摘要
基于土-群桩相互作用整体有限元一体化模型,将群桩基础与土体的相互作用分开考虑,一部分为群桩承台与周围土体的相互作用,另一部分为群桩与土体的相互作用,对空间S-R简化计算模型进行优化,提出了优化后的空间D-S-R模型。建立了考虑土-群桩作用下的单层柱面网壳结构体系的S-R模型、D-S-R模型及整体有限元一体化模型,对比分析了三种计算模型下的单层柱面网壳自振特性及不同地震波激励下的地震响应规律。研究结果表明,S-R模型及D-S-R模型均可有效代替整体有限元模型模拟土-群桩相互作用下的单层柱面网壳结构体系的动力响应,若仅是观察分析加速度及位移波形响应规律,可采用计算更为方便的S-R模型;若需精准获取结构节点加速度、节点位移及杆件内力最值,进行杆件截面材料的优化及节点精细化设计分析,建议选用D-S-R模型,该模型与一体化模型计算偏差可控制在5%之内,且适用于分析不同分层土下的地震响应,有效降低有限元一体化模型的建模难度,节省模拟计算时间,具备良好的工程实际应用价值。
Based on the integral finite element model of soil-pile group foundation interaction,the interaction between pile group foundation and soil is divided into two parts:the interaction between pile group foundation cap and surrounding soil,and the interaction between pile group and soil.The spatial S-R simplified calculation model is optimized,and an improved spatial D-S-R model is proposed.Then,the S-R model,D-S-R model and integral finite element model of single-layer cylindrical latticed shell system considering soil-pile group foundation interaction are established.The natural vibration characteristics and seismic response laws of the single-layer cylindrical latticed shell under the three calculation models and different seismic wave excitations are systematically compared and analyzed among the three calculation models.The results show that both the S-R model and the D-S-R model can effectively replace the integral finite element model to simulate the dynamic response of a single-layer cylindrical latticed shell system considering soil-pile group interaction..The S-R model,which is more convenient for calculation,can be adopted if only the response laws of acceleration and displacement waveforms are observed and analyzed.For accurately obtaining the maximum and minimum values of structural node acceleration,node displacement and member internal forces,as well as for the optimization of member cross-section materials and refined node analysis,the D-S-R model is recommended.The calculation deviation between the D-S-R model and the integral finite element model can be controlled within 5%.In addition,it is applicable to the seismic response analysis of different layered soils,reduces the modeling difficulty of the integral finite element model effectively,and saves simulation and calculation time,thus demonstrating good practical engineering application value.
作者
刘毅
Liu Yi(Baise University,School of Civil Engineering and Architecture,Baise Guangxi 533000,China;SIASUN Robot Investment Co.,Ltd.,Beijing 100020,China)
出处
《山西建筑》
2026年第9期6-13,共8页
Shanxi Architecture
基金
国家自然科学基金资助项目(项目编号:51078010,51278008)。
关键词
空间D-S-R模型
群桩
单层柱面网壳
地震响应
杆件内力最值
spatial D-S-R model
pile group
single-layer cylindrical latticed shell
seismic response
extreme values of member internal forces
