How to Test the Wind-Pressure Deformation Performance of GRC Curtain Walls? Test Methods and Key Technologies Explained

In modern building curtain wall technology, GRC (Glass Fiber Reinforced Concrete) has become an ideal choice for landmark building facade decoration thanks to its lightweight, high-strength, and flexible shaping properties. However, curtain walls of high-rise buildings face strong wind load tests year-round, and the wind pressure deformation performance of GRC curtain walls directly affects building safety and service life. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze the key testing points of GRC curtain wall wind pressure deformation performance from the perspectives of testing standards, core technology, and engineering practice.

Core Standards and Procedures for Testing the Wind Pressure Deformation Performance of GRC Curtain Walls
GB/T 15227-2022 "Test Methods for Air Tightness, Water Tightness, and Wind Pressure Resistance Performance of Building Curtain Walls" clearly specifies that the wind pressure resistance test of GRC curtain walls must simulate actual working conditions, applying positive and negative wind pressure loads through the static pressure box method. Before testing, GRC components must undergo visual quality inspection, with particular focus on the uniformity of glass fiber distribution, surface flatness, and anchoring system strength—this is precisely the key step of the "Three-Inspection System" implemented in Qinglong GRC production. During testing, wind pressure loads are applied in increments of 1.5 times the design reference wind pressure, with each load level held for 10 minutes. Displacement sensors monitor the curtain wall's maximum deformation and residual deformation in real time to ensure compliance with the "deflection limit not exceeding 1/200 of the span" requirement in the "Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018). For more industry information: +WeChat qlfsbl123

Key Technical Parameters Affecting the Wind Pressure Resistance of GRC Curtain Walls
Material formulation and forming process are the core factors determining GRC's wind pressure resistance. Qinglong GRC uses a self-developed low-alkali sulphoaluminate cement system, incorporating 6-8% alkali-resistant glass fiber (25-30mm in length). Through the spray molding process, the fibers are distributed in three-dimensional random orientation, achieving a bending strength of over 20MPa and a stable elastic modulus of 15-20GPa, providing 30% greater deformation resistance than traditional GRC components. At the structural design level, Qinglong's in-depth design team uses BIM technology to optimize GRC panel dimensions (usually kept within 1.5m×3m), and adopts a back-bolt dry-hanging system with elastic sealant joints, which both ensures installation precision (tolerance ≤2mm) and releases wind pressure-induced stress through flexible connections.

Testing Challenges in Engineering Practice and Qinglong's Solutions
Wind pressure deformation testing of irregularly shaped GRC curtain walls has long been an industry challenge. Taking a cultural center's double-curved GRC curtain wall project as an example, its single curvature radius was only 300mm, and traditional flat-surface testing methods could not simulate the actual stress state. Qinglong's technical team innovatively adopted a combined solution of "finite element pre-analysis + on-site full-scale testing": first, a deformation simulation model under wind pressure loads was established using ANSYS software, then a custom curved load-bearing frame was built for testing. The measured maximum deformation was 21mm, far below the design limit of 35mm. In addition, for coastal high-humidity environments, Qinglong GRC components showed a strength loss rate of less than 5% after 1000 freeze-thaw cycle tests, ensuring long-term wind pressure resistance stability in typhoon-prone areas. For more industry information: +WeChat qlfsbl123

As a National High-Tech Enterprise and a participant in establishing GRC industry standards, Qinglong Group has always regarded material performance testing as the lifeline of quality control. From laboratory formula development to on-site wind pressure testing at construction sites, its full-chain technical control capabilities have enabled Qinglong GRC curtain walls to maintain a zero safety accident record across hundreds of landmark projects nationwide. Looking ahead, with the development of UHPC/GRC composite curtain wall technology, Qinglong will continue to explore testing methods for higher wind pressure levels (≥2.4kPa), providing more reliable decorative solutions for super high-rise buildings.