某高层建筑上下部共同作用数值分析结果探讨  

Discussion on Numerical Results of Interaction Between Upper and Lower Parts of a High-rise Building

作　　者：李伟 林智勇 张浩 戴自航[1] LI Wei;LIN Zhiyong;ZHANG Hao;DAI Zihang(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;College of Civil Engineering,Fujian University of Technology,Fuzhou,Fujian 350108,China;Strait Construction and Development Co.,Ltd.,Fuzhou,Fujian 350003,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建工程学院土木工程学院,福建福州350118 [3]中建海峡建设发展有限公司,福建福州350003

出　　处：《水利与建筑工程学报》2022年第3期176-185,共10页Journal of Water Resources and Architectural Engineering

基　　金：福建省自然科学基金资助项目(2018J01626,2021J01600)。

摘　　要：探讨采用不同土体本构模型对高层建筑考虑上下部结构共同作用的受力与变形产生的影响。以一桩筏基础高层建筑为例,采用DIANA有限元软件建立了整体三维模型,地基土分别采用传统的Mohr-Coulomb模型及硬化土HS和硬化土小应变刚度HSS两种土的高等本构模型进行了基础及上部结构在自重荷载下的共同作用对比分析。结果显示:采用HS或HSS模型相较Mohr-Coulomb模型,筏板差异沉降较小,致使上部框架柱底轴力出现“中柱卸荷,边柱加荷”的效应不如后者明显;三种模型下框架梁的弯矩在每跨相交处均发生突变,反映了考虑共同作用后,基础的沉降特别是不均匀沉降对上部结构梁和柱的内力分布的影响;筏板和地表的沉降均呈现中间大外面小的碟形分布;Mohr-Coulomb模型因难以准确描述土的应力-应变关系,其数值计算结果与实际会存在较大偏差,而HSS和HS模型具有较高的定量计算精度,在上部结构-基础-地基土共同作用的数值分析中具有良好的应用前景。The influence of different soil constitutive models on the stress and deformation of high-rise buildings considering the interaction of the upper and lower structures is discussed in this paper by taking a high-rise building with pileraft foundation as an example,the overall three-dimensional model of which is established by DIANA finite element software.A comparative analysis of the interaction of the foundation and the superstructure under the self-weight load is carried out by using the conventional Mohr-Coulomb model and two advanced constitutive models of soil,i.e.,the HS model and the hardening soil HSS model with the small strain stiffness respectively.The results show that the differential settlement of the raft by the HS or HSS model is smaller than that of the Mohr-Coulomb model,and as a result,the effect that"the model column is unloaded and the side column is loaded"represented by the axial forces at the bottom of the upper frame columns is not so evident as that of the latter.The bending moment of the lower frame beam changes abruptly at the intersection of each span,reflecting the influences of the settlement of the foundation,especially the uneven settlement,on the internal force distribution of the beams and columns of the superstructure after considering the interaction.The settlement of both of the raft and ground surface represent a disc-like distribution with greater settlements in the middle and smaller ones outwards.The numerical computation results by the Mohr-Coulomb model will be significantly different from the reality because it is hard to accurately describe the stress-strain relationship of soil.However,the HSS and HS models have a higher quantitative calculation accuracy,and will be of a good application prospect in the numerical analysis of the interaction of superstructure-foundation-ground.

关 键 词：DIANA有限元软件 MOHR-COULOMB模型 桩筏基础 硬化土模型 小应变硬化土模型 

分 类 号：TU43[建筑科学—岩土工程]