Winkler地基梁模型以及p-y法都将桩-土-结构相互作用问题进行了简化,难以反映复杂地基情形。整体有限元法可考虑复杂地基情形,但计算量较大,效率较低。本文基于高效的三维时域土-结构相互作用分区分析(Partitioned Analysis of Soil-Structure Interaction,PASSI)方法,实现桩基与土体分别采用不同时间步距的计算方法,避免土体采用桩基相对较小的时间步距而增加不必要的计算量。本文以AP1000核岛结构作为研究对象,建立了桩-土-核电结构相互作用的三维有限元模型并对其进行分析。通过输入脉冲波验证了该异步算法的有效性,并结合运动相互作用和惯性相互作用,分析了桩身最大剪力和最大弯矩的特点。分析了桩-土-核电结构在地震波输入下的响应。由于桩的自由度数相对于土体的自由度数可以忽略不计,采用桩-土异步算法时,桩附加的计算量可以忽略,这种高效方法有望用于大型核电结构的桩-土-结构动力相互作用分析中。To broaden the site selection for nuclear power plants,it is vital to assess the seismic safety of nuclear power structures in non-rock sites with pile foundations.Current pile-soil-structure interaction analysis methods,such as the Winkler foundation model and the p-y method,simplify the interaction problem and struggle to reflect complex foundation situations.While the integral finite element method can consider complex foundation situations,it is computationally intensive and inefficient.This paper intro-duces an efficient three-dimensional time-domain method,Partitioned Analysis of Soil-Structure Interaction(PASSI),which uses different time steps for pile foundation and soil to avoid unnecessary calculations.A three-dimensional finite element model of the pile-soil-nuclear power structure interaction is established,with the AP1000 nuclear island structure as the research object.The ef-fectiveness of this asynchronous algorithm is verified by inputting pulse waves,and the characteristics of the maximum shear force and bending moment of the pile are analyzed by combining the kinematic and inertial interactions.The response of the pile-soil-nu-clear power structure under the seismic wave input is then analyzed.Since the degrees of freedom of the pile are insignificant com-pared to the soil,the additional computational volume of the pile can be neglected when using the pile-soil asynchronous algorithm.This efficient method is expected to be used in the analysis of the dynamic interaction of large nuclear power structures with pile-soil-structures.

关 键 词：桩-土-结构相互作用 土-结构相互作用分区分析方法 运动相互作用 异步算法 核电抗震设计 

分 类 号：TU311.3[建筑科学—结构工程] TU473.1