网格式框架的等效抗侧刚度分析
2020-02-16吴琴张华刚李富江张鑫魏艳辉马克俭
吴琴 张华刚 李富江 张鑫 魏艳辉 马克俭



摘 要:為了解网格式框架抵抗水平荷载作用的能力,基于D值法,假定轴力在结构横截面上呈线性分布,且考虑弯曲变形和剪切变形的影响,得到了在倒三角形分布荷载、均布荷载和顶点集中荷载等作用下结构的等效抗侧刚度公式,并用有限元法及试验做了对比. 结果表1明:结构侧移以剪切变形为主,但弯曲侧移的影响随结构高度的增加而增加,因此应考虑弯曲侧移对总侧移的影响;中柱的轴向变形对结构抗侧刚度及侧移的影响较小;与有限元法及试验结果的折算抗侧刚度相比,本文的等效抗侧刚度公式具有理想的计算精度,可用于预估结构的抗侧能力.
关键词:网格式框架;等效抗侧刚度;D值法;有限元分析;试验研究
中图分类号:TU313.1 文献标志码:A
Analysis of Equivalent Lateral Resisting Stiffness for Grid Frame Structure
WU Qin1,ZHANG Huagang1?,LI Fujiang3,ZHANG Xin1,WEI Yanhui1,MA Kejian1,2
(1. Space Structures Research Center,Guizhou University,Guiyang 550003,China;
2. College of Civil Engineering,Hunan University,Changsha 410082,China;
3. Guizhou Construction Supervision & Consulting Co,Ltd,Guiyang 550081,China)
Abstract:In order to understand the resistance of grid frame structure under horizontal loads,based on D-value method,assuming that axial force is linearly distributed on structural cross section and considering the influence of bending and shear deformation,this study deduced the equivalent lateral resisting stiffness formula under inverted triangular load,uniformly distributed load and vertex concentrated load. The results were compared with that of finite element method and experiment.The results show that lateral displacement of this structure is given priority to shear deformation,and with the increase of structure height,the influence of bending displacement becomes larger,so that the effect of bending displacement on the total lateral displacement should be considered. The influence of axial deformation of middle column on structural lateral resisting stiffness and displacement is smaller.Compared with the calculated lateral stiffness by finite element method or test results,the equivalent lateral stiffness formula in this paper has reliable calculation accuracy,and can be used to estimate the capability of resisting lateral deformation.
Key words:grid frame structure;equivalent lateral stiffness;D-value method;finite element analysis;experimental study
我国的磷矿资源较为丰富,对湿法生产磷酸后排放的磷石膏进行资源化利用,是综合治理磷石膏污染的有效途径. 鉴于当前对磷石膏应用的领域主要集中在化工、建材、农业和矿山回填等这一现
状[1-2],马克俭等[3]提出现浇磷石膏-混凝土网格式框架组合墙结构,可将磷石膏作为承重材料现浇应用于建筑结构中;张华刚、吴琴等[4-5]系统测定了现浇磷石膏的抗压强度和本构关系,并在小高层结构中成功进行了组合墙的工程实践[6];卢亚琴等[7]开展了低周往复水平荷载作用下的缩尺模型试验,表1明这种组合墙破坏时主要表1现为剪切型破坏,这……
