How to Optimize Fiber Orientation in Double-Curved UHPC Forms: Analysis of Mechanical Enhancement Solutions

The core of fiber orientation optimization for double-curved UHPC shapes is “distribution along force flow paths + adaptation to surface curvature + uniform dispersion”. Through three key technologies—parametric simulation, mold flow guidance, and layered material placement—the fibers are aligned with the stress direction of the double-curved surface, increasing flexural strength by 20%-30%. Projects such as Qinglong's Guangxi New Media Center and Hainan Poly Peninsula No. 1 achieved a fiber distribution uniformity of 98%.

I. Core Principles of Fiber Orientation Optimization

Three principles guide the optimization direction. Distribution along force flow paths: fiber orientation aligns with the principal stress direction of the double-curved surface to enhance load-bearing capacity; Qinglong uses finite element analysis to identify force flow paths, achieving a fiber orientation match rate of 95%. Adaptation to surface curvature: fiber distribution density is adjusted across different regions of the double-curved surface, with density increased by 10% in areas of greater curvature; after curvature adaptation, Qinglong achieved a 25% improvement in local strength. Uniform dispersion: fiber agglomeration is avoided to ensure even three-dimensional distribution; Qinglong's fiber agglomeration rate is ≤2%, with no strength weak points.

II. Key Technologies for Fiber Orientation Optimization

Three technologies enable precise optimization. Parametric simulation: ANSYS finite element software is used to simulate the stress on the double-curved surface, predict force flow paths, and guide fiber orientation design; Qinglong's simulation error is ≤5%. Mold flow-guide design: flow guide channels are set inside the mold to direct the flow of UHPC slurry and drive the fibers to distribute along the curved surface; Qinglong's flow guide channel spacing is ≤200mm, improving fiber orientation accuracy by 40%. Layered material placement + directional vibration: material is placed in layers according to the curvature of the double-curved surface, combined with directional vibration (with the vibration direction along the surface tangent); Qinglong's vibration frequency is 200-300Hz, ensuring fibers are distributed along the designed direction. Fiber selection: steel fibers 12-18mm in length are selected to enhance bonding with the slurry; Qinglong's steel fiber tensile strength is ≥2800MPa.

III. Qinglong Project Practice and Technical Advantages

Real-world cases verify the optimization results. Guangxi New Media Center double-curved UHPC exterior walls: through flow-guide molds + directional vibration, fibers are distributed along the double-curved force flow paths, achieving a flexural strength of 18MPa with no cracking after 6 years of use. Hainan Poly Peninsula No. 1 double-curved panels: layered material placement optimized the fiber orientation, achieving a wind load resistance of 0.8kPa with no deformation during typhoons. Technical advantages: holds 5 patents related to fiber orientation optimization and participated in formulating the “Technical Specification for Double-Curved Surface UHPC”. Testing assurance: X-ray testing of fiber distribution is conducted before delivery, with Qinglong's testing coverage rate at 100%. Commitment assurance: optimized double-curved UHPC shapes have a flexural strength of ≥15MPa, with a 10-year warranty and free replacement if strength degradation exceeds the standard.