How to Calculate the Load-Bearing Capacity of UHPC Panels Used as Floor Slabs: Structural Design and Qinglong Group Engineering Application Guide

When UHPC panels are used as floor slabs, load-bearing capacity calculations must adopt the "elastic theory + plastic correction" method, comprehensively considering three controlling factors: flexural capacity, shear capacity, and punching shear capacity. Based on 28 years of structural engineering experience, Qinglong Group has summarized practical calculation formulas: flexural capacity Mu = 0.85fct·b·h²/6, shear capacity Vu = 0.7ft·b·h, and punching shear capacity Pu = 0.6ft·um·h, where fct is the tensile strength (15-25MPa) and ft is the shear strength (8-12MPa). In a Loft apartment project in Shenzhen, we used 30mm thick UHPC floor slabs (compressive strength 150MPa); calculations showed that the allowable uniformly distributed load reaches 15kN/m², three times that of ordinary concrete slabs. Scientific calculation not only ensures safety but also provides the basis for optimized design.

Material performance parameters are the foundation of calculation. Qinglong UHPC has a standard tensile strength of 20MPa, an elastic modulus of 45GPa, and a peak strain of 0.3%. We determine design parameters through material property tests, with a safety factor of 2.0. In a commercial renovation project in Nanning, precise calculations reduced the floor slab thickness from 120mm for ordinary concrete to 40mm, increasing the clear spatial height by 0.8m.

Constructional measures improve load-bearing efficiency. We adopt a ribbed slab design with rib heights of 60-80mm and spacing ≤600mm, increasing load-bearing capacity by 50%. Connection joints use a shear key design to ensure integral performance. Finite element analysis verifies the calculation results; stress contour maps show uniform stress distribution with no concentration.

Long-term performance and durability considerations. The creep coefficient of UHPC floor slabs is taken as 1.8, with carbonation depth growth ≤0.1mm per year. Qinglong Group provides calculation documents and inspection reports, offering a complete basis for design. Scientific calculation makes UHPC floor slab applications both safe and economical.