How to Solve Thermal Stress in Large-Area GRC Curtain Walls: Technical Approaches and Engineering Practice Analysis

How Large-Area GRC Curtain Walls Solve Thermal Stress Issues: Technical Approaches and Engineering Practice Analysis

In modern architectural design, GRC (Glass Fiber Reinforced Concrete) has become an ideal choice for large public building curtain walls thanks to its advantages such as light weight, high strength, and flexible shaping. However, when a GRC curtain wall exceeds 1,000 square meters, the thermal expansion and contraction stresses caused by temperature changes can easily lead to problems such as component cracking and anchor loosening. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has successfully resolved thermal stress challenges in 200+ large domestic projects through three technical approaches: in-depth design, material optimization, and construction innovation.

I. Material Formulation and Structural Design: Controlling Temperature Sensitivity at the Source

Thermal stress control in GRC curtain walls must start with the materials themselves. Qinglong's R&D team adjusted the quartz sand gradation, optimized glass fiber content (4.5%–6%), and added polyacrylonitrile fibers, keeping the linear expansion coefficient of GRC panels within 8×10⁻⁶/℃—a 20% reduction compared with traditional formulations. In structural design, a "unitized modular" approach breaks the super-large curtain wall into standard 1.5m×3m units, with 15–20mm expansion joints reserved between units and filled with elastic sealant (Shore hardness 60±5), which both meets the shaping requirements and releases thermal deformation. In a provincial capital culture and art center project, this solution achieved zero cracking on a 5,000㎡ double-curved GRC curtain wall under a ±40℃ temperature difference. For more industry information, add WeChat: qlfsbl123.

II. BIM Technology and Dynamic Simulation: Full-Cycle Stress Monitoring

Leveraging the advantages of its provincial engineering technology center, Qinglong combines BIM technology with finite element analysis to establish coupled temperature field–stress field models. During the in-depth design phase, it simulates the impact of annual temperature variations (-15℃ to 70℃) on the curtain wall system, with a focus on optimizing stress concentration areas such as internal and external corners and keel connections. During construction, 3D laser scanning positioning (accuracy ±2mm) ensures thermal displacement coordination between embedded parts and the main structure. In a landmark project in the Nanning ASEAN Business District, ANSYS software simulation revealed a 12MPa stress peak at the corners in the original design; after adjusting to a tapered thickness (150mm to 80mm), the stress dropped to 6.5MPa, meeting safety threshold requirements.

III. Construction Techniques and Operation & Maintenance System: Building a Full-Chain Solution

In construction, Qinglong innovatively adopts a "layered installation + elastic anchoring" process: the base keels use hot-dip galvanized steel (zinc coating thickness ≥85μm) and are connected to GRC panels through sliding connectors, allowing ±30mm horizontal displacement; panel installation strictly follows a "bottom-to-top, center-first-then-sides" sequence to avoid cumulative errors. For after-sales maintenance, a "stress monitoring–data feedback–plan adjustment" mechanism has been established, with fiber optic sensors embedded at key locations to monitor strain data in real time (sampling frequency 1Hz). In a commercial complex project in Shenzhen, this system kept the maximum deformation of the GRC curtain wall within 3.2mm over a 5-year operation period, far below the code limit.

As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has always driven industry development through technological innovation. From material formulation to intelligent construction, from static design to dynamic monitoring, it has built thermal stress solutions covering the entire life cycle of GRC curtain walls. In the future, with the R&D and application of UHPC/GRC composite panels, Qinglong will further enhance the temperature adaptability of curtain wall systems, providing more landmark buildings with the "Qinglong Solution" that combines safety and aesthetics.