板锥网壳结构的承载能力分析

Analysis on Bearing Capacity of Plate-Cone Reticulated Shell

板锥网壳结构是一种受力性能合理,技术经济效益良好的新型空间结构形式。本文考虑板片和杆件协同工作时的几何非线性,采用弧长法跟踪荷载—位移全过程平衡路径,对板锥网壳结构的极限承载力性能进行全过程非线性跟踪分析,确定其稳定性能及杆件和锥体单元板件屈服顺序,对板锥网壳结构的破坏机理和极限承载力等问题进行了研究,并与普通双层网壳结构进行了比较,得出了可应用于工程实践的重要结论。

The plate-cone reticulated shell is a new type of space structures of half continuity and half lattice, and it is a type of double-layer reticulated shells in which ventral members is replaced by cone elements. This paper carries out the deep study on stability ultimate bearing capacity and failure mechanism of the plate-cone reticulated shell considering geometrical nonlinearity of coordinating work between plates and members. Stability bearing capacity of the plate-cone reticulated shell with different kinds of structure form, considering the geometrical nonlinearity, is analyzed by using large finite element analysis software ANSYS, tracking complete process balance path for load-displacement by using arc-length method; the several problems of the plate-cone reticulated shell are studied, such as destruction mechanism, structural ductility, stability ultimate bearing capacity and strength reserve; then some important conclusions are obtained. After analyzing the stability behavior of the double-layer reticulated shell by ANSYS and comparing it with the plate-cone reticulated shell, it is proved that the plate-cone reticulated shell is more advantageous than the double-layer reticulated shell in the aspect of stability bearing capacity behavior.