Punching shear test - part 3

STRONA GŁÓWNA - BADANIA - BADANIE NA PRZEBICIE - CZ. 3

Study of the behavior of plate-column connections reinforced with EPSTAL steel with high ductility in the emergency stage caused by puncture. Connections reinforced according to Model Code 2010.

The requirements of the standard

The study referred to the Model Code 2010 design guidelines related to the use of reinforcement protecting the plate-column connection after puncture, referred to as punching shear reinforcement. The Code 2010 model requires that in the case of an internal connection, the reinforcement consists of at least four intersecting bars or eight rods not connected to each other, but appropriately anchored in the pole. In the case of an edge joint, it should be assumed that the number of appropriately anchored rods is six - Model Code 2010 does not directly indicate the solution for edge joints. In the case of an edge connection, the reinforcement anchoring perpendicular to the edge of the slab should be properly made.

Purpose of research

In order to experimentally verify the Model Code 2010 guidelines, laboratory tests were carried out, which included models constituting a part of the plate-and-column system. The research models were made as a monolithic element in the form of a rectangular, reinforced concrete slab with a fixed height with a column with a square cross-section at the bottom. Three research models were made in the scope of the presented research:

model of internal connection with integrating reinforcement made of straight barsadhesively anchored in the model (Model 1);
internal connection model with integrating reinforcement made of bent barsadhesively anchored in the model (Model 2);
edge connection model with integrating reinforcement made of bentbars mechanically anchored outside the model in the test bench (Model 3).

The course of research

The test program included carrying out two load phases. In the first phase, the model was loaded until it was destroyed by puncture, and then in the second phase after puncture the load was increased until the next bars of the lower reinforcement crossing the column were broken.

A detailed report on the research and the author's conclusions and recommendations will be available in Technical Bulletin No. 9 (premiere on 06/03/2018).