Title: Uncertainty Modelling and Analysis of Punching Shear Resistance of Flat Slabs

Author(s): Ming-Yue Jiang, Qing-Xuan Shi, and Wang-Hu Zhao

Publication: Structural Journal

Volume: 119

Issue: 2

Appears on pages(s): 155-163

Keywords: design code; model uncertainty; punching shear strength model; reinforced concrete slab-column connections; statistical characteristics

DOI: 10.14359/51734376

Date: 3/1/2022

Abstract:
An approach is provided to modify model uncertainty related to punching shear resistance of flat slabs. Model uncertainty of six shear strength models in different design codes are investigated systematically. Based on 452 punching tests of concentrically loaded slabs, the computational accuracy of six punching shear strength models is compared. Characteristic values of model uncertainty with different specific assurance rates are determined based on the probabilistic characteristics of computational model uncertainties. The comparison shows that the accuracy of the draft of the next generation of the Eurocode 2 model is superior to the Chinese, American, and Canadian code models, which usually underestimate the punching shear resistance of flat slabs. Furthermore, the model uncertainty of the Chinese, American, and Canadian code models follow a normal distribution, whereas the model uncertainty of the other three models obey lognormal distribution.