Evaluation Formula on Punching Shear Load-Carrying Capacity of RC Slabs under the Running-Load

Abstract

The reinforced concrete slabs of steel road bridges directly support the wheel loads of large vehicles. The maximum load-carrying capacity of the slabs is usually evaluated by a punching shear load-carrying capacity. With the objective of clarifying the punching shear load-carrying capacity of the slabs under running loads, the authors conducted tests under running loads on the three types of test specimens with different compressive strength of concrete, quantity of reinforcements, and effective depth. As a result, the authors proposed a punching shear dynamic model in the ultimate limit state and an equation for calculating the punching shear load-carrying capacity based on the maximum load-carrying capacity and the strains in reinforcements, and evaluated the agreement between the experimental values and the theoretical values calculated from the equation.