Seismic behavior of wall-type spiral stirrups-confined RC column to steel beam joint: Fid-Bau Portal

Seismic behavior of wall-type spiral stirrups-confined RC column to steel beam joint

Cao, Jiahao / Hao, Jiping / Xue, Qiang / Fan, Chunlei / Sun, Xiaoling

Abstract This study proposes a new interior diaphragm joint between wall-type reinforced concrete column with high-strength spiral stirrups and steel beams, and the quasi-static test was conducted to investigate the seismic performance of the new joint under cyclic lateral force. Finite element model (FEM) simulation was carried out using the software ABAQUS, and the correctness of the FEM was verified by the results of the test. Additionally, the effect of parameters including the strength of concrete, thickness of the beam flange, interior diaphragm, joint flange, and joint web on the seismic performances of the joint was analyzed. Based on the parametric analysis and existing codes, a shear capacity formula was determined with the consideration of the shear capacity of the joint web and flange, and concrete. The comparison between the calculated and FEM results indicates that this formula could be regarded as an accurate calculation method for the shear-bearing capacity of different joint types in engineering design.

Highlights • A new type of joint connecting steel beams and wall-type RC columns with high-strength spiral stirrups was proposed. • The seismic performance of the connection was studied using quasi-static tests. • The two compressive diagonal struts mechanism was used in the shear capacity of the concrete. • The shear capacity of the joint core area was analyzed. • The simplified nonlinear model and boundary condition save time cost.