For the cylindrical intersecting-latticed-three-dimensional-beams-system (ILTDBS) reticulated mega-structure with double-layer plane-plate grid substructures, the configuration, form parameters, the support styles of the main structure, and the support ways of the substructures on the main structure are analyzed firstly in this paper. Then the geometrically nonlinear mechanical model and corresponding stability analysis procedure are developed, and the structural stability including buckling modes, ultimate loads under different kinds of conditions and a series of parametric analyses are researched. Moreover, the general failure conditions of the structure are discussed. Finally the basic static properties of the structure are investigated, and a series of parametric analyses with respect to static properties of the structure are performed. All this work will provide theoretical guidance to the actual engineering application of this structure. © 2007 Elsevier Ltd. All rights reserved.

This paper is focused on the research of seismic response of cylindrical latticed-intersectedthree-dimensional-beam-system (LITDBS) reticulated mega-structure with double-layers plane-plate grid sub-structures using response spectrum technique. The distribution law of dynamic internal forces of members in this new structure is researched firstly. Reasonable number of vibration modes recommended for use is discussed. Seismic behaviors of the structure under different directional seismic loads are analyzed; therefore the reasonable required components of seismic loads for seismic design are obtained. A series of geometrical parameters analysis are carried out at last. All the works will provide guides in theory for the use of this structure.

本文针对子结构为单层叉筒网壳的圆柱面交叉立体桁架系巨型网格结构，分析了结构的构成、形体参数、支承方式等；建立了几何非线性力学模型，编制了相应的稳定分析程序；针对本结构的特点，着重研究了结构的稳定性能、失稳形式（局部失稳与整体失稳），以参数分析的形式研究了结构局部失稳与整体失稳的关系，找出了不同跨度结构在整体与局部失稳临界状态某些参数的取值规律，并给出了整体与局部失稳状态的分界曲线，可为该结构形式的工程应用提供参考。

针对交叉立体桁架系巨型网格结构杆件、节点多、计算工作量大的特点，提出了超级有限元与子结构相结合的简化求解方法：采用三节点立体桁架超级元来处理主体结构中的立体桁架，用子结构法来处理大网格内的子结构。推导了超级元刚度矩阵及子结构参与协同承载时对整体结构的刚度贡献。经编程对比计算分析表明，该法计算精度高，误差基本保持在5%以内，计算工作量较完全有限元法明显降低，且可考虑子结构的参与协同承载，是分析巨型网格结构的一种比较优越的方法。

针对系巨型网格结构杆件和节点多、计算工作量大的特点，进行了简化计算方面的研究，提出了将立体桁架等效为连续实体梁、按空间法进行有限元计算的等效空间刚架法。分析了立体桁架的等效截面、等效抗弯刚度，并详细推导了其等效抗扭刚度，分析了主体结构不同边界条件的等效处理方法。对比计算分析表明，该方法计算精度高，主要受力杆件的误差保持在5%以内，计算工作量较完全有限元法大幅度降低，是分析巨型网格结构的一种比较优越的方法。