How to select the main steel structure roofing steel material
Just for lightweight frame material results in the establishment of authority bidding information, often seen to show just frame material for the Q345, and the request of high strength materials tender are more and more, to establish the authority of the design strength of materials that the higher the more steel, will be backward engineering cost. This awareness is limited, not a broad rule. Just as the structure and the design frame, not as long as the operation of strength design, operation design and also just a solid design, design elements and unwarranted are relatively simple, similar span, height, seismic intensity, wind load and static load, whether there is a crane, crane tonnage, because the higher the more material strength of steel. This awareness is not one-sided. Normally small and large span load non seismic area construction of the wind, its internal force is larger, strength of grasp, material of high strength steel consumption will decline, the construction cost can be reduced; when the earthquake intensity is high and the wind load is large, large deformation is often made by just grasp, the material strength is again high, also need to maintain the remaining capacity of member section, the residual stiffness of deformation with high strength material request, then instead of building cost will cause unnecessary waste of progress.
In recent years, some areas in Zhejiang Province, often encounter some seismic building design for 8 degrees, and the snow load is larger, the wind load is large, the span between 15-18M, the stiffness of the master, the column deformation is building elements such as the master, the progress of material strength is inappropriate, with Q235.
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