はりS・柱RCで構成される内部柱はり接合部の応力伝達機構

抄録

In this paper, the mechanism of the stress transfer from the steel beam to the reinforced concrete column through abeam-column joint was clarified theoretically. In this mechanism, the plinciple of prying mechanism of steel beam embedded in reinforced concrete column was applied (Fig. 1). On the basis of this mechanism, a method capable of predicting the ultimate strength of the joint was proposed (eqs. (5)-(7)). The method was taken account of the bearing strength of the concrete below the bottom flange and above the top flange of the embedded steel beam. To verify this proposed mechanism of stress transfer and method capable of predicting the ultimate strength of the joint, two interior steel beam-reinforced concrete column assemblies were tested. The predictions were shown to be in good agreement with the test results. Furthermore, this proposed method was applied to estimate the ultimate strength of steel beam-reinforced concrete column joints containing additional reinforcement; stud connectors and reinforcing bars welded to the embedded steel beam, and steel beam-composite column joints. In case of these types of joints, the ultimate strength P_<theo.> of the joint was estimated by summing the strength P_<u0> obtained by eqs. (5)-(7) with additional strength ΔP_<u0> provided by welded reinforcement or steel section of composite column (i.e., P_<theo.>P_<u0>+ΔP_<u0>). The comparison was made between predictions and test results on steel beam-reinforced concrete column joints with additional reinforcement obtained by author and steel beam-composite column joints obtained by other researchers. The predictions were shown to be in good agreement with the test results.