Common methods of steel structure reinforcement

Several methods of steel structure reinforcement in construction engineering are: enlarging the section of original structural members, changing the structure calculation graph, reducing load, preventing crack propagation and so on. However, in addition to these methods, we may have some better, convenient and effective methods in the future under the premise of continuous improvement of technology.

First, increase the original structural component section reinforcement method

The reinforcement of enlarging the section of the member is mainly used to strengthen the steel member by enlarging the section. The section form we choose should be conducive to the need of the reinforcement technology and also consider the existing defects and damage.

Second, change the structure to calculate the graph method

The reinforcement method of changing the calculation figure of the structure mainly refers to the method of strengthening the structure by changing the way of load transmission, distribution, joint properties and boundary conditions, adding additional members and supports, applying prestress and considering the spatial cooperative work. The general reinforcement method of changing the structure calculation graph.

Three, load reduction method

The connection method of steel structure, namely rivets, welds, ordinary bolts and high-strength bolts, should be selected according to the purpose, reason, stress state, structure and construction conditions of the structure to be strengthened, and considering the original connection method of the structure. Steel structure reinforcement should generally adopt welding joint, friction type high strength bolt connection, if there is a basis can also be used welding joint and friction type high strength bolt mixed connection. When welded joints are used, approved welding processes and joint materials shall be used.

Four, prevent crack propagation method

Repair and Reinforcement of Crack When the structure is damaged by the crack with extensibility or brittle fracture tendency due to the repeated action of load and improper material selection, manufacture, construction and installation, it should be repaired. Before repair, it is necessary to analyze the causes of cracks and the severity of their influence, and take targeted measures to improve the actual work of the structure or carry out reinforcement. The components that are not suitable for repair and reinforcement should be removed and replaced.