What are the requirements for the foundation of steel structure buildings?
The foundation selection of steel structure buildings mainly focuses on its bearing layer. For some high steel structure buildings, the foundation slab or pile end should go deep into the supporting layer. Therefore, natural foundation and artificial foundation cannot be adopted for the foundation of the same structural unit, and more than two soil layers with large differences in properties cannot be adopted as the foundation. Sometimes, in order to prevent uneven ground settlement, the foundation will be deepened or the pile length will be increased.
Steel structure buildings can overcome various geological environments and ensure their excellent windproof and seismic performance.
Steel structure buildings, especially light steel structure buildings, can not be affected by any geological environment. Whether in wetlands or arid areas, the best construction conditions can be achieved through construction to save construction time. Due to the excellent seismic performance of steel structure buildings, many steel structure buildings can be seen in some earthquake prone areas. The whole installation process is convenient and the protection effect is good. However, some targeted foundation stability measures need to be taken to strengthen the integrity of the foundation. There may be liquefied soil layer within the foundation retaining layer in the area with high earthquake incidence. Certain measures must be taken to eliminate the adverse impact of soil layer liquefaction on the superstructure.
The following measures can be taken to eliminate the adverse impact of liquefaction settlement of foundation soil layer on steel structure buildings:
1. When the steel structure building adopts pile foundation, the length of the pile end extending into the stable soil layer below the liquefaction depth shall be determined according to the calculation of the bearing capacity of the pile, and all liquefiable soil layers shall be excavated within the scope of the foundation support layer.
2. Densification method can be used to eliminate the adverse effects of soil liquefaction, such as sand pile extrusion method, dynamic compaction method, vibroflotation method, etc., so as to ensure the lower interface treatment of soil liquefaction depth.
