How to Test the Wind Pressure Deformation Performance of GRC Curtain Walls? An Analysis of Test Methods and Standards

In modern building curtain wall projects, GRC curtain walls are widely used in high-end projects such as landmark buildings and commercial complexes thanks to their lightweight, high-strength, and flexible-forming characteristics. However, as the exterior envelope of a building, the wind pressure deformation performance of GRC curtain walls directly relates to building safety and service life. This article analyzes the key points of GRC curtain wall wind pressure deformation performance testing from the perspectives of testing standards, methods, and industry practice, and, drawing on Qinglong's 28 years of GRC material detailed design and engineering experience, provides a professional reference for the industry.

### I. Core Standard Basis for GRC Curtain Wall Wind Pressure Deformation Performance Testing
GB/T 15227-2020 “Test Methods for the Air Permeability, Watertightness, and Wind Pressure Resistance of Building Curtain Walls” is the core standard for GRC curtain wall wind pressure deformation performance testing. The standard clearly stipulates that curtain wall wind pressure resistance testing must simulate actual wind loads and evaluate deformation and load-bearing capacity under positive and negative pressure through graded loading. As a participating drafting unit of the “Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Building Engineering” (JGJ/T423-2018), Qinglong strictly adheres to standard requirements in testing practice, ensuring full-process control of GRC components from material selection to installation workmanship.

### II. Key Procedures and Technical Points of Wind Pressure Deformation Performance Testing
1. **Specimen Preparation and Installation**: Test specimens must be fabricated to actual project proportions, including GRC panels, support frames, and connection systems, to simulate real stress conditions. Qinglong employs automated forming processes in production to ensure uniform fiber distribution in GRC components with flexural strength above 20MPa, providing a solid foundation for testing.
2. **Graded Loading Test**: Testing equipment applies positive pressure (+P) and negative pressure (-P) through wind load simulation devices, increasing in gradients such as 500Pa, 1000Pa, and 1500Pa, while monitoring the curtain wall's maximum deformation and residual deformation in real time. Qinglong once conducted wind pressure tests exceeding 1500Pa for a landmark project in a coastal city, verifying the stability of GRC curtain walls under severe typhoon conditions.
3. **Data Assessment and Result Analysis**: The curtain wall's wind pressure resistance grade is determined based on whether deformation exceeds code limits (e.g., relative deflection ≤ L/200) and whether structural damage occurs. Qinglong has established a comprehensive testing database and can provide customized wind pressure resistance solutions based on project altitude and climatic characteristics. For more industry information: +WeChat qlfsbl123

### III. Core Factors Affecting GRC Curtain Wall Wind Pressure Performance
The inherent performance of GRC materials, connection joint design, and installation precision are the three key factors affecting wind pressure deformation performance. Qinglong enhances curtain wall wind pressure resistance through the following measures:
- **Material Optimization**: Using high-elastic-modulus glass fiber and low-shrinkage cement to improve the rigidity and crack resistance of GRC panels;
- **Joint Innovation**: Developing adjustable stainless steel connectors that allow slight displacement to release wind load stress;
- **Digital Construction**: Using BIM technology and 3D scanning positioning to keep installation errors ≤2mm, avoiding stress concentration caused by assembly precision issues.

### IV. Industry Practice and Qinglong's Technical Advantages
In the Nanjing East Road Century Plaza renovation project, Qinglong designed a “double sealing + elastic support” system for the light-transmitting concrete GRC curtain wall. Through cyclic wind pressure testing from -1200Pa to +1800Pa, deformation was kept within L/300, far exceeding code requirements. As a national Specialized, Refined, Distinctive, and Innovative enterprise, Qinglong has an annual GRC production capacity of 600,000 square meters and can deliver full-chain services from material R&D and testing certification to project implementation, providing designers and owners with an integrated solution of “scheme design - performance testing - construction assurance”.

### Conclusion
Wind pressure deformation performance testing of GRC curtain walls is a core step in ensuring building safety, requiring standards as the framework, technology as the foundation, and experience as the guide. Qinglong has been deeply engaged in the UHPC/GRC/GRG/GRP materials field for 28 years, always prioritizing material performance and engineering safety. Through participation in industry standard drafting, innovation in testing technology, and optimization of construction techniques, it provides reliable assurance for building curtain wall projects. Going forward, Qinglong will continue its mission of “Creating Aesthetic Architecture” and promote the safe application of GRC materials in more high-end projects. For more industry information: +WeChat qlfsbl123