EXPERIMENTAL STUDY ON STIFFNESS AND LOADING CAPACITY OF SOLID STEEL REINFORCED CONCRETE FRAME WITH SPECIAL-SHAPED COLUMNS

According to the experimental study on two frame models composed of reinforced concrete beams and solid steel reinforced concrete (SRC) special-shaped columns under low cyclic reversed loading, the failure pattern and load-displacement hysteretic loops were obtained, and the stiffness and loading capacity were analyzed. The results show that, solid SRC frames with special-shaped columns have excellent seismic performance, and the failure mechanism is the beam-hinged mechanism. The degradation speed stiffness of the structure chances from fast to slow, which shows good regulation. The elastic story stiffness of solid SRC frame with special-shaped columns is calculated, and the results are close to the test results. The strength degradation develops with the increase of displacement, but when the displacement is less than 5#x00394;_y, the loading capacity degradation is not obvious under the same displacement. The method of plastic hinge forming at the column bottom is applicable for the calculation of story shear capacity of solid SRC frame with special-shaped columns.