An Analysis of the Parametric Design Workflow and Key Technologies for Custom-Shaped GRC Forms

Driven by both contemporary architectural aesthetics and engineering technology, freeform shapes are becoming the core language through which landmark buildings express their unique character. GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength properties and flexible formability, has become the ideal material for realizing complex architectural forms. This article provides an in-depth analysis of the implementation path of GRC freeform shapes from two dimensions—parametric design workflow and key technologies—offering designers and owners a full-chain technical reference from concept to completion.

Underlying Logic and Workflow Framework of Parametric Design for GRC Freeform Shapes

Parametric design is the core bridge that takes GRC freeform shapes from concept to physical form. Its essence lies in establishing an associative model between geometric parameters and engineering constraints to achieve digitally driven design. Taking the hyperbolic curved exterior wall of a cultural center as an example, the Qinglong team used the Rhino+Grasshopper platform to decompose the building skin into 1,200 differentiated GRC unit panels. By controlling key parameters such as radius of curvature (as small as 280mm), panel dimensions (standard unit 1.5m×3m), and glass fiber content (6%-8%), a balance between shape accuracy and material performance was achieved. The entire process consists of four steps: first, 3D scanning is performed to obtain site data and build a BIM model; second, preliminary shapes are generated through parametric algorithms and structural load simulations are conducted; next, the panelization scheme is optimized according to production processes, reducing mold count by 30%; finally, machining coordinates and installation positioning points are output to ensure on-site assembly tolerance of ≤3mm.

Three Key Technical Breakthroughs in Freeform GRC Forming Processes

The contradiction between shape complexity and production efficiency is the core challenge in manufacturing freeform GRC components. Through 28 years of technical accumulation, Qinglong has achieved breakthroughs in three major areas: mold development, material formulation, and forming processes. For molds, aluminum alloy modular combined molds replace traditional wooden molds, raising turnover to more than 15 uses, while CNC machining ensures curved surface accuracy of ±0.5mm. For the material system, a dedicated low-alkali cement-based formula was developed with added nano silica fume and ultra-fine steel fibers, keeping GRC flexural strength stable above 22MPa to meet the load-bearing requirements of large-span freeform components. The forming process innovation adopts a combined vacuum casting + vibration pressurization process, solving common quality problems such as air bubbles and delamination, with surface flatness controlled within 3mm/2m. This technical accumulation supported the successful implementation of benchmark projects such as the translucent concrete project at Century Plaza on Nanjing East Road, where a single freeform GRC translucent unit weighing 800kg still achieved 0.1mm-level installation accuracy.

Quality Control System for GRC Freeform Shapes from a Full Life-Cycle Perspective

Quality assurance for freeform GRC components needs to run through the entire process of design, production, installation, and maintenance. In the design stage, finite element analysis simulates extreme conditions (such as Category 12 typhoon loads) to optimize anchoring joint design. In production, an RFID chip traceability system is introduced to record key data such as material mix ratio and curing time for each component. During installation, 3D laser scanning provides real-time positioning, combined with custom adjustment brackets to achieve millimeter-level calibration. After-sales maintenance establishes a 15-year periodic inspection mechanism, including surface coating inspection and structural adhesive aging assessment. This full-chain quality control system has enabled projects undertaken by Qinglong, such as the Dongguan Women and Children's Activity Center, to operate with zero safety accidents, confirming the long-term reliability of GRC materials in the field of freeform shapes.

From the digital twin of parametric design to the meticulous craftsmanship of forming processes, the realization of GRC freeform shapes is a perfect fusion of materials science and engineering technology. As a participant in setting domestic GRC industry standards, Qinglong has always taken “creating aesthetically beautiful architecture” as its mission, transforming technological innovation into design-enabling capability through 28 years of full-chain experience. In the future, with the deep integration of materials such as UHPC and GRG with parametric technology, the artistic expression of building skins will have a much broader space for imagination, and a rigorous technical system is the solid foundation upon which these creative ideas are realized.