Analysis of Reinforcement Design Principles and Key Technical Points for UHPC Load-Bearing Members

In the field of contemporary construction engineering, ultra-high performance concrete (UHPC) is becoming the ideal choice for long-span, high-load load-bearing components thanks to its outstanding mechanical properties and durability. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has accumulated extensive full-chain experience in the reinforcement design of load-bearing components. This article systematically analyzes the reinforcement design principles and key technical points of UHPC load-bearing components, providing the industry with solutions that combine theoretical depth with practical value.

### Underlying Logic and Principles of Reinforcement Design for UHPC Load-Bearing Components

The ultra-high strength of UHPC (compressive strength up to 150-200MPa) and its toughness dictate that its reinforcement design must break away from the conventional thinking framework of traditional concrete. Drawing on 58 accumulated patents, Qinglong's technical team has proposed the design principles of "determining reinforcement by material, controlling rebar by force": on the basis of fully utilizing the self-stress of the UHPC matrix, structural ductility is optimized through the synergy of steel rebar and fibers. Practice shows that when the steel fiber volume content in UHPC reaches 2%, the cracking load of components can be increased by more than 40%, providing a scientific basis for reducing reinforcement. Meanwhile, drawing on Qinglong's practical experience in projects such as the Nanjing East Road Century Plaza renovation, reinforcement design must also satisfy the requirements of the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (Plan No. 2024-0232T-JC) to ensure structural safety redundancy.

### Key Technical Points: From Material Synergy to Joint Optimization

In the reinforcement scheme design, Qinglong innovatively adopts the "dual-blending system" technology: shaped steel fibers and ultra-fine quartz sand are jointly incorporated, combined with the oriented arrangement of basalt fiber bars to form a three-dimensional reinforcement network. This technology was successfully applied in the Dongguan Women and Children's Activity Center project, raising the flexural strength of UHPC load-bearing components beyond 35MPa—far exceeding traditional concrete components. For longitudinal reinforcement, HRB500E grade rebar is recommended, whose bond strength with UHPC is 60% higher than that with ordinary concrete, effectively preventing interfacial debonding failure. In addition, parametric modeling through BIM technology precisely simulates stress distribution under different load conditions to achieve an optimal reinforcement quantity—in a municipal bridge project, this technology reduced rebar usage by 18% while extending the fatigue life of components to more than 2 million cycles.

### Core Challenges and Solutions in Engineering Practice

Facing the reinforcement challenges of long-span UHPC load-bearing components, Qinglong has developed the composite technology of "graded reinforcement + prestressed UHPC" by leveraging the R&D capabilities of its provincial-level engineering technology center. In an exhibition center project in Shenzhen, by densely arranging 16mm-diameter deformed rebar in the tension zone of the components combined with a pre-compressive stress of 120MPa, the deflection of 24-meter-span components was successfully controlled within L/500. For complex joint areas, 3D scanning technology is used for 1:1 full-scale setting-out to ensure that the rebar anchorage length meets the code requirement of 35d (where d is the rebar diameter), while epoxy resin-coated rebar solves the problem of corrosion protection in marine environments—this solution has been validated in an island resort hotel project in Malaysia, extending component durability to more than 100 years.

### Industry Trends and Qinglong's Technology Empowerment

With the implementation of standards such as the "Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC)" (JGJ/T423-2018), the reinforcement design of UHPC load-bearing components is developing toward digitalization and refinement. As a national Specialized, Refined, Distinctive and Innovative enterprise, Qinglong will continue to integrate 28 years of in-depth design experience to provide designers and owners with full-chain services from material selection to construction and installation. Whether it is the large cantilevered canopies of commercial complexes or the load-bearing box girders of municipal bridges, Qinglong has always upheld the mission of "creating aesthetically beautiful architecture", driving the high-quality application of UHPC in the field of load-bearing structures through technological innovation, and helping realize the vision of "becoming a world-class leading enterprise in UHPC/GRC/GRG/GRP manufacturing".