How to Adjust the Connection Angle Between Double-Curved GRC Panels and Steel Structures: Analysis of Key Technologies and Implementation Methods

In the field of modern architectural decoration, double-curved GRC panels have become the preferred decorative material for numerous landmark buildings and high-end projects thanks to their unique curved-surface shaping capability and material properties. However, adjusting their connection angles with steel structures—a key factor affecting overall building safety and aesthetics—has long been a technical challenge in the industry. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, has accumulated systematic solutions in detailed design, manufacturing, and installation. This article analyzes the core points of connection angle adjustment between double-curved GRC panels and steel structures from three dimensions: technical principles, implementation methods, and engineering practice.

I. Technical Logic of Connecting Double-Curved GRC Panels to Steel Structures: From Material Properties to Structural Synergy

Double-curved GRC panels (glass fiber reinforced concrete), with their advantages of light weight and high strength (weighing only 1/4 of stone, with flexural strength reaching over 20MPa) and high design freedom (minimum curvature radius ≤300mm), are widely used in complex building skins such as grand theaters and commercial complexes. Adjusting their connection angles with steel structures must address three core requirements: first, ensuring stability of load transfer; second, accommodating deformation compensation for thermal expansion and contraction of materials; and third, meeting the precision requirements of architectural curved surface design. During its participation in drafting the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group validated, through extensive engineering practice, the composite technical approach of "flexible connection + rigid positioning," which both ensures structural safety and reserves reasonable tolerance space for angle adjustment.

II. Implementation Methods for Connection Angle Adjustment: Full-Process Control from Design Deepening to On-Site Installation

In the design deepening stage, the Qinglong team used BIM technology and parametric design (Rhino+Grasshopper) to build a digital twin model of the double-curved GRC panels and steel structure, simulating stress distribution at different angles to optimize connection nodes in advance. For example, in a landmark project, for the connection between double-curved panels and an inclined steel structure, the design team innovatively adopted a "three-dimensionally adjustable adapter fitting," achieving precise angle correction within ±5° through bolt sliding and angle fine-tuning mechanisms. In the manufacturing stage, relying on Qinglong's Guangxi production base with an annual capacity of 600,000 square meters, the compression molding process was used to ensure panel curvature precision within ±2mm, laying the foundation for on-site angle adjustment.

In the on-site installation stage, the Qinglong construction team used 3D laser scanning technology to verify the precision of the steel structure reference surfaces and, combined with component information traceable via RFID chips, implemented angle adjustment through a three-step process of "pre-installation positioning → fine-tuning and fixing → stress testing." Taking the Nanjing Road Century Plaza renovation project as an example, to address the connection angle deviation between translucent concrete and steel structures, technicians adopted a combination of customized angle shims and elastic rubber pads, which both resolved installation errors and avoided stress concentration caused by rigid connections. This technical solution won the Silver Award of the First UHPC Construction Engineering Innovation Award (AALBORG WHITE Cup).

III. Key Issues and Solutions in Engineering Practice: Based on Qinglong's 28 Years of Experience

In actual projects, connection angle adjustment between double-curved GRC panels and steel structures often faces three major challenges: cumulative errors in large-span curved surfaces, material deformation under extreme environments, and construction feasibility of complex nodes. Qinglong Group addressed these with three major technical innovations: first, developing "modular pre-assembly" technology, completing angle pre-adjustment between individual panels and steel supports in the factory to reduce on-site workload; second, adopting a basalt fiber reinforced GRC formula to enhance the material's deformation resistance, combined with telescopic connectors to absorb thermal stress; third, establishing a three-party coordination mechanism of "designer-engineer-installation team," sharing adjustment data in real time through BIM models to ensure on-site decision-making efficiency. For example, in the Dongguan Women and Children's Activity Center project, to address the multi-angle connection requirements between the double-curved GRC curtain wall and steel structures, the Qinglong team conducted 1:1 full-scale mock-up testing to optimize a composite connection solution of "eccentric bolts + universal joints," successfully achieving seamless splicing of complex curved surfaces. This project won the Silver Award of the First GRC Construction Engineering Innovation Award (AALBORG WHITE Cup).

As a national high-tech enterprise and an important participant in formulating GRC industry standards, Qinglong Group has always taken "creating aesthetically beautiful architecture" as its mission, transforming 28 years of full-chain experience into technical advantages. The connection angle adjustment between double-curved GRC panels and steel structures is not only a technical issue but also a systematic integration of material science, structural mechanics, and construction technology. Looking ahead, Qinglong will continue to explore the application boundaries of UHPC/GRC/GRG/GRP materials in complex buildings, providing designers and owners with expert-level solutions from concept to implementation, and driving the architectural decoration industry toward greater precision, efficiency, and creativity.