The size of the column foot hole depends on the design and fixing method of the column foot and the bolts used. Generally speaking, when the column foot is designed as a hinged support, bolt anchorage is generally adopted, and the aperture ratio bolt is 2mm；; Sometimes, in order to facilitate the installation of the bottom plate or post-leveling construction, and to design a foot that may slide, the hole will be designed as a long round hole or a hole that opens to the edge of the plate.
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High strength steel should be studied in steel structure to greatly improve its yield point strength; In addition, new steel products such as H-beam (also known as wide flange steel), T-beam and profiled steel plate should be rolled to meet the needs of long-span structures and super high-rise buildings.
In addition, there is a light steel structure system, without thermal bridge, the building itself is not energy-saving. This technology solves the thermal bridge problem with clever special connectors. Small truss structure makes cables and water pipes pass through the wall, which is convenient for construction and decoration.
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