Analysis of Temperature Stress and Support Constraints on Steel Structure Space Frame

Steel structure space frame is commonly used in industrial and civil buildings, exhibition venues and other fields, which is highly favored because of its good structural performance, short construction period and other advantages. However, in the process of use, due to the influence of external factors, such as high temperature, low temperature, storms and other natural disasters, the steel structure space frame may be affected by temperature stress and support constraints, and thus produce different degrees of deformation or damage. In this paper, we will discuss the influence of temperature stress and support constraint on steel structure space frame, and analyze its causes and countermeasures.

1.Influence of Temperature Stress on Steel space Frame

1.1 Introduction of Temperature Stress

Temperature stress refers to the internal stress of an object caused by temperature change. Steel space frame is usually composed of various components made of different materials, and the linear expansion coefficient of each component is different, so when subjected to temperature change, internal stresses will be generated between different components due to the difference of linear expansion coefficient. When the temperature change is large, these stresses may lead to deformation or destruction of the components.

1.2 Influence of Temperature Stress on Steel Structural Grid

When steel structural grid is affected by high or low temperature environment, its members will be deformed and twisted to different degrees due to internal stress. The steel structure net frame components affected by high temperature for a long time will have annealing phenomenon, lose the original strength, and be easy to rupture in the next time when they are subjected to stress. And in the low temperature environment, the steel will become more fragile, easy to tear, cracks and other phenomena.

The deformation or damage of steel structure net frame will not only affect its normal use, but also may jeopardize the life safety of the surrounding people. Therefore, it is necessary to fully consider and analyze the steel structure net frame and formulate appropriate countermeasures.

1.3 Countermeasures

In order to reduce the influence of temperature stress on steel structure space frame, the following measures can be taken:

(1) Strengthen the selection of material and choose steel with good performance of high temperature resistance and low temperature resistance.

(2) For the components that may face high temperature environment, take heat dissipation measures to reduce their surface temperature.

(3) When designing, give full consideration to the influence of temperature change on the members and strengthen the connection between the members to improve the deformation resistance of the whole.

2.Influence of Support Constraint on Steel Space Frame

2.1 Introduction of support constraint

In steel space frame, support constraint refers to the support constraint provided by the support point or other additional parts in which the steel space frame members are located after installation. Its purpose is to ensure that the members do not undergo large displacement or tipping, so as to ensure the overall stability of the steel space frame.

Since the bearing point is located at the fixed point of the steel space frame, the restraint at the articulation point is smaller than that at the fixed point. And different supporting methods will also lead to the rack.

2.2 Effects of Support Constraints on Steel Structure Space Frame

Insufficient support constraints will lead to the deformation of steel structural grid frame members by extra loads, which is easy to cause the overall instability of the steel structure space frame. Excessive support constraint will limit the free deformation of the members and produce excessive internal stress, which will also easily lead to deformation or even damage of the members.

2.3 Countermeasures

(1) When designing the steel structure space frame, suitable supporting methods must be selected according to specific conditions and reasonably arranged to avoid problems caused by insufficient supporting points.

(2) During the installation process, the design requirements should be strictly followed, and suitable supporting measures should be taken to ensure the constraint of each supporting point on steel structure space frame.

(3) For the existing support problems, timely measures should be taken to adjust to ensure the overall stability of the steel space frame.

Conclusion

In summary, the influence of temperature stress and support constraint on steel structure space frame should not be neglected. Effective measures should be taken according to the specific conditions to ensure the overall stability of steel structure grid frame. Only through continuous research and practice can the operational safety and quality of steel structure space frame be better ensured.