טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentYosef Halevy
SubjectModeling of Shear and Punching using Shear Friction
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Mr. Pisanty Avraham (Deceased)


Abstract

This study examines, widens and calibrates an ultimate state plasticity model that presents a computerized simulation of the element failure. This enables to estimate the shear and punching capacity considering various parameters that affect the capacity.  

Within the framework of this study the shear model was extended to enable the shear capacity estimation of beams without shear reinforcement. The punching model was based on a complete physical model while adding the membrane forces to the model, and enhancing this improvement the punching capacity equations were redeveloped. In addition, the formerly assumed pyramidal failure was replaced in the current model tracking the location of the simpler conical surface with the lowest resistance, and according to this conical surface resistance the punching capacity was determined. The punching model formulation as represented in this study, permits a good estimation of the punching capacity of slabs with or without punching reinforcement.


The prospect of a good capacity estimation derived from the herein developed models depends very much on a reliable calibration. In this study the models were calibrated using over 250 experiments of beams that failed in shear and over 300 experiments of slabs that failed in punching. Yet, experimental evidence for punching with shear reinforcement was relatively scarce. Computer programs were written to enable the model’s calibration as well as computer programs that implement the calibrated models to estimate the capacity of all the elements treated in this study.


The use of the model based on the Shear Friction theory demands focusing on the unique aspects appearing in shear and punching. Analysis of parameters that affect shear friction is shown in this study as a preface for use in calculating capacities of shear in beams and punching in slabs.