1. Introduction: Structural Importance of Corridor Joints
Steel structure corridors are widely used in industrial and public buildings.
They connect multiple buildings for pedestrian and equipment passage.
Angle steel and plate composite joints are common connection forms.
These joints fix corridor beams and columns to form integral structures.
Under seismic loads, joints are the weakest parts of steel corridors.
Poor joint seismic performance leads to deformation or overall collapse.
Seismic performance analysis guides safer joint design and construction.
2. Structural Characteristics of Composite Joints
2.1 Simple and Practical Structure
Combines angle steel support and flat plate connection advantages.
Angle steel provides stable triangular mechanical support.
Steel plates ensure tight connection and uniform force transfer.
2.2 Convenient On-Site Construction
Modular assembly reduces high-altitude welding workload.
Suitable for rapid construction of long-span steel corridors.
Lower processing difficulty compared with integral welded joints.
2.3 Flexible Force Bearing Mode
Bears tension, compression and shear force simultaneously.
Adapts to complex stress changes under earthquake conditions.
3. Common Seismic Failure Modes
3.1 Bolt Loosening and Slippage
Reciprocal seismic vibration causes bolt preload loss.
Joint slippage occurs and destroys structural integrity.
3.2 Local Buckling of Angle Steel
Excessive lateral load leads to angle steel edge buckling.
Reduces joint stiffness and weakens seismic resistance.
3.3 Weld Crack Propagation
Weld seams bear concentrated stress during earthquakes.
Micro cracks expand rapidly and cause joint fracture.
3.4 Plate Torsion Deformation
Uneven force distribution triggers steel plate torsion.
Changes the original force transmission path of the corridor.
4. Key Factors Affecting Seismic Performance
4.1 Joint Stiffness Matching
Mismatched stiffness between angle steel and plates causes stress concentration.
Reasonable thickness matching balances overall joint rigidity.
4.2 Bolt Arrangement Density
Sparse bolt layout reduces anti-slip capacity.
Overly dense bolts cause local material stress superposition.
4.3 Welding Process Quality
Unstandardized welding produces pores and residual stress.
Poor welding quality becomes seismic failure hidden danger.
4.4 Corrosion and Aging Degree
Long-term outdoor operation causes joint surface corrosion.
Corrosion reduces effective bearing area and seismic capacity.
5. Seismic Performance Analysis Methods
5.1 Finite Element Simulation Analysis
Simulate real seismic load and vibration frequency.
Observe joint stress distribution and deformation trend.
Accurately predict weak failure positions.
5.2 Low-Cyclic Repeated Loading Test
Simulate repeated shaking of actual earthquakes.
Test joint ductility, energy dissipation and fatigue resistance.
Obtain reliable seismic performance data.
5.3 On-Site Structural Monitoring
Arrange stress sensors on key joint parts.
Monitor structural response under daily wind and minor vibration.
Evaluate long-term seismic reserve capacity.
6. Practical Seismic Optimization Measures
6.1 Optimize Component Matching
Select matched angle steel and steel plate thickness.
Avoid single component stiffness surplus or deficiency.
6.2 Standardize Bolt Installation
Adopt high-strength anti-loosening bolts for connection.
Control uniform preload to prevent slippage failure.
6.3 Improve Welding Quality
Optimize welding sequence to reduce residual stress.
Repair weld defects and polish stress concentration areas.
6.4 Strengthen Anti-Corrosion Protection
Apply durable anti-corrosion coating on joint surfaces.
Regularly inspect and maintain key connection parts.
7. Conclusion
Angle steel and plate composite joints are widely used in steel structure corridor engineering.
Their seismic performance is affected by structure, construction quality and aging degree.
Common failures include bolt slippage, angle steel buckling and weld cracking.
Through finite element analysis and laboratory tests, engineers can accurately assess seismic performance.
Targeted optimization in structure design and construction greatly improves structural stability.
Standardized joint design and maintenance effectively enhance the overall seismic resistance of steel corridors.
It ensures long-term safe operation of connecting corridor structures in earthquake-prone areas.
The above content was generated by AI assistance.
