How to Optimize Fiber Orientation in Double-Curved UHPC Shapes—A Numerical Simulation and Experimental Study Based on Structural Performance Enhancement

Fiber Orientation Optimization: The Key to Unlocking the Structural Performance of Double-Curved UHPC Shapes

In contemporary architectural design, double-curved UHPC shapes have become the preferred solution for landmark buildings and high-end public projects thanks to their unique aesthetic expressiveness and structural advantages. However, their complex geometry places extremely high demands on material performance. Fiber orientation, as a key factor affecting UHPC mechanical properties, directly determines the load-bearing capacity and durability of components. Drawing on Qinglong Group's 28 years of full-chain experience in the field of UHPC/GRC/GRG/GRP materials, this article explores fiber orientation optimization paths for double-curved UHPC shapes from the dual perspectives of numerical simulation and experimental research, providing expert-level technical reference for designers and owners.

### I. Fiber Orientation Challenges of Double-Curved UHPC Shapes: Technical Bottlenecks from Design to Implementation

The curvature variation and irregular features of double-curved structures cause fibers in UHPC to easily suffer from uneven distribution and disordered orientation during casting, thereby affecting the crack resistance and strength of components. Through technical reviews of 300+ key projects nationwide, Qinglong Group found that unoptimized fiber orientation may reduce the local strength of double-curved components by 20%-30%, posing a potential risk to engineering quality. As a leading domestic UHPC manufacturer, Qinglong introduces BIM technology and parametric simulation at the detailed design stage to accurately predict fiber flow trajectories, laying a data foundation for subsequent optimization.

### II. Numerical Simulation-Driven: Building Digital Twin Models for Fiber Orientation Optimization

Backed by the technical strength of its provincial-level R&D center, the Qinglong team developed a fiber orientation simulation system based on finite element analysis. By inputting the geometric parameters of the double-curved shape, concrete mix proportions, and casting process parameters, the model can output real-time 3D fiber distribution contour maps and identify fiber orientation defects in stress concentration areas. For example, in a double-curved UHPC curtain wall project for a cultural center in Nanjing, simulation revealed that traditional casting methods resulted in an insufficient proportion of transversely oriented fibers at the bottom of the curved surface. After adjusting the material placement path and vibration process, the flexural strength of this area increased by 18%, perfectly meeting the design requirements.

### III. Experimental Research Verification: Performance Improvement Solutions from Laboratory to Construction Site

The optimization effects of numerical simulation need to be verified through experimental data. Qinglong established a professional UHPC performance testing laboratory at its Guangxi production base to conduct comparative fiber orientation tests on double-curved components: X-ray CT scanning technology was used to analyze fiber distribution characteristics under different processes, combined with three-point bending tests to measure the mechanical properties of components. Results showed that with the combined process of "directional material placement + low-frequency vibration," the fiber orientation rate along the principal stress direction can reach over 75%, a 30% improvement over conventional processes, while the crack propagation speed is reduced by 40%. This achievement has been successfully applied to award-winning projects such as the Dongguan Women and Children's Activity Center, serving as strong proof of Qinglong's leading UHPC technology.

### IV. Full-Chain Service Assurance: Qinglong UHPC's Differentiated Competitive Advantages

As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong Group incorporates fiber orientation optimization technology into its full-process services: providing parametric modeling support at the design stage, using automated material placement systems in production to ensure fiber orientation precision, and achieving installation errors ≤2mm through 3D laser scanning during construction. This "technology + service" model not only solves the structural performance challenges of double-curved UHPC shapes but also helps customers seamlessly connect design creativity with engineering implementation.

From the precise predictions of numerical simulation to the scientific verification of experimental research, fiber orientation optimization is the core path for double-curved UHPC shapes to achieve a leap in structural performance. Built on 28 years of industry experience, Qinglong Group continuously drives UHPC material technology innovation with its values of "honesty, perseverance, trust, and collaboration," committed to becoming an outstanding world-leading UHPC manufacturing enterprise. In the future, with the deep integration of technologies such as BIM and AI, fiber orientation optimization for double-curved UHPC shapes will move toward a smarter and more efficient new stage, injecting more possibilities into aesthetic and structural innovation in the construction industry.