SHEAR STRENGTH OF RC FRAME JOINTS WITH DIFFERENT DEPTH BEAM USING SOFTENED STRUT-AND-TIE MODEL

摘要

Ten specimens of interior joints with different depth beams were tested under reversed cyclic loading. The failure characteristics and failure process of interior joints are analyzed. Based on the experimental study,an analytical model for equivalent joint core of frame joint under the combined action of axial load and shear is established,and the shear strength of equivalent joint core of tested specimens was calculated by using softened strut and tie model (STM). Results indicated that the calculated shear strength of STM is quite nearly with that of code method,but STM has more definite mechanical model and can reasonable reveal failure mechanism of beam column joint. Thus,good agreement between experimental results and prediction results of STM is achieved. Based on softened strut and tie model,the effect of axial compression ratio on seismic behaviour of joints with different depth beams is also discussed.