索拱桁架-单层网壳复合空间结构的结构设计与稳定性分析

STRUCTURAL DESIGN AND STABILITY ANALYSIS OF A COMPOSITE SPACE STRUCTURE COMPOSED OF CABLE-SUPPORTED ARCH TRUSS AND SINGLE-LAYER RETICULATED SHELL

索拱桁架-单层柱面网壳结构综合了索拱桁架与单层网壳结构的优点,可减小支座水平推力、减小单层网壳纵向跨度、提高结构的稳定性,从而实现结构更大跨度的跨越。以一拟建198 m跨、且需支承于15 m高单排混凝土柱列的大跨度煤棚钢结构屋盖为工程背景,开展大跨度索拱桁架-单层柱面网壳结构的设计分析工作,对结构的预应力设计值进行优化分析并在此基础上详细分析结构静动力特性,论证借助索拱桁架-单层柱面网壳结构跨越近200 m级跨度的可行性,揭示结构在各种可能荷载工况下的内力及变形分布规律,并利用ANSYS有限元软件计算了结构的线弹性屈曲特征值和考虑材料和几何双重非线性的极限承载力。

The composite structure which is composed of cable-supported arch truss and single-layer cylindrical reticulated shell structure combines the advantages of cable-supported arch truss structure and single-layer reticulated shell structure,both the horizontal thrust to the supporting and the longitudinal span of the single-layer reticulated shell can be reduced,and the stability of the structure can be improved,resulting in longer span of the structure.Based on a long-span coal shed steel structure roof with a 198 m span,which needs to be supported on 15 m high single-row concrete columns,the design and analysis of the long-span cable-supported arch truss and single-layer cylindrical reticulated shell structure was carried out.After optimizing the prestress of the structure,the static and dynamic characteristics of the structure were analyzed in detail,the feasibility of the structure spanning nearly 200 m span was demonstrated then,and the internal force and deformation distribution of the structure under various possible load conditions were revealed.The ANSYS finite element analysis software was used to calculate both the linear elastic buckling characteristic value of the structure and the ultimate bearing capacity considering the double nonlinearity of material and geometry.