Analysis of Causes and Solutions for Thermal Stress Problems in Large-Area GRC Curtain Walls

Solving the Thermal Stress Challenge, Safeguarding GRC Curtain Wall Safety — Qinglong's Systematic Solution Backed by 28 Years of Technical Expertise

Driven by the dual pursuit of modern architectural aesthetics and structural safety, GRC (glass fiber reinforced concrete) curtain walls, with their advantages of light weight, high strength, and flexible shaping, have become the preferred decorative material for high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, stress problems caused by temperature changes have long been a pain point for the industry — at best causing component cracking that compromises appearance, and at worst threatening the structural safety of curtain walls. As a national high-tech enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than a thousand engineering projects to thoroughly analyze the formation mechanisms of thermal stress in large-area GRC curtain walls, and has built a full-process solution spanning material R&D through construction and maintenance.

Analysis of the Three Core Causes of Thermal Stress in GRC Curtain Walls

The essence of thermal stress is the combined result of materials' thermal expansion and contraction characteristics and the building's restraint conditions. In large-area GRC curtain wall systems, its causes concentrate mainly in three dimensions: first, differences in the physical properties of the materials themselves — GRC panels and metal support frames have significantly different coefficients of linear expansion (GRC approximately 10×10⁻⁶/°C, aluminum alloy approximately 23×10⁻⁶/°C), so interfacial shear stress easily arises when ambient temperatures fluctuate; second, complex temperature field distribution — the temperature difference between sun-facing and shaded facades, and between day and night, can exceed 20°C, causing non-uniform deformation of curtain wall panels; and finally, excessive structural restraint — traditional rigid connection designs restrict the free expansion and contraction of GRC components, converting thermal deformation into accumulated internal stress. A landmark project once developed through cracks across 1,200 m² of GRC curtain wall because it failed to account for the extreme temperature range from -15°C in winter to 60°C in summer — a typical case of thermal stress spiraling out of control.

Qinglong's Full-Chain Solution: Systematic Prevention and Control from Materials to Operation and Maintenance

To tackle the thermal stress challenge, Qinglong Group has innovatively proposed a four-dimensional solution of "material optimization - structural design - construction techniques - intelligent monitoring." At the material R&D level, incorporating basalt fiber and modified polymers reduces the elastic modulus of GRC panels by 15% while raising their ultimate elongation to 3.5%, giving the material a stronger deformation-buffering capacity. In structural design, the "flexible connection + zoned release" technology is adopted, with custom adjustable bearings developed to allow each GRC panel ±30mm displacement compensation in the X/Y/Z directions — a technology certified under the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018). During construction, BIM + 3D scanning technology is introduced to keep installation errors within ±2mm, and stress sensors are installed at key nodes to monitor thermal deformation data in real time. In after-sales maintenance, supported by a nationwide service network, a quarterly dedicated thermal stress inspection mechanism has been established, forming closed-loop management of "design - production - construction - maintenance."

Engineering Proof: A Safe Track Record Built on 28 Years of Technical Expertise

As a vice-chairman unit of the China GRC Association, Qinglong Group has successfully applied its thermal stress control technology in benchmark projects such as the Century Plaza renovation on Nanjing East Road and the Dongguan Women and Children's Activity Center. Among these, a 28,000 m² GRC curtain wall project for a cultural and arts center adopted Qinglong's patented "gradient elastic modulus composite construction," and after temperature cycle testing from -18°C to 58°C, the curtain wall's surface flatness error remained within 3mm/m — a 60% improvement in stability over traditional methods. This achievement confirms Qinglong's full-chain technical advantages in GRC detailed design, manufacturing, and installation, and demonstrates the innovation strength of a national "specialized, refined, distinctive, and innovative" enterprise.

Thermal stress control is the lifeline of GRC curtain wall safety and the touchstone of a material supplier's technical strength. With the mission of "creating beautiful architecture," Qinglong Group will continue to deepen its UHPC/GRC/GRG/GRP material technology R&D. Drawing on 28 years of accumulated full-chain service experience, it provides designers and owners with expert-level solutions from design optimization to long-term maintenance, ensuring that every GRC curtain wall combines artistic beauty with structural stability and becomes a safe scenic line on the city skyline.