Steel structure workshops generally require a large space due to the key points of the process layout. The structure usually adopts a frame structure. Frame-shear structure can also be adopted when the number of floors is large and the process conditions permit.
The principle of structural arrangement is: try to make the column network symmetrical and evenly arranged so that the rigidity center of the house layer is close to the center of mass to reduce the space torsion effect of the house layer. The structural system requires simple, regular and clear torque to avoid stress concentration. And the concave angle and contraction of deformation and sudden change, and the outer picking and inward drawing with too much vertical change, and strive to keep the rigidity along the vertical direction without sudden change or less sudden change. Due to the large span direction of the multi-storey factory building, the number of columns is small, and the size of the column spacing is small. Generally, it is controlled horizontally, so that the seismic capacity in vertical and horizontal directions is roughly the same.
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The site selection of the plant design is very important. Because the earthquake zone is avoided as much as possible, the expansion joints of the earthquake zone are integrated. When the house is long, the following structural measures and construction measures should be adopted to avoid the establishment of expansion joints and earthquake-proof joints. During construction, a post-pouring zone of 800mm and a width of 1400mm is set every 40m. The post-pouring zone is located in the section where the structure is least affected by the force. The top floor, bottom layer, gable and inner longitudinal wall are spaced apart from the temperature. For the walls and other parts of the building, appropriately increase the reinforcement ratio, thicken the thermal insulation layer or set the overhead layer to form a ventilation layer.
The fire resistance of steel structure industrial plants is very poor. When the steel is heated above 100°C, as the temperature rises, the tensile strength of the steel decreases and the plasticity increases. When the temperature is about 250°C, the tensile strength of the steel is slightly There is an increase, but the plasticity is reduced, and blue brittleness appears. When the temperature exceeds 250°C, the steel appears to creep. When the temperature reaches 500°C, the strength of the steel drops to a very low level, causing the steel structure to collapse. Therefore, the steel structure must be designed for heat insulation and fire protection.
Correctly define the fire hazard type of building production, and reasonably determine the fire resistance level of the building. According to the “Code for Fire Protection Design of Buildings”, the fire hazard of plant production is divided into five categories: A, B, C, D, and E. If the project is determined to be Class II The fire resistance level should be protected by applying fire-resistant coatings in strict accordance with the second-level fire-resistance level, so that the steel components reach the fire-resistant limit requirements when the second-level fire resistance level is reached.