2025-03-24    91

Design Principles for Reinforcement

1. When a steel structure requires reinforcement as confirmed by reliability assessment, the reinforcement design should comply with relevant standards based on the assessment findings and the property owner's requirements. The scope of reinforcement may encompass the entire building, specific independent sections, or designated structural elements/connections, while maintaining consideration for overall structural stability.

2. The post-reinforcement safety classification of the steel structure shall be jointly determined by the property owner and designers, considering factors including:

• Severity of potential failure consequences

• Structural importance

• Intended service life of the reinforcement design

3. Reinforcement design must:

• Integrate closely with construction methodologies

• Ensure reliable connections between new and existing components

• Achieve integral bonding between added and original sections

• Avoid adverse impacts on unmodified structures, adjacent elements, or foundations

4. Address root causes of structural damage through:

• Preventive measures against high/low temperatures, humidity, freeze-thaw cycles, chemical corrosion, vibrations, thermal stresses, shrinkage stresses, and differential settlement

• Systematic remediation following specified repair sequences

5. Optimize technical-economic efficiency by:

• Avoiding reinforcement of structures with poor repairability

• Minimizing unnecessary demolition or replacement

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6. Include provisional safety protocols in design documentation for structures prone to:

• Tilting

• Instability

• Excessive deformation

• Collapse during reinforcement

Reinforcement Methods & Complementary Technologies

1. Reinforcement approaches fall into two categories:

• Direct reinforcement

• Indirect reinforcement
  Selection shall consider site conditions and functional requirements.

2. Direct reinforcement methods:

• Section enlargement

• Steel plate bonding

• Composite reinforcement

3. Indirect reinforcement methods:

• Structural system modification

• Prestressing techniques

4. Preferred connection methods:

• Welded joints

• Friction-type high-strength bolting

• Hybrid welded/bolted connections

5. Complementary technologies must conform to:

• Standard-compliant connection techniques

• Approved repair/restoration methodologies

This translation maintains technical accuracy while optimizing readability through:

• Logical grouping of related concepts

• Standardized structural engineering terminology

• Clear hierarchical presentation matching original content structure