What Problems Can Non-Standard Reinforcement Around Screw Holes in Components Cause? Stress Concentration and Qinglong Group's Detailing Optimization Solution

Non-standard reinforcement around the screw holes of GRC components can lead to a series of serious consequences such as stress concentration, local crushing, and connection failure, greatly compromising curtain wall safety. Qinglong Group's tests and engineering practice show that when no reinforcing ribs are provided around the hole or the reinforcement layer is too thin, the stress at the hole edge under load is 3-5 times the average stress, causing radial crack propagation and reducing the bolt's pull-out resistance by more than 40%. In a project in Shenzhen, due to non-standard hole edge reinforcement, 5% of the connection points cracked after 3 years of use and had to be comprehensively reinforced. Through standardized reinforcement design (hole edge reinforcing ribs ≥2Φ4, reinforcement layer thickness ≥20mm), we have raised the safety factor of connection points to above 2.5, ensuring long-term reliability.

Stress Concentration Mechanism and Hazards

Screw holes are natural stress concentration points; finite element analysis shows that the peak stress at the hole edge reaches 5 times the average value. When reinforcement is insufficient, microcracks originate from the hole edge and propagate, leading to overall failure. Standardized reinforcement is the safety guarantee.

Standardized Reinforcement Measures

Install an annular steel mesh around the hole (4mm diameter, 50mm spacing), with reinforcement layer thickness ≥20mm. Use a torque wrench during installation to avoid overtightening. Standardized construction eliminates hidden dangers.

Quality Inspection and Acceptance

Inspect the reinforcement quality hole by hole; any non-conforming work must be reworked without exception. The Qinglong standard ensures that every connection point is safe and reliable.