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

In the contemporary process of building industrialization, ultra-high performance concrete (UHPC) is gradually becoming a breakthrough solution for floor slab structural design thanks to its outstanding mechanical properties and material characteristics. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP material field, Qinglong Group, through full-chain technical accumulation, has a profound understanding of the load-bearing capacity calculation logic and key influencing factors of UHPC panels in floor slab applications, providing a scientific basis for selection for designers and owners.

**Core Logic and Standardized Methods for Calculating UHPC Floor Slab Load-Bearing Capacity**
When UHPC panels are used as floor slabs, load-bearing capacity calculations must be built on the dual foundation of material properties and structural mechanics. Under the framework of the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (Plan No. 2024-0232T-JC), the calculation model must simultaneously consider the material constitutive relationship and the stress state of components. Compared with traditional concrete, UHPC—with a compressive strength of ≥150MPa and an excellent fiber bridging effect—requires the introduction of a fiber reinforcement coefficient in flexural capacity calculations to correct the contribution value of the tensile zone of the cross-section. During the detailed design phase, Qinglong Group uses BIM technology to build refined finite element models that accurately simulate stress distribution under different spans and load conditions, ensuring consistency between calculation results and actual engineering performance.

**The Decisive Influence of Material Properties on Load-Bearing Capacity**
The performance parameters of the UHPC material itself directly determine the upper limit of floor slab load-bearing capacity. Qinglong's production base adopts customized mix proportion design, optimizing steel fiber content (typically 1.5%-2.5% by volume) and particle size grading to ensure the product's flexural strength stably exceeds 30MPa. Meanwhile, homogeneity control of raw materials is crucial—the activity index of silica fume, the grading precision of quartz sand, and the aspect ratio of fibers all affect the interfacial transition zone performance of the material. In the laboratory of the Nanning production base, every batch of UHPC must undergo 28 days of standard curing and flexural strength testing, and only after the data meets the standard can it enter the production process, safeguarding floor slab load-bearing performance at the source.

**Collaborative Optimization Path of Structural Design Parameters**
Beyond the material itself, the geometric parameters and constructional measures of floor slabs play a significant regulatory role in load-bearing capacity. The slab thickness-to-span ratio is a fundamental control indicator. Through more than a thousand engineering projects, Qinglong's technical team has concluded that under conventional loads (2.0-5.0kN/m²), the economical span of UHPC floor slabs should be controlled within 3.5-6.0m, with slab thickness set at 1/30-1/40 of the span, achieving the optimal balance between material strength and dead weight control. In addition, innovative applications of reinforcement methods (such as combining prestressing technology with UHPC) can further enhance load-bearing capacity. In the Nanjing East Road Century Plaza renovation project that Qinglong participated in, an internally prestressed UHPC floor slab system was adopted, reducing weight by 40% compared with traditional reinforced concrete solutions while increasing load-bearing capacity by 25%.

**The Supporting Role of Construction Techniques and Later-Stage Maintenance**
The long-term performance of load-bearing capacity is inseparable from scientific construction and maintenance systems. Qinglong Group's full-chain control model of "detailed design—prefabricated production—installation and construction" ensures precision control of UHPC floor slabs from factory prefabrication to on-site installation. During the installation phase, 3D laser scanning positioning technology is adopted, with errors controlled within ±2mm to avoid stress concentration caused by installation deviation. In terms of after-sales maintenance, relying on a service network covering the whole country, a regular inspection mechanism has been established, using a combination of the rebound method and ultrasonic flaw detection to monitor material performance degradation, providing data support for load-bearing capacity assessment of existing buildings.

As a national high-tech enterprise and a participant in UHPC industry standard-setting, Qinglong Group has always taken "creating beautiful architecture" as its mission, transforming 28 years of technical accumulation into the ability to solve practical engineering problems. In the field of UHPC floor slab applications, through the deep integration of material innovation, design optimization, and refined construction, the company continuously drives building structures toward lightweight, high-strength, and long-life development, providing solid material and technical support for green buildings and intelligent construction.