Key Technologies and Implementation Methods for Structural Stability of Large-Span GRC Shapes

In the field of contemporary architectural design, large-span GRC shapes, with their unique artistic expressiveness and structural lightness, have become the "crowning touch" of landmark buildings and high-end public spaces. However, their complex curved forms and ultra-large span characteristics place extremely high demands on material performance, structural design, and construction techniques. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has been deeply involved in tackling technical challenges in numerous large-span GRC projects in China. This article analyzes the core technologies and implementation paths for the structural stability of large-span GRC shapes from three dimensions: material selection, structural optimization, and construction control.

I. Material Performance: The "Cornerstone" of Large-Span GRC Structural Stability

The stability of large-span GRC shapes depends first on the mechanical properties of the material itself. Traditional GRC materials, through the composite of glass fibers and cement matrix, already possess lightweight, high-strength characteristics, but their crack resistance and durability in large-span scenarios still require targeted optimization. Through 28 years of technological accumulation, Qinglong Group has developed a high elastic modulus GRC formulation that raises flexural strength to over 20MPa. Meanwhile, by incorporating nano-level silica fume and fiber dispersion technology, material homogeneity has been improved by 30%, effectively reducing the risk of cracking caused by stress concentration.

In material selection, differentiated configurations should be made according to span length and load conditions. For example, cantilevered GRC components with spans exceeding 15 meters can adopt a "GRC+UHPC" composite structure: the surface GRC ensures fine shaping detail, while the internal UHPC skeleton provides rigid support. This combination retains GRC's design freedom while achieving a 40% reduction in structural weight through UHPC's ultra-high compressive strength (≥150MPa). In the Nanjing East Road Century Plaza renovation project, Qinglong successfully achieved the stable installation of a 22-meter-span light-transmitting GRC canopy using this technology, winning the "First UHPC Construction Engineering Innovation Award Silver Award."

II. Structural Optimization: Transforming from "Formal Aesthetics" to "Mechanical Balance"

The key to the structural stability of large-span GRC shapes lies in transforming artistic curved forms into controllable mechanical models. Relying on its provincial-level engineering technology center, Qinglong Group has established a trinity structural optimization system of "parametric design - finite element analysis - BIM simulation":

In the parametric design stage, the Rhino+Grasshopper platform is used to digitally decompose complex shapes such as hyperbolic surfaces and hollow-out patterns, discretizing continuous curved surfaces into quantifiable unit modules to ensure that the curvature radius error of each component is ≤300mm. For the 18-meter-span GRC curtain wall of the Dongguan Women and Children's Activity Center project, this technology achieved the precise segmentation of 1,200 special-shaped components, winning the "AALBORG WHITE Cup GRC Engineering Innovation Award Silver Award."

Finite element analysis focuses on stress distribution under load conditions, with emphasis on simulating the effects of wind loads, temperature deformation, and seismic action on the structure. Qinglong's independently developed GRC structural calculation software can output key data such as component deflection and anchoring point tension in real time. For example, in the design of a 30-meter-span GRC suspended ceiling for a convention and exhibition center, by optimizing rib beam spacing and anchoring methods, the maximum deflection was controlled within L/400 (code limit L/250), far exceeding industry standards.

III. Construction Control: The "Last Mile" of Whole-Process Precision Management

No matter how refined the design is, precision deviations during construction can still lead to structural instability. Qinglong Group ensures the installation precision of large-span GRC shapes through whole-process control of "factory prefabrication - on-site assembly - intelligent monitoring":

In the factory prefabrication stage, CNC mold machining technology keeps component dimensional errors within ≤2mm, and embedded RFID chips enable quality traceability. During on-site installation, 3D laser scanning positioning technology keeps hoisting errors within 5mm, while modular assembly techniques reduce working time at height. In a 25-meter-span GRC daylighting roof project for an airport terminal, Qinglong's team achieved a single-day installation area of 800㎡ using this technique, doubling efficiency compared with traditional methods.

In addition, for the long-term stability of large-span structures, Qinglong has established an after-sales system of "stress monitoring + regular maintenance." By installing fiber optic sensors at key nodes to monitor temperature stress and deformation data in real time, and formulating preventive maintenance plans based on 28 years of maintenance experience, it ensures no structural performance degradation within 10 years after project delivery.

As a member of the International GRC Association and a contributing enterprise to the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)," Qinglong Group has always upheld the mission of "creating aesthetic architecture," deeply integrating material innovation with structural technology. From domestic landmark projects to overseas projects in Southeast Asia, Qinglong has provided designers and owners with full-chain solutions from concept to implementation through the stable realization of large-span GRC shapes, confirming its corporate philosophy of "professional innovation and environmental protection." In the future, with the further development of UHPC/GRC composite technology, large-span shapes will display their unique charm across a broader range of architectural fields.