What is the force characteristics of the foundation of steel structure workshop

The foundation of the steel structure factory building usually adopts a separate foundation, which is designed according to eccentric compression.

For low-height portal rigid-frame steel structure workshops without cranes, the connection between the column feet and the foundation is usually designed by hinged joints. The top surface of the foundation is only subject to the vertical pressure generated by the superstructure and the horizontal force generated by the wind load. The additional eccentric bending moment on the bottom of the foundation caused by the horizontal wind load is small, and the foundation design is relatively simple.

For high-height portal rigid frame steel structure workshops and steel bent structure workshops with bridge cranes, especially when the crane tonnage is large (two 20t cranes or larger for a single span), in order to effectively improve the structure The anti-side movement stiffness is used to control the lateral displacement, and the column feet are usually designed for lateral rigid connection and longitudinal hinged connection. The longitudinal horizontal load on the factory building is transmitted to the top surface of the foundation through the support between the columns. In the lateral direction, because of the light weight of the steel structure and the long natural vibration period of the structure, the horizontal seismic effect is relatively small. The horizontal horizontal load that plays a control role is usually the horizontal braking load of the crane plus the wind formula, and the axial forces of the two rods may not be equal. The formula is based on the theory of elastic stability.