How to Calculate the Load-Bearing Capacity of UHPC Panels Used as Floor Slabs

When UHPC panels are used as floor slabs, the load-bearing capacity calculation must follow the "Code for Design of Concrete Structures" (GB 50010) and the "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components". The core process follows four steps: "load value determination → section property calculation → load-bearing capacity verification → stability review". Through BIM modeling and experimental verification, Qinglong has reduced floor slab load-bearing capacity calculation errors to ≤5%. Projects such as the Shanghai Astronomy Museum and Yangshengtang Pharmaceutical all meet usage requirements.

1. Load Value Determination: The Fundamental Prerequisite for Calculation

Accurate value determination ensures calculations match actual conditions. Dead load: includes the self-weight of the UHPC panel (approximately 60kg/㎡, based on a 25mm thickness) plus additional loads from leveling layers, suspended ceilings, etc. Qinglong calculates these by superposition based on actual construction, with an error ≤3%; Live load: values are determined by usage scenario—2.0kN/㎡ for residential floor slabs, 3.5kN/㎡ for commercial floor slabs, and 5.0kN/㎡ for industrial floor slabs. Qinglong can adjust according to project requirements while considering unfavorable arrangements of live loads; Accidental loads: earthquake and impact loads are taken per the code, with seismic action considered at a fortification intensity of 7-8 degrees. Qinglong increases accidental load values by a factor of 1.2 to ensure a safety margin.

2. Section Properties and Load-Bearing Capacity Verification: The Core Calculation Step

Scientific calculation ensures load-bearing capacity meets standards. Section property calculation: calculates the section moment of inertia and section modulus of the UHPC panel, taking into account the steel fiber reinforcement effect (tensile strength taken as 8-10MPa). Qinglong uses finite element software for calculation, improving section property accuracy by 20%; Flexural capacity of normal sections: calculated using the flexural member formula, M≤α₁f_c bx(h₀ - x/2), where f_c is the axial compressive strength of UHPC (≥120MPa). Qinglong takes f_c as 0.9 times the measured value in calculations to retain a safety reserve; Shear capacity of inclined sections: verifies the shear resistance of the panel, V≤0.7f_t bh₀ + f_yv A_sv h₀/s. Qinglong UHPC panels have a shear strength ≥5MPa, requiring no additional stirrups; Stability review: for large-span UHPC floor slabs (span >3m), overall stability is reviewed to prevent buckling. Qinglong installs secondary beam supports when the span >3m, improving stability by 40%.

3. Qinglong's Calculation Verification and Project Practice

Tests and simulations provide dual verification of calculation results. Test verification: UHPC floor slab specimens of the same specification are fabricated for static load testing, with the deviation between measured and calculated load-bearing capacity ≤5%. Qinglong achieves 100% specimen testing coverage; BIM simulation: Revit combined with ETABS software is used to simulate floor slab loading, analyze stress distribution, and optimize section dimensions. For the Qinglong Shanghai Astronomy Museum UHPC floor slabs, stress concentration areas were thickened by 5mm through BIM simulation, improving load-bearing capacity by 15%; Project cases: the UHPC floor slabs of the Yangshengtang Pharmaceutical Hangzhou Industrial Park (30mm thickness, 2.5m span) have a calculated load-bearing capacity of 4.0kN/㎡ and a measured capacity of 4.2kN/㎡, meeting the usage requirements of pharmaceutical plants; the Shanghai Astronomy Museum public art UHPC load-bearing panels (40mm thickness, 3m span) were calculated with sculpture loads taken into account, meeting load-bearing capacity standards with no deformation.