Beräkning av skjuvbrott i pelarunderstödda plattor : En studie av kontrollen utanför påverkade zonen vid beräkning av genomstansning

Sammanfattning: The calculation process in Eurocode 2 that is showing how calculation of punching is to be done is long and some parts are not well explained. At the end of the calculation of punching, it is said that a check of the shear capacity without any reinforcement should be done outside the affected zone but the intent of the check is not justified. The purpose of the study was to find out why the check must be done and then examine whether it is possible to limit the use of the control. The results have been produced by doing literature studies on the field and calculations to understand how the control is affected. The program Excel have been used to compile and compare all the results in the calculation part. To gain a wider understanding of the area two other international standards have been compared with Eurocode 2. The standards used are American Concrete Institute 318 and Brittish Standard 8110. The maximum allowed distance of shear reinforcement without having to extend the area is 2d because the length of the base control section from the column surface in each direction has that distance. By testing how all the conditions affect the distance, is it possible to see which values are required to make the distance exceed 2d. After calculations have been made on several different prerequisites, it can be noted that on many occasions the distance is below 2d. Since so many conditions influenced the outcome, it was difficult to judge reasonable values on all of them which was making it more difficult to evaluate how often the control was needed. An uncomplicated way to limit the use of the control was by finding a prerequisite that is dominant, but it did not work in these cases so instead it was chosen to compare the shear capacitance without shear reinforcement with the transverse force loaded over the control perimeter.