异型空间桁架+单层网壳复合结构分析与设计  

Analysis and design of special-shaped space truss + single-layer reticulated shell composite structure

作　　者：王钢 赵才其[2] 颜鹏[1] WANG Gang;ZHAO Caiqi;YAN Peng(MCC northwest Engineering Technology Co.,Ltd.,Baotou 014010,China;Institute of Spatial Structure and Morphology,Southeast University,Nanjing 210096,China)

机构地区：[1]中冶西北工程技术有限公司,包头014010 [2]东南大学空间结构与形态研究所,南京210096

出　　处：《建筑结构》2022年第S01期597-602,共6页Building Structure

基　　金：2022年中冶西北科研项目(XB-YF2022008)

摘　　要：本工程平面投影呈X型,左半跨采用空间桁架体系,右半跨采用K6型单层网壳结构。根据结构的特性确定了小震弹性、中震弹性及大震不屈服的抗震性能目标,然后建立MIDAS GEN分析模型进行小震及中震等效弹性分析,以及大震弹塑性分析。结果显示该结构可满足抗震性能目标。建立ABAQUS有限元分析模型,开展充分考虑几何非线性、材料非线性及初始缺陷的稳定性分析。结果表明:本结构的非线性稳定承载力满足规范要求,且不同初始缺陷的分布形式及缺陷幅值对整体结构稳定安全系数影响不大。对抗震及稳定分析所确定的结构薄弱处,开展抗连续倒塌分析。倒塌分析表明,分叉处上端、空间桁架与网壳交界处及支座反力最大圆钢柱均需要进行加固,以防引发整体结构的连续性倒塌。加固措施为:在单层网壳分叉处上端增设交叉腹杆、在交界处设置12mm加劲肋及圆钢柱外围包裹设有钢筋网的混凝土层。The plane projection of the project is X-shaped.The left half span adopts space truss system and the right half span adopts K6 single-layer reticulated shell structure.According to the characteristics of the structure,the seismic performance objectives of small earthquake elasticity,medium earthquake elasticity and non yield in large earthquake are determined,and then the Midas Gen analysis model is established for small earthquake and medium earthquake equivalent elastic analysis and large earthquake dynamic elastic-plastic analysis.The results show that the structure can achieve the seismic performance goal.Establish ABAQUS finite element analysis model and carry out stability analysis with full consideration of geometric nonlinearity,material nonlinearity and initial defects.The results show that the stability bearing capacity of the structure meets the requirements of the code,and the distribution form and amplitude of different initial defects have little effect on the stability safety factor of the overall structure.For the weak parts of the structure determined by the seismic and stability analysis,carry out the anti continuous collapse analysisThe collapse analysis shows that the upper end of the bifurcation,the junction of space truss and reticulated shell and the round steel column with the largest support reaction need to be strengthened to prevent the continuous collapse of the whole structure.The specific reinforcement measures are as follows:add cross web members at the upper end of the bifurcation of single-layer reticulated shell,set 12mm stiffeners at the junction,and wrap the concrete layer with reinforcement mesh around the periphery of round steel column.

关 键 词：异型钢结构 抗震性能设计 非线性稳定性分析 抗连续倒塌分析 

分 类 号：TU399[建筑科学—结构工程]