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2.2 Design principle of network frame structure / steel structure space frame

According to the analysis of the design and research results of the current grid structure / steel structure space frame, the design principles are roughly as follows:

First, the network frame structure / steel structure space frame design should comply with the principle of simplification.Because the grid frame structure / steel structure spatial frame is a form of spatial structure with high hyperstatic determination, the internal force and the conduction or evolution of the deformation situation can not be accurately given in the design process, so its design is full of complexity and difficulty.Therefore, domestic and foreign construction industry researchers in the grid structure / steel structure space frame design, usually on the premise of meeting the demand of construction as far as possible simplified grid structure / steel structure space frame each space node stiffness, string deformation calculation, so that the design is not too much, multifarious, and considering the quality of the engineering and the stability of the whole grid space / steel structure space frame.

Secondly, the grid structure / steel structure space frame design should be adhering to the principle of safety.Safety is the lifeblood of the construction industry, especially the network structure / steel structure space frame itself occupies a large space, whether in the design or in the construction stage, all need to undertake a certain high-altitude work, at this time, more strict requirements are put forward for safety.On the one hand, each part of the string rod or belly rod of the grid structure / steel structure space frame should be fixed firmly, and will not undergo substantial deformation due to external forces, so as to ensure the stability of its structure, and ensure that the construction personnel can be in a safe working environment.On the other hand, the calculation of the grid structure / steel structure space frame should comply with the expected design concept, each part of the force value in a good control range, especially the base part of the force should have strong compression ability, to ensure that the whole grid frame structure / steel structure space frame will not occur displacement, affect the construction progress and the production safety work.

2.3 Theoretical basis for network frame structure / steel structure space frame design

(1) Small deformation theory

The theoretical content of small deformation theory is that the deformation of the component itself under the action of internal and external forces is small, and the position after the force does not have obvious displacement, so it is not necessary to consider the second order effect produced by the stress under the position change.In terms of grid structure / steel structure space frame, because its each part of the structure adopts the string and belly rod connection, their internal force under the action of scientific and effective dispersion, so the corresponding force is relatively uniform, finally makes the grid structure / steel structure space frame each component force will not appear significant difference, so it has a strong stability.

(2) Static theory

① two-force balance

The two forces present on a rigid body are of equal sizes and are in opposite directions, and the final sum is 0, namely: F1= -F2. For the deformed body, the two-force equilibrium is a necessary condition but not a sufficient condition.

Principles of ② addition and subtraction of balance force system

Any force system acting on the grid structure, and the addition or removal of any equilibrium force system, will not change the effect of the original force system on the spatial structure.In other words, the effect is the same or close, and different equilibrium forces can achieve equivalent replacement of [1].

3. Development prospect of grid structure / steel structure space frame with large span and large space

3.1 Grid structure / steel structure space frame large span large space structure will be constantly innovated

The integration of prestress technology into the large-span and large-space grid structure / steel structure space frame has become an important way to strengthen the building's own rigidity and seismic resistance.After continuous exploration, Chinese researchers have developed a brand new prestress space structure, which can promote the force transmission more clear.Moreover, with the continuous development and application of Soto structure and cable network structure, the stress state of the grid structure / steel structure space frame is not only changed, and the peak internal force is greatly reduced, and the structural stiffness and the corresponding stability are also enhanced accordingly.Thus, with the continuous development of The Times, the grid structure / steel structure space frame large span and large space structure will be continuously innovated.

3.2 Membrane structure provides a broader space for the application and development of large span space frame / steel structure space frame

Membrane structure is a spatial structure that Chinese researchers are trying to research on rights. In terms of the current actual research results, the tension membrane structure is the more frequently adopted.And this structure is made of glass fiber fabric or polyester fiber fabric for the structure of the foundation layer, after using strong acid and alkali resistance, organic solvent erosion, insoluble in all solvent of pFE as space structure layer material, and combined with steel structure or steel mixed structure and to form a new space structure.Through experiments, the membrane structure further reduces the production cost on the basis of the existing large span and large space grid structure / steel structure space frame, so that the service life of the building is further improved, providing a broader space for its application and development of [2].

Conclusion: to sum up, through the research content, grid structure / steel structure space frame is the mainstream trend of construction industry in the 21st century, its obvious advantages are emerging, so the grid structure / steel structure space frame large span large space application scope will be further expanded, and with the rapid progress of science and technology, it has a broader development space.