How to Test the Wind Pressure Deformation Performance of GRC Curtain Walls — Testing Methods and Standards Explained

In modern building curtain wall projects, GRC (Glass Fiber Reinforced Concrete) has become the preferred material for landmark buildings and high-end commercial complexes thanks to its lightweight, high-strength properties and flexible styling. However, as the building's "outer garment," a curtain wall's wind pressure deformation performance directly affects building safety and service life. As an industry technology leader 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 three dimensions—testing standards, core methods, and engineering practice—providing professional technical reference for designers and owners.

I. Standard System and Core Indicators for GRC Curtain Wall Wind Pressure Deformation Performance Testing

Wind pressure deformation performance testing must strictly comply with standards such as "Building Curtain Walls" (GB/T 21086-2007) and "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T 423-2018). Core testing indicators include:
1. Deformation test: Under graded wind pressure, the maximum surface normal displacement of the curtain wall must be ≤L/180 (L is the support spacing), with an elastic recovery rate ≥90%;
2. Load-bearing capacity test: When wind pressure reaches 1.5 times the design value, curtain wall components must exhibit no plastic deformation such as cracking or connection failure;
3. Air tightness test: Air permeability performance is tested in parallel to ensure that building energy efficiency and waterproofing requirements are met under positive and negative pressure differentials.
As a participating unit in the development of the JGJ/T 423-2018 standard, Qinglong Group's laboratory is equipped with a 3,000㎡ full-scale curtain wall testing platform capable of simulating force-12 typhoon wind pressure conditions, providing GRC curtain walls with full-dimensional testing services covering everything from material performance to structural loading.

II. Three Testing Methods and Technical Key Points for GRC Curtain Wall Wind Pressure Deformation Performance

1. Static Wind Pressure Testing: Simulating Constant Wind Load Effects
This method applies graded, progressively increasing wind pressure (typically from 1kPa to 5kPa) to curtain wall specimens via air bags or a static pressure box, using displacement sensors to monitor panel and support structure deformation in real time. In the Dongguan Women and Children's Activity Center project, Qinglong's technical team used this method to verify that the elastic deformation of the hyperbolic GRC curtain wall under ±4kPa wind pressure was controlled within 2.3mm, far outperforming the code limit. During testing, note that:
- Specimen dimensions should be ≥1.5m×1.5m and include typical joints and connection details;
- The loading rate should be controlled at 0.1kPa/min to prevent impact loads from compromising data accuracy.

2. Dynamic Wind Pressure Testing: Reproducing Gust Load Effects
For projects in typhoon-prone regions, servo-hydraulic systems are required to simulate pulsating wind pressure (e.g., sinusoidal loads at a 10Hz frequency). Qinglong's dynamic testing equipment at its Nanning production base delivers instantaneous wind pressure loading from 0 to 10kPa, precisely capturing the resonance frequency and fatigue performance of GRC components under gust loads. In the Nanjing East Road Century Plaza renovation project, this testing confirmed that the translucent GRC and UHPC composite curtain wall showed no performance degradation after 100,000 load cycles.

3. On-Site In-Situ Testing: Verifying Actual Installation Performance
For completed projects, fan-based on-site pressurization can be used for sampling inspections. Qinglong's proprietary "3D laser scanning + wind pressure monitoring" technology compares actual deformation against design values via BIM models without damaging the curtain wall structure. In an overseas airport project, this technology successfully identified wind pressure stress concentration caused by installation angle deviations of local GRC hangers; after fine adjustment, deformation was reduced by 40%.

III. Full-Chain Solutions for Ensuring GRC Curtain Wall Wind Pressure Performance

Excellent wind pressure deformation performance depends not only on testing, but also on systematic control from material formulation to construction techniques. Qinglong Group builds its performance assurance system through three key measures:
1. Material optimization: High elastic modulus glass fibers (content ≥5%) combined with a low-shrinkage cement matrix raise the flexural strength of GRC panels to above 25MPa;
2. Structural design: Parametric modeling is used to optimize support spacing, while aluminum alloy combination hangers enable three-dimensional adjustment to absorb wind pressure deformation stresses;
3. Construction control: BIM-based pre-assembly and on-site torque wrenches control bolt preload, ensuring that every connection node meets design load requirements.

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a member of the International GRC Association, Qinglong Group has always pursued the mission of "creating beautiful architecture," transforming 28 years of engineering experience into technical standards and solutions. Whether for super high-rise landmarks or complex curved buildings, Qinglong GRC curtain walls—through scientific testing and systematic design—meet wind pressure deformation performance requirements while achieving a perfect unity of architectural art and structural safety. Choosing a supplier with full-chain service capabilities is the key to ensuring the long-term stable performance of GRC curtain walls.