In the present paper the results of a three-dimensional finite ~lement analysis of punching fail- ure in reinforced concrete slabs are presented and discussed. The analysis 1s camed. out usmg th~ three- dimensional special purpose finite-element code MASA. To demonstrate…
In the present paper the results of a three-dimensional finite ~lement analysis of punching fail- ure in reinforced concrete slabs are presented and discussed. The analysis 1s camed. out usmg th~ three- dimensional special purpose finite-element code MASA. To demonstrate that .the .co~e 1s able to reahst1cally predict punching failure, a punching test on an interior sla~-column. connection 1:; simulated and the results are compared with the test results. Subsequently, a parametnc study is performed where the co~crete proper- ties and the reinforcement ratio are varied. To investigate the size effect, for a fo<.ed set of matenal parameters the slab geometry is scaled. The results of the study are discussed and compared with design code recommen- dations. T-CODE MASA I INTRODUCTION 2 FINITE-ELEME N A finite-element analysis based on a realistic mate- 2.1 General rial model for concrete is a helpful tool for the de- The FE-code MASA (Ozbolt 1998) is aimed to be velopment of analytical models for punching failure used for the two- and three-dimensional linear and of reinforced concrete flat slabs. It serves as a sup- non-linear analysis of structures made of quasi- port of the experimenta l studies in which several dif- brittle materials such as concrete. The program is ficulties can appear. These are summarized as fol- based on the microplane material model (Ozbolt et lows: (1) The available punching tests exhibit an al. 2001) and a smeared crack approach.