Research on Fiber Orientation Optimization Strategy and Mechanical Performance Enhancement of Doubly Curved UHPC Shaping

Research on Fiber Orientation Optimization Strategy and Mechanical Performance Enhancement of Double-Curved UHPC Forms

With 28 years of materials science expertise as the pen and fiber orientation optimization as the ink, Qinglong reshapes the beauty of architectural mechanics through double-curved UHPC art.

At the intersection of contemporary architectural aesthetics and engineering technology, ultra-high performance concrete (UHPC) is becoming the preferred material for landmark building skins thanks to its outstanding mechanical performance and design freedom. In complex forms such as double-curved surfaces in particular, the scientific control of fiber orientation directly determines both structural safety and artistic expressiveness. As a national high-tech enterprise with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group has built a complete solution from material R&D to engineering implementation through full-chain technological innovation, providing professional support for designers and owners to overcome the technical bottlenecks of irregular structures.

### Mechanical Challenges of Double-Curved UHPC and Fiber Orientation Optimization Pathways

During the forming of double-curved UHPC components, material flow characteristics and fiber distribution patterns directly affect structural load-bearing capacity. Traditional casting processes tend to cause fiber agglomeration or disordered orientation at curve transitions, creating locally weak zones. Based on data accumulated from hundreds of engineering cases, Qinglong's R&D team innovatively adopted a combined solution of "3D flow field simulation + directional fiber placement process": using BIM technology to simulate concrete flow trajectories, combined with vibration gradient control technology, steel fibers achieve over 60% orientation along the stress direction in curvature variation zones, with flexural strength improved by 23% over conventional processes, successfully overcoming the forming challenge of 3.2-meter-radius double-curved components in the Nanjing East Road Century Plaza translucent concrete project.

### UHPC Performance Enhancement System Integrating Materials, Structure, and Construction

As a participating unit in formulating the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong has established a full-cycle quality control system covering material formulations, structural design, and construction processes. At the material level, a composite system of Grade 52.5 cement and silica fume is adopted, with the steel fiber aspect ratio optimized to 20:1, ensuring a fiber-matrix interfacial bond strength of 3.8MPa. During the structural deepening stage, parametric design is used to decompose the double-curved surface into spliceable single-curvature units, and through the combination of factory prefabrication and on-site assembly, the installation precision of the double-curved UHPC curtain walls in the Dongguan Women and Children's Activity Center project is controlled within ±2mm. This full-chain coordination of "design-production-construction" is precisely the embodiment of Qinglong's core competitiveness as a UHPC manufacturer.

### UHPC Double-Curved Technology Breakthroughs in Engineering Practice

In an international airport project in Saudi Arabia, facing the challenge of a 56-meter-diameter double-layer double-curved UHPC daylighting roof, Qinglong's team innovatively developed a composite process of "directional fiber spraying + prestressed tensioning": through precise robotic arm control of fiber spraying angles, combined with post-tensioning to apply circumferential prestress, component self-weight was reduced by 18% while wind load resistance was increased to 1.5kPa. This technology not only meets the requirements of extreme climate conditions in the Middle East but also shortens the construction period by 40%, confirming Qinglong's technological foresight in the field of complex UHPC forms.

From domestic landmark buildings to major overseas projects, Qinglong Group has always upheld the mission of "creating aesthetically beautiful architecture", deeply integrating materials science with engineering technology. The fiber orientation optimization of double-curved UHPC is not only an improvement in material performance, but also a perfect balance between architectural art and structural safety. As an industry-leading custom UHPC/GRC/GRG/GRP manufacturer, Qinglong will continue to drive the building skin revolution through technological innovation, providing designers with broader creative space and delivering era-defining landmarks that combine aesthetic value with engineering quality for cities.