建筑结构学报2025，Vol.46Issue(4)：91-105,15.DOI:10.14006/j.jzjgxb.2024.0229
基于有限质点法的结构隔震滑移铅芯橡胶支座计算模型研究
Research on computational model of sliding lead rubber bearing in structural seismic isolation based on finite particle method
摘要
Abstract
Sliding lead rubber bearing(SLRB)is capable of accommodating thermal-induced structural deformation and achieving partial resetting energy dissipation.Existing simplified models of SLRBs mostly ignore the layered structure of rubber bearings and have limitations in universality and scalability,while refine models lead to substantial computational costs with a large number of nodes and elements.Thus,a multi-layered spring model for SLRBs is proposed based on the fundamental principles of the finite particle method.Using multi-layered spring elements,hysteretic spring elements,and friction limiter elements,the model separately characterizes the laminated rubber,lead core,and sliding surface components of the bearings,respectively.The multi-layered spring element employs a 3D Zigzag shape function to describe interlayer serrated deformation in the laminated rubber,and based on the simplified assumption of stress continuity,an iterative strain update algorithm is proposed to ensure continuity of interlayer forces in dynamic nonlinear scenarios.The hysteretic spring element incorporates considerations for thermal strength degradation and initial hardening effects to more accurately depict the mechanical properties of the lead core.The friction limiter element is created based on a friction model and achieves the effect of limit constraint through direct solving method.The multi-layered spring model has a computational acceleration ratio of 34.32 compared to the refined solid model,effectively capturing the strength degradation and nonlinear mechanical behavior of the bearing under cyclic loading,with an error of less than 3％.The model proves to be suitable for structural seismic response analysis.The analysis results reveal that the thermal strength degradation of the bearing leads to a decrease in equivalent stiffness,causing greater deformation of the bearing and reducing the internal force response of the components and the acceleration response of the structure.关键词
滑移铅芯橡胶支座/计算模型/有限质点法/分层弹簧单元/应力连续Key words
sliding lead rubber bearing/computational model/finite particle method/multi-layered spring element/stress continuity分类
土木建筑引用本文复制引用
姚俊杰,郑延丰,唐敬哲,杨超,罗尧治..基于有限质点法的结构隔震滑移铅芯橡胶支座计算模型研究[J].建筑结构学报,2025,46(4):91-105,15.基金项目
国家自然科学基金重点项目(52238001,52378203,52308218),国家重点研发计划(2023YFC3805600). （52238001,52378203,52308218）
