What are the reinforcement methods for steel structures?

What are the reinforcement methods for steel structures?

The main methods for strengthening steel structures include:

Reduce the load, change the calculation pattern, increase the cross-section and connection strength of the original structural components, and prevent crack propagation.

When there is mature experience, other reinforcement methods can also be used. Steel structures that have been identified as requiring reinforcement are generally divided into local reinforcement and comprehensive reinforcement based on the extent of damage.

Local reinforcement refers to the reinforcement of a member or connection node with insufficient load-bearing capacity. There are methods such as increasing the section of the member, reducing the free length of the member, and strengthening the connection node.

Comprehensive reinforcement refers to the reinforcement of the overall structure, which can be divided into two types: reinforcement without changing the static calculation pattern of the structure and reinforcement with changing the static calculation pattern of the structure.

Adding or strengthening support systems is also an effective method for strengthening structural systems.

The reinforcement method of increasing the cross-section of the original component is the most material and labor-intensive method (but often feasible); The method of changing the calculation diagram is the most effective and diverse, and its cost is also greatly reduced

1、 Before determining the reinforcement plan, the following information should be collected:

(1) As-built drawings (including modified drawings) and acceptance records of the original structure.

(2) Copy of original steel material report or on-site material inspection report.

(3) Record of production, installation and acceptance of original structural components.

(4) Original structural design calculations.

(5) Inspection report on structural or component damage.

(6) Data on existing actual loads and newly added loads after reinforcement.

2、 The Main Factors of Steel Structure Damage and Strengthening Technical Measures

2.1 The main factors causing damage to steel structures include:

(1) Insufficient structural bearing capacity due to changes in load, extended service, and changes in specifications and regulations;

(2) Due to various unexpected deformations, twists, disabilities, depressions, etc., the components weaken their cross-section, cause member warping, and cause connection cracking;

(3) Deformation, cracking, and warping of components or connections caused by temperature difference;

(4) Corrosion caused by chemical erosion and electrochemical corrosion resulting in weakened cross-section of steel structural components;

(5) Other issues include errors in design, production, and construction, as well as unauthorized use and operation during service. This article is sourced from the Steel Structure Alliance

There are mainly three types of reinforcement technical measures for steel structures:

(1) Section reinforcement method: Steel reinforcement is used locally or along the entire length of the component, connecting it into a whole to jointly bear the force;

(2) Change the calculation diagram: add additional supports, adjust the load distribution, reduce the internal force level, force displacement on the statically indeterminate structural supports, and reduce the peak stress;

(3) Prestressed cable method: Use high-strength cables to strengthen weak links in the structure or improve the overall bearing capacity, stiffness, and stability of the structure.

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