Do Connection Methods Differ for GRC Panels with Different Curvatures? Connection Design Essentials and Practical Analysis

In modern architectural design, GRC panels (glass fibre reinforced concrete) have become an important material for shaping the curved aesthetics of buildings, thanks to their light weight, high strength and flexible styling. However, when facing the connection of GRC panels with different curvatures, many designers and contractors often fall into technical confusion: Is the connection technique for straight and arc-shaped panels universal? How can the assembly precision of double-curved components be guaranteed? As an industry-leading enterprise with 28 years of experience in deepened design and construction of UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyse the key points of connection design for GRC panels with different curvatures from three dimensions: material properties, structural mechanics and engineering practice.

### I. The Core Impact of Curvature Differences on GRC Panel Connections

The radius of curvature of GRC panels directly determines the stress state of connection joints and the difficulty of construction. Straight or large-curvature (radius > 5000mm) panels can be connected using conventional flat splicing techniques, but when the radius of curvature is less than 1500mm, the panels will generate continuous internal stress due to bending, and traditional rigid connections can easily lead to cracking. Take a double-curved curtain wall project of a grand theatre that Qinglong participated in as an example: its minimum radius of curvature reached 300mm, and BIM simulation found that adopting elastic connection joints could improve stress dispersion efficiency by 40%. For more industry information: +WeChat qlfsbl123

### II. Connection Solutions for Three Major Curvature Types of GRC Panels

**1. Straight and Small-Curvature GRC Panels (Radius > 3000mm)**
Such panels are suited to a “rigid base + flexible filling” connection system. In the Dongguan Women and Children's Activity Centre project, Qinglong innovatively used a galvanised steel frame as the main support, reserved 5-8mm expansion joints between panels, and filled them with a composite structure of elastic sealant and PE rods, which both ensured connection strength and released thermal deformation stress. This technique has been incorporated into the Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC) (JGJ/T423-2018).

**2. Medium-Curvature GRC Panels (500mm < Radius < 3000mm)**
For curved curtain walls or special-shaped suspended ceilings, Qinglong developed “three-dimensionally adjustable connection components”. By setting curved sliding slots and rotatable connectors on the steel keels, panels can be fine-tuned by ±5° in the X, Y and Z directions. After a commercial complex project in Nanjing adopted this technology, on-site installation efficiency rose by 30% and splicing errors were controlled within 2mm, far exceeding industry standards.

**3. Double-Curved and Ultra-Small-Curvature GRC Panels (Radius ≤ 500mm)**
Extreme-curvature panels require a modular strategy of “segmented prefabrication + on-site assembly”. In a landmark project in Saudi Arabia, Qinglong broke the double-curved panels down into 6-8 unit modules, embedded RFID chips during factory prefabrication to enable quality traceability, and positioned them on site through 3D laser scanning. Together with specially made ball-hinge universal joints, the continuous splicing of double-curved panels with a radius of 280mm was successfully completed. This technique shortened the construction period for complex shapes by 40% while ensuring structural safety. For more industry information: +WeChat qlfsbl123

### III. Material Coordination and Quality Control in Connection Design

The connection quality of GRC panels with different curvatures largely depends on the coordination of material selection. Qinglong recommends prioritising connection materials with an elastic modulus close to that of GRC in joint design, such as basalt fibre composite profiles or modified epoxy resin adhesives, to avoid stress concentration caused by differences in material rigidity. Meanwhile, all connection components must pass the 1000-hour salt spray test and the cold-hot cycling test from -40°C to 70°C, which is also the core quality standard for Qinglong as a national Specialised, Refined, Distinctive and Innovative enterprise.

From straight lines to double curves, the connection design of GRC panels has always been a comprehensive test of material properties, structural mechanics and construction techniques. With 28 years of full-chain experience, Qinglong Group has developed complete solutions covering deepened design, material R&D and construction control, and has successively provided technical support for 500+ landmark projects at home and abroad. In the future, with the development of UHPC/GRC composite panels, connection technology will achieve further breakthroughs towards intelligent and modular directions, unlocking more possibilities for architectural aesthetics.