Calculation Method for Load-Bearing Capacity of UHPC Floor Slabs: Qinglong Engineering Design Guide

When UHPC panels are used as floor slabs, load-bearing capacity calculation is the core step in ensuring structural safety, requiring scientific derivation that combines material performance, panel parameters, and application scenarios. Qinglong Group, an enterprise that participated in developing the UHPC industry standard, draws on 28 years of engineering design experience to provide a professional load-bearing capacity calculation guide.

I. Core Basis for Load-Bearing Capacity Calculation and Load Types Calculations must follow the "Code for Design of Concrete Structures" and the "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)". The core basis includes material parameters of the UHPC panel such as compressive strength, flexural strength, and elastic modulus, as well as the service loads of the floor slab (dead load + live load). Load types to be considered include: panel self-weight (20-50mm thick UHPC panels weigh approximately 50-125kg/㎡), floor finishing loads, and live loads from people and equipment; industrial buildings must also consider equipment vibration loads. In a floor slab project for an industrial plant, Qinglong ensured that the load-bearing capacity met the requirements for heavy equipment operation through precise load analysis.

II. Core Calculation Parameters and Formula Application The core parameters for load-bearing capacity calculation include: UHPC panel thickness (h), support conditions (simply supported/continuous support), effective span (L), and material strength (fcu,k compressive strength, fctm flexural strength). For one-way slabs, the flexural load-bearing capacity formula is M≤α₁f_c bx(h₀-x/2), where α₁ is the equivalent rectangular stress block coefficient for the concrete in the compression zone, b is the panel width, x is the depth of the compression zone, and h₀ is the effective height. Qinglong typically applies a safety factor of 1.3 to ensure safety redundancy under extreme conditions. For example, a 30mm thick UHPC panel (fcu,k=150MPa) with a simply supported span of 1.5m can withstand a live load of ≥3.0kN/㎡, meeting the requirements for ordinary commercial and residential floor slabs.

III. Qinglong's Calculation Optimization and Engineering Verification Qinglong adopts a triple safeguard system of "theoretical calculation + numerical simulation + experimental verification". After theoretical calculation, BIM + finite element analysis software is used to simulate the stress distribution of the floor slab under different loads and optimize panel thickness and support layout; before mass production, sample panels are fabricated for load-bearing capacity tests, and the measured values must be ≥1.1 times the calculated values. In a floor slab project for a biopharmaceutical industrial park, Qinglong used this system to increase the effective span of 40mm thick UHPC panels to 2.0m while controlling self-weight, achieving a 40% weight reduction compared with traditional concrete floor slabs. In addition, based on openings, irregular shapes, and other conditions of the floor slab, Qinglong carries out local load-bearing capacity reinforcement design to ensure overall safety.

Load-bearing capacity calculation for UHPC panel floor slabs must rely on code-based references, precise parameters, and scientific methods, avoiding experience-based design. With its technological R&D and engineering experience, Qinglong Group provides integrated services from calculation and design to production and installation, ensuring that the load-bearing capacity of floor slabs meets safety requirements. Choosing a supplier with design capability and experimental verification capability is the core guarantee for the safe application of UHPC panel floor slabs.