JOINT SHEAR BEHAVIOR PREDICTION IN RC BEAM-COLUMN CONNECTIONS SUBJECTED TO SEISMIC LATERAL LOADING

摘要

An extensive database of reinforced concrete (RC) beam-column connection test specimens exhibiting joint shear failure when subjected to reverse cyclic lateral loading (341 experimental subassemblies in total from all over the world) was constructed and classified by governing failure mode sequence, in-plane geometry, out-ofplane geometry, and joint eccentricity. The included subassemblies were constructed at above one-third scale, and they all used conventional types of reinforcement anchorage. Adequate joint confinement was found to be maintained when the provided amount of joint transverse reinforcement was equal to or above a certain limit. Possible influence parameters on the maximum response (in terms of both stress and strain, and thus also average stiffness) of RC joint shear behavior are first introduced. Then, RC joint shear strength and deformation models, which are applicable across diverse types of RC beam-column connections, are suggested by employing a Bayesian parameter estimation method. The suggested joint shear strength and deformation models indicate that RC joint shear (stress and strain) capacity under reverse cyclic (seismic) lateral loading is mainly dependent on concrete compressive strength, in-plane geometry, out-of-plane geometry, joint eccentricity, beam reinforcement, and joint transverse reinforcement. Finally, key parameter effects on the maximum response of RC joint shear behavior are discussed.