frame

Stress Analysis of space frame Structure Processing in High-Temperature Environment

At room temperature, due to the regular form of the steel structure space frame processing building space frame structure unit, the space connection is tight, the overall stability is good, and the overall collapse will not occur due to the damage of local rods. However, at high temperatures, the space frame members will expand due to the rise of temperature, and the mechanical performance and structural stability will change. Then in the high-temperature environment, what kind of changes will occur in the steel structure space frame processing galvanized steel warehouse building?

1. Temperature field factors

The location of the fire and its propagation path have a great influence on the distribution of the temperature field, and the temperature will directly affect the material properties. Since the fire burns along the exterior decoration materials, the temperature of the outer network frame is higher than that of the inner layer network frame, and the temperature of the right edge member is higher than that of the mid-span member. This results in a larger internal force value of the member at the right outer edge.

2. Material factors

The increase in temperature leads to a significant decrease in the stiffness and strength of the material. Under the same load, the reduction of stiffness will increase the deformation of the member, and the excess deformation will increase the additional internal force of the member.

3. Constraint reasons

Steel building space frame structure processing For statically indeterminate structures, the temperature effect cannot be ignored. For the rods in the middle of the structure, due to the weak constraints of the support, they can expand and contract to a certain extent under the action of temperature. And this property will reduce the increase of the additional internal force of the rod, and the material will also reduce the influence of the excess internal force.

However, the rods at the edge of the space frame close to the support have a relatively large restraint stiffness. During the expansion process of the rods of the steel structure space frame processing building, they cannot be released through expansion and contraction, which will cause the internal force of the rod section to continue to accumulate, resulting in excessive local stress. big phenomenon. This causes some rods connected to the fixed support to have relatively large deflection values, which in turn seriously affects the local bearing capacity of the space frame.