[China Aluminum Network] spatial grid structure is composed of roughly the same grid or a combination of basic structural units with smaller dimensions. It can transmit three-dimensional spatial structure of force flow. The aluminum alloy spatial grid structure involved in this paper contains Single and double-layer reticulated shells and grid shelves. If classified by the stiffness of the joints, the aluminum alloy grid and the double-layer reticulated shell are articulated systems, and the aluminum alloy single-layer reticulated shell is a rigid-joint system. That is, it is a pair of grids and double-layer reticulated shells. For structural analysis, it can be assumed that the joints are articulated and that the members are only subjected to axial forces; for single-layer reticulated shells, the joints may be assumed to be rigidly connected, and in addition to the axial forces, the members are also subjected to bending moments, torques, and shear forces. According to the unit composition classification, the aluminum alloy space grid structure is a rigid unit structure, which includes a single-layer reticulated shell with a beam element as a basic component, a grid frame with a rod element as a basic component, and a double-layer reticulated shell. In the middle, the rod unit corresponds to the hinge system, the node has 3 degrees of freedom, the component unit is only affected by the axial force, the beam unit corresponds to the rigid connection system, each node has 6 degrees of freedom, and the component unit receives the axial force while receiving the Non-negligible bends In fact, any node system used in engineering is neither ideally articulated nor ideally rigid. The nodes are all in a semi-rigid state, and the model used in the structural analysis is only a simplified method of analysis in structural analysis. As far as possible, the structural model that conforms to the actual stress behavior of the structure should be used, and its rationality should be fully considered to ensure the safety of the structure. Metal Flower Pot,Striped Metal Flower Pots,Vertical Pattern Metal Pots,Metal Round White Pot xiacun factory , https://www.xiacunmetal.com
From the morphological point of view, the density of grid structures is higher than that of single-layer lattice shells, and the high-density arrangement of rods leads to high redundancy of the network frame components, and there is a problem of excess bearing capacity, while the single-layer lattice shell has redundant components. There are few or no redundant components, which has a significant impact on the overall buckling performance of the structure.
2.1 The application of aluminum alloy space grid structure in foreign countries The lattice shell structure can be traced back to 1863. The German Schwedler named "the father of the dome" designed and built the former steel lattice shell structure. The earlier grid frame. The structure was built in Germany in 1940, using the Mero system. In recent decades, the space grid structure represented by the shell and the grid has developed rapidly. Compared to the steel grid and reticulated shell structure, the aluminum alloy space grid structure Later, the British “Exploration†dome built in 1951 is an earlier aluminum alloy reticulated shell structure built in the world. With the continuous development of processing technology, improvement of manufacturing processes, continuous innovation of node systems, calculation analysis and design level In addition, aluminum alloy space grid structures are not only used in public buildings such as stadiums, convention centers, and theaters, but also in industrial fields such as large petrochemical product storage tanks, thermal power plant dry coal storage, and sewage treatment plants. It has also been widely promoted and applied. Table 1 lists some representative aluminum alloy space grid structures in foreign countries.
2.2 Application of Aluminum Alloy Spatial Grid Structure in China The application of spatial structure in China began in the 1950s, and the representative one is the Tianjin Sports Stadium roof built in 1956. The bolt ball node system in China is also in the 1970s. The concept of Mero node system has been introduced. Since the 1990s, the application of aluminum alloy space grid structure has gradually increased in China. So far, many parts of the country have been built including shells and grids. Aluminum alloy space grid structure.