In everyday life, when the structural span of a grid structure is large, the height of the grid structure will increase accordingly. Therefore, for large-span structures, the space of the hollow grid layer can be used as a separate architectural level. This hollow grid structure serves both as a structural layer and an architectural layer, while also possessing a high degree of spanning capability. This innovative structural system allows for the interweaving of large and small spaces, overcoming the limitations of previous large spaces often located at the bottom or top of buildings. It is particularly suitable for buildings with many large spans and multiple floors.
Principles of Grid Design, Fabrication, and Production
1. The process characteristics of the high-altitude loose loading method
2. The truss assembly implementation features a novel space structure system known as the jump-layer hollow truss structure, which evolves from the hollow truss structural system. The processing of this system consists of alternating vertical arrangements of hollow truss layers and space frames or space trusses that support the hollow truss.
This article systematically investigates the new space structural system from aspects such as its composition, static characteristics, and seismic performance. The composition of different structures results in varying load-bearing properties. Based on the common type of stepped space grid structure, the article analyzes and studies the internal force distribution and deformation of different types of stepped space grid structures with additional diagonal bracing, unequal spacing in the grid, and the support being a space truss under both vertical and horizontal loads. It also further analyzes the changes in structural internal forces and deformation when the floor slab is involved in the work and pre-stressed. The conclusions from the grid processing analysis and calculations provide a theoretical reference for the selection and design of the structure in engineering design.
After a detailed study of the structural behavior under vertical loads, this paper proposes a simplified analytical method for the jump-floor hollow truss structure, based on the flexibility method of cross-beam systems considering shear deformation and the layered method for multi-story frames under vertical loads. This method significantly improves upon the simplified approaches previously proposed by some scholars and offers high computational accuracy, particularly suitable for preliminary design of such structures. For the jump-floor hollow truss structure, the conventional notion is that the system has poor resistance to collapse under strong seismic actions. Through the analysis of the natural vibration characteristics of different types of jump-floor hollow truss structures, this paper reveals the influence of changes in truss stiffness and support structure stiffness on the natural frequencies and vibration modes of the structure.
This article investigates the seismic performance of a structure under one-dimensional single and simultaneous excitations in three directions using the response spectrum method. It concludes the variation laws of internal forces and deformations under seismic action and the reasonable mode truncation order for seismic design using the response spectrum method.
Furthermore, this article investigates the linear elastic response of a jump floor空腹lattice structure under common earthquakes and the elastic-plastic response under rare earthquakes using the time-history analysis method. The elastic-plastic response under rare earthquakes indicates that, under conditions of selecting appropriate cross-sections and reinforcement ratios, the processing of this structural system by the lattice can meet the design principle of "not collapsing in a major earthquake" as specified by the code.
Additionally, this article compares the analysis results of the response spectrum method with the time-history method, providing guidance for the seismic design of this new structural system.
