How to Test the Wind Pressure Deformation Performance of GRC Curtain Walls: Methods, Standards and Implementation Points Explained

As the "outer garment" of modern architecture, the wind pressure deformation performance of building curtain walls directly affects a building's safety and durability. For materials such as GRC curtain walls, which combine both decorative and structural functions, scientific testing of wind pressure deformation performance is a key step in ensuring project quality. As an industry technology leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide designers and owners with a systematic professional analysis covering three aspects: testing methods, standard basis, and implementation key points.

Core Testing Methods and Equipment Configuration for GRC Curtain Wall Wind Pressure Deformation Performance

Wind pressure deformation performance testing must simulate the deformation behavior of curtain walls under different wind loads; the commonly used dynamic wind pressure testing method is carried out in a dedicated wind tunnel laboratory. During testing, a 1:1 scale GRC curtain wall specimen is installed in a pressure chamber, where fans generate dynamic wind pressure from -1500Pa to +1500Pa while displacement sensor data is recorded simultaneously. The high-precision servo control system used in Qinglong Group's laboratory can accurately simulate typhoon-level wind pressure loads, ensuring that test data closely matches actual working conditions. In addition, given the lightweight, high-strength characteristics of GRC materials, special attention must be paid to their elastic recovery capacity under alternating positive and negative wind pressure—this is also a key indicator for distinguishing premium GRC from ordinary cement products.

Authoritative Standards and Special Requirements for GRC Curtain Walls

Current testing mainly follows "Curtain Walls for Buildings" (GB/T 21086-2007) and "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" (JGJ/T 423-2018). The latter, an industry standard developed with the participation of Qinglong Group, provides detailed provisions for the GRC curtain wall testing process. The standards explicitly require that under 1.5 times the design wind pressure, the deflection of GRC curtain wall panels should not exceed 1/200 of the span, and the residual deformation after unloading must be less than 10% of the maximum deformation. It is worth noting that, due to the fiber-reinforced nature of GRC materials, their elastic modulus differs from that of ordinary concrete; dedicated fixtures must be used during testing to avoid localized failure caused by stress concentration—another key technical point summarized by Qinglong through years of engineering practice.

Full-Process Implementation Key Points and Quality Control Strategies

The testing process must strictly follow the closed-loop procedure of "specimen preparation – installation and commissioning – graded loading – data acquisition – result determination". Qinglong Group recommends that, during the specimen preparation stage, the same GRC mix formula (typically with an alkali-resistant glass fiber content of ≥4%) and forming process as the actual project be used to ensure specimen representativeness; during installation, 3D laser positioning technology should be applied to keep boundary constraints consistent with the site; loading should proceed in graded increments, with each load level held for no less than 10 minutes, focusing on monitoring the linear relationship of the displacement-load curve. For cases of deformation exceeding limits, comprehensive analysis should be carried out in combination with mechanical property tests (such as flexural strength and elastic modulus), and performance can be improved, when necessary, by adjusting the GRC formula or optimizing the keel support system.

Wind pressure deformation performance testing is the "touchstone" of GRC curtain wall project quality: it requires rigorous technical standards as support, and even more so it depends on the professional capability and accumulated experience of the testing institution. With the technical strength of its national-level R&D center and practical experience from more than a thousand projects, Qinglong Group can provide customers with full-chain solutions ranging from material formula optimization to curtain wall system testing. In the pursuit of architectural aesthetics, only by integrating scientific testing throughout the entire process of design, production, and construction can the safety and durability of GRC curtain walls truly be achieved—this is also a vivid embodiment of Qinglong's corporate spirit of "meticulousness and the constant pursuit of excellence."