Non-linear analysis of slab-column connections with openings

Abstract

This paper is focused on the assessment of punching capacity of the slab-column connections without transverse reinforcement with openings located close to a column. Non-linear analysis and design equations from the relevant codes of practise are used for the prediction of the punching resistance of flat slab specimens supported by the rectangular columns with different ratio h/d of the column’s cross-section. The non-linear models were calibrated using experimental results from the laboratory tests. The main goal of the study is an investigation of the effect of the openings on the punching capacity and as well as testing accuracy of the design equations for the prediction of the punching resistance. Several methods for the reduction of the control perimeter length accounting for presence of the openings were tested in order to find the most general method for the estimation of the punching capacity. However, standard methods introduced in the relevant codes of practise provide very inconsistent results concerning of the model’s safety for different position of the openings as well as for different cross-section of the columns. Therefore modification of the methods was proposed and verified using obtained results.