Testing Concrete in Torsion: Instability Analysis and Experiments

摘要: Torsion tests have been used to evaluate the shear response of concrete. The complete load-deformation unnotched concrete specimens subjected torsion is difficult obtain because test instabilities. In this paper torsional with a closed-loop system are performed on hollow cylinders. instability shown be result snapback in postpeak part torque-twist these specimens. failure propagation single major crack. A signal that combination torque and gauge rotation introduced demonstrated give improved control by eliminating instability. both controlled uncontrolled tests, using specially designed equipment, presented analyzed terms