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Grids, net shell structure is a kind of space truss structure, have the characteristics of the three-dimensional stress, can withstand the role of each direction and space truss structure is commonly high order statically indeterminate structure, if a local failure, only statically indeterminate number reduced, the internal force and distribution can be adjusted again, the whole structure generally is not the failure, has the high security reserves.

The members in the lattice and shell structure are not only stressed members, but also mutually supported members. They work cooperatively, have good integrity and stability, and large space stiffness. They can effectively withstand asymmetric loads, concentrated loads and dynamic loads, and have good aseismic performance.

Under the action of joint load, each bar mainly bears axial tension and pressure, which can give full play to the strength of materials and save steel.

Compared with the lattice shell, the flat lattice shell is a kind of space structure without horizontal thrust or tension, and the bearing structure is relatively simple, generally simply supported bearing can be used, which is convenient for the processing of the lower supporting structure. Due to its structural type, the stress of the lattice shell structure tends to be more reasonable, and can achieve a more beautiful architectural appearance.

The main disadvantages of reticulated shell structure are as follows: the deviation of geometrical dimensions of rods and nodes and the deviation of curved surface have a great influence on the internal force, overall stability and construction accuracy of reticulated shell, which brings some difficulties to the structure design and construction. In order to reduce the initial defects of the reticulated shell structure, the machining accuracy of the rods and nodes is required to be high and the machining difficulty is great. In addition, when the vector height of the reticulated shell is very high, it increases the roofing area and unnecessary internal space of the building, and increases the consumption of building materials and energy. These problems are more prominent in the large span reticulated shell.

Due to the regular structure combination of network frame and shell, the shape and size of a large number of rods and nodes are the same, and the specifications of rods and nodes are less, which is convenient for mass production in the factory, the product quality is high, the site assembly is easier, and the construction speed is fast.

The structure of net frame and net shell not only realizes the construction of large-span structure with smaller size of rod, but also occupies less space and can make more effective use of space, such as arranging various equipment and pipelines in the space between the net frame and the upper and lower strings of multi-layer net shell structure. The plane layout of the lattice and shell structure is flexible, suitable for rectangular, circular, oval, polygon, fan-shaped and other architectural planes, the architectural modeling is novel, light, spectacular, very expressive, deeply favored by architects and owners.