How to Ensure Structural Stability of Large-Span GRC Shapes? Cantilever Design and Qinglong Group's Mechanics Solutions

Structural stability for large-span GRC forms requires a systematic solution through "form optimization, material enhancement, and support systems", with the core focus on controlling deflection (≤1/250 of span) and avoiding buckling. In projects such as the 30m wave-shaped roof at Hainan International Convention and Exhibition Center and the 18m cantilevered eaves at Wuhan Hanxiu Theater, Qinglong Group used finite element software for wind vibration analysis and optimized the forms to reduce wind pressure coefficients; steel fibers were added to the panels (3% by volume) to raise tensile strength to 8-10MPa; and a steel truss support system was installed at the back (deflection controlled at ≤L/400). In the Hainan project, we reduced roof wind pressure by 20% through form finding, and combined with prestressing technology, the 30m-span GRC roof has served safely in a typhoon region for 10 years without deformation.

Form Finding and Load Analysis

Computer simulation is used to find the optimal load-bearing form, with hyperbolic surface shapes adopted to improve out-of-plane stiffness. In the design of grandstand panels for a stadium in Shenzhen, Qinglong Group optimized panel thickness from 120mm to 80mm through form-effect analysis, achieving a 30% weight reduction. Scientific form is the foundation of stability.

Material Enhancement and Composite Design

Large-span panels adopt a UHPC-GRC composite structure, raising flexural strength to 25MPa. We have developed FRP bar reinforcement technology, embedding carbon fiber bars within the panels with tensile strength ≥2000MPa. At cantilevered sections, prestressed cables are added to offset part of the bending moment.

Support Systems and Connection Technology

Multiple elastic supports are installed to allow thermal deformation. Connection points use hinged designs to release bending moments. Qinglong Group verified wind vibration performance through wind tunnel tests to ensure long-term stability. The realization of large-span GRC has expanded design boundaries.