How to Test Wind Pressure Deformation Performance of GRC Curtain Walls: Methods, Standards, and Key Practical Points

In modern building curtain wall systems, GRC curtain walls have become the ideal choice for landmark buildings and high-end commercial complexes thanks to their lightweight, high-strength, and flexible formability. However, in the face of complex climatic environments, wind pressure deformation performance, as a core indicator of curtain wall safety, directly affects a building's structural stability and service life. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will systematically analyze the scientific testing path for GRC curtain wall wind pressure deformation performance from three dimensions—testing methods, standard basis, and practical key points—providing professional technical reference for designers and owners.

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

Wind pressure deformation performance testing essentially simulates the structural response of a curtain wall under wind loads, with its core lying in evaluating the elastic deformation and ultimate load-bearing capacity of components through dynamic pressure testing. The mainstream testing method adopts the dynamic wind pressure chamber method, applying stepwise increasing wind pressure loads (typically from 1.5 kPa to 5.0 kPa) to full-scale (1:1) GRC curtain wall specimens through wind tunnel equipment with adjustable wind speed, while simultaneously monitoring displacement and residual deformation. The fully automatic wind pressure testing system equipped at Qinglong Group's Guangxi production base enables precise simulation of level 0-10 wind pressures. Combined with laser displacement sensors (accuracy up to 0.01 mm) and strain gauge arrays, it collects key data such as panel deflection and connection joint stresses in real time, ensuring the objectivity and traceability of test results.

Analysis of the Industry Standard Framework and Key Technical Indicators

Domestic GRC curtain wall testing strictly follows the dual specifications of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T 423-2018) and Curtain Walls for Buildings (GB/T 21086-2007). The standards clearly require that under design wind pressure, the relative deflection of GRC panels shall not exceed 1/200 of the span, and the residual deformation after unloading must be less than 10% of the maximum deformation. Taking the General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components (Plan No. 2024-0232T-JC), which Qinglong participated in drafting, as an example, a fatigue performance testing requirement was specifically added for large-span GRC curtain walls—panels must withstand 100,000 cycles of alternating wind pressure (0.5 times the design wind pressure) without any cracking. The formulation and enforcement of these standards build a scientific barrier for the safe application of GRC curtain walls.

Key Points of Testing Optimization and Quality Control in Engineering Practice

In actual testing, the representativeness of specimens and installation workmanship directly affect the validity of results. Qinglong Group ensures testing quality through three key measures: first, it adopts BIM parametric modeling technology to precisely replicate the actual curtain wall framing and connection details of the project, ensuring consistency between specimens and on-site conditions; second, GRC panels undergo pre-curing treatment (28 days of standard curing + 14 days of natural curing) to eliminate the interference of early shrinkage stress on test results; third, it innovatively adopts a "dual-camera synchronized shooting" technology, combined with the Digital Image Correlation (DIC) method to capture full-field panel deformation, overcoming the limitations of traditional single-point monitoring. For example, in a certain landmark project, this technology revealed stress concentration in the corner areas, allowing timely optimization of the rib layout scheme and improving wind pressure deformation performance by 23%.

As a national high-tech enterprise and a core participant in the formulation of GRC industry standards, Qinglong Group has always regarded testing technology innovation as a key link in quality control. From wind pressure simulation analysis at the detailed design stage, to full inspection of material performance during production, and then to joint commissioning of the curtain wall system before construction, it has established a quality control system covering the entire "design-production-installation" chain. Looking ahead, as super high-rise buildings place higher demands on curtain wall performance, Qinglong will continue to explore wind pressure performance optimization technologies for UHPC and GRC composite curtain walls, and with the craftsmanship spirit of "meticulous and striving for excellence," provide more valuable solutions for global architectural aesthetics and structural safety.