Analysis of Load-Bearing Capacity Calculation Methods and Key Influencing Factors for UHPC Panels Used as Floor Slabs

In the field of modern architecture, material innovation has always been the core driving force behind industry development. As a new type of building material with ultra-high strength, excellent durability, and outstanding toughness, UHPC (Ultra-High Performance Concrete) is emerging in floor slab structures with its unique advantages. However, the complexity of its load-bearing capacity calculation and the control of key influencing factors have always been the focus of attention for designers and engineers. Qinglong Group, an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP material field, will draw on its full-chain technical experience to provide an in-depth analysis of the load-bearing capacity calculation methods and key influencing factors when UHPC panels are used as floor slabs, helping projects achieve dual assurance of safety and efficiency.

### Core Methods and Theoretical Basis for UHPC Floor Slab Load-Bearing Capacity Calculation

The load-bearing capacity calculation of UHPC floor slabs must be established on the dual basis of material properties and structural mechanics. Compared with traditional concrete, UHPC exhibits a more complex stress mode thanks to the bridging effect of steel fibers and its ultra-high compressive strength (typically exceeding 150MPa). In practical engineering, commonly used calculation methods include: the "simplified calculation method" based on limit state design, which quickly evaluates load-bearing capacity by combining the equivalent flexural strength of UHPC with sectional geometric parameters; and the "refined finite element analysis method," which takes into account fiber content and interfacial transition zone effects and is suitable for irregular or large-span floor slab structures. During its participation in drafting the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)," Qinglong further verified the applicability of these methods, emphasizing that precise calculation requires combining measured material strength with structural verification software (such as ABAQUS and MIDAS).

### Analysis of Key Factors Affecting UHPC Floor Slab Load-Bearing Capacity

1. **Material Mix Proportions and Fiber Characteristics**: The mechanical properties of UHPC highly depend on the optimized proportions of components such as the cement matrix, silica fume, and quartz sand, while the length, diameter, and volume fraction of steel fibers (typically 2%-5%) directly affect its tensile strength and toughness. Through large-scale practice with an annual production capacity of 600,000 square meters, Qinglong's production base found that using micro steel fibers with a diameter of 0.2mm and a length of 13mm can make UHPC's flexural toughness more than 10 times that of ordinary concrete, significantly improving the post-cracking load-bearing capacity of floor slabs.

2. **Section Design and Reinforcement Methods**: Slab thickness, reinforcement ratio, and rebar arrangement play a decisive role in load-bearing capacity. For example, in large-span floor slabs, a combined design of bidirectional reinforcement with a UHPC composite layer can effectively reduce dead weight and improve stiffness. In the Nanjing Road Century Plaza renovation project, Qinglong optimized the sectional parameters of UHPC translucent concrete floor slabs through BIM technology, successfully achieving a breakthrough of reducing structural dead weight by 30% for an 8-meter span.

3. **Construction Technology and Quality Control**: The compactness of pouring and vibration, curing temperature (90°C steam curing recommended), and forming precision directly affect the strength development of UHPC. With its Grade II professional contracting qualification for building curtain wall engineering, Qinglong has established a full-process quality control system from detailed design to construction and installation, ensuring that the coefficient of variation of compressive strength for every UHPC floor slab is controlled within 5%.

4. **Load Types and Service Environment**: Long-term static loads, dynamic loads, and corrosive environments (such as humidity and high temperature) affect the durability of UHPC. In its overseas project in Malaysia, Qinglong extended the service life of UHPC floor slabs in a marine climate to more than 50 years by adding nano-scale anti-corrosion additives, verifying the material's reliability in complex environments.

### Qinglong's Full-Chain UHPC Services: A One-Stop Solution from Calculation to Implementation

As a national high-tech enterprise and a participant in UHPC standard formulation, Qinglong not only provides accurate load-bearing capacity calculation support but also transforms theoretical data into practical engineering benefits through full-chain services including detailed design, modular production, and intelligent installation. Whether for large-span floor slabs in commercial complexes or irregular load-bearing structures in landmark buildings, Qinglong leverages its 28 years of technical expertise and annual production capacity of 600,000 ㎡ to provide designers and owners with expert-level services ranging from material selection to after-sales maintenance. Looking ahead, Qinglong will continue its mission of "Creating Beautiful Architecture," promoting the innovative application of new materials such as UHPC in the construction field and becoming a leading global UHPC manufacturer.