Method of reinforcement design for steel structure
The reliability evaluation of steel structure needs to be strengthened, should be based on the reliability appraisal conclusion and the client's request, professional and technical personnel in accordance with the requirements of national standard reinforcement design and reinforcement design, content and scope, can be a whole structure, can also be a local structure, specific components or parts.
For steel structure reinforcement design, attention should be paid to reinforcement design and construction methods. Effective measures should be taken to ensure reliable connection between new sections, components and components and original structure, so as to form an overall work together so as to avoid adverse effects on unreinforced parts or components.
Generally, the main methods of steel structure reinforcement are to reduce the load, to change the calculation figure, to increase the cross section and connection strength of the original structural members and to prevent the crack growth. Other methods can be used to reinforce the steel structure when it has mature experience.
To change the structure calculation graphics reinforcement method: to change the load distribution, transmission way, node properties and boundary conditions, add additional rods and braces, pre stress, and consider the spatial coordination work to reinforce the structure.
1, the structure can be used to increase the support form: space structure and space structure according to the calculation, additional support structure stiffness increases, or adjust the frequency of the structure to improve the dynamic characteristics, and improve the structure of additional support or auxiliary rod structure of the slenderness ratio is reduced to improve the stability, on the shelf in the structure of a strengthened columns stiffness of bearing structure, which carry most of the horizontal forces, in order to reduce the load on the tower and other columns in the structures of moderate tension rod set or cable to strengthen the stiffness of the structure.
2, the bending rod can be used: to change the distribution of loads, such as a concentrated load is converted into a plurality of concentrated load, change of end conditions, such as variable hinged node, intermediate support or just increase will simply supported structure is connected with the end of a continuous structure, continuous adjustment of structure bearing position, will the structure becomes the strut structure, prestress. The method of changing the internal force of the cross section is strengthened.
The reinforcement method of reinforced component section involves extensive surface and simple construction. Under certain conditions, construction can be carried out under the condition of load. The main method is sticking steel reinforcement. When adopting this method to strengthen the steel structure, we should take into account the stress condition of the members and the defects of the structure itself. Under the premise of convenient construction, we should choose the most effective way to increase the cross section connection so as to achieve the effect of reinforcement.
Repair and reinforcement of cracks: the structure should be repaired due to repeated actions of load and material selection, construction, manufacture and improper installation. Before repair, we must analyze the cause of the cracks and the severity of the impact. We should take measures to improve the actual work or reinforce the structure, and we should replace the components that are not suitable for repair and reinforcement.
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