Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Cyclic loading test for shear-deficient reinforced concrete exterior beam-column joints with high-strength bars
Highlights Innovative details were proposed to improve the seismic performance of shear-deficient exterior beam-column joints. Cyclic loading tests were performed on nine exterior beam-column joints using high-strength bars. The joint shear deformation and beam flexural deformation were measued by particle image velocimetry technique.
Abstract The seismic behavior of exterior beam-column joints is significantly affected by the beam rebar yield strength and joint hoop ratio. In the present study, high-strength bars were used for beam longitudinal bars and stirrups in exterior beam-column joints with the joint hoop ratio lower than the requirement of ACI 318–14. In an attempt to distribute the damage from the joint panel toward the beam in the shear deficient exterior beam-column joints, the beam shear resistance was intentionally decreased by removing the beam cross-ties or by using the high-strength beam stirrups at a large spacing. Cyclic loading tests were performed on 9 exterior beam-column joints. The test parameters were the amount of joint hoop bars, the yield strength and diameter of the beam longitudinal bars, the yield strength and spacing of the beam stirrups, and use of beam cross-ties. The test results showed that the seismic performance was improved by increasing the beam flexural damage, preventing a shear failure, through a reduced contribution of the beam stirrups to the shear strength of the beam or weakening the beam by removing the beam cross-ties that increased vulnerability of buckling of the beam longitudinal bars. As the damage concentration was transferred from the joint panel to the weakened beam, the energy dissipation capacity and damping ratio increased by 30% and 54%, respectively. It was found that 33% decrease in the amount of joint hoop bars compared to that of prescribed in ACI 318, equal to one leg of joint stirrup, was enough to change the failure mode from the beam flexural failure to severe joint shear failure. The allowable development length of beam compression bars was discussed to prevent the cover concrete spalling at the back face of the column. Particle image velocimetry (PIV) was conducted to accurately measure the joint shear deformation and the distribution of the local flexural deformation of the beam.
Cyclic loading test for shear-deficient reinforced concrete exterior beam-column joints with high-strength bars
Highlights Innovative details were proposed to improve the seismic performance of shear-deficient exterior beam-column joints. Cyclic loading tests were performed on nine exterior beam-column joints using high-strength bars. The joint shear deformation and beam flexural deformation were measued by particle image velocimetry technique.
Abstract The seismic behavior of exterior beam-column joints is significantly affected by the beam rebar yield strength and joint hoop ratio. In the present study, high-strength bars were used for beam longitudinal bars and stirrups in exterior beam-column joints with the joint hoop ratio lower than the requirement of ACI 318–14. In an attempt to distribute the damage from the joint panel toward the beam in the shear deficient exterior beam-column joints, the beam shear resistance was intentionally decreased by removing the beam cross-ties or by using the high-strength beam stirrups at a large spacing. Cyclic loading tests were performed on 9 exterior beam-column joints. The test parameters were the amount of joint hoop bars, the yield strength and diameter of the beam longitudinal bars, the yield strength and spacing of the beam stirrups, and use of beam cross-ties. The test results showed that the seismic performance was improved by increasing the beam flexural damage, preventing a shear failure, through a reduced contribution of the beam stirrups to the shear strength of the beam or weakening the beam by removing the beam cross-ties that increased vulnerability of buckling of the beam longitudinal bars. As the damage concentration was transferred from the joint panel to the weakened beam, the energy dissipation capacity and damping ratio increased by 30% and 54%, respectively. It was found that 33% decrease in the amount of joint hoop bars compared to that of prescribed in ACI 318, equal to one leg of joint stirrup, was enough to change the failure mode from the beam flexural failure to severe joint shear failure. The allowable development length of beam compression bars was discussed to prevent the cover concrete spalling at the back face of the column. Particle image velocimetry (PIV) was conducted to accurately measure the joint shear deformation and the distribution of the local flexural deformation of the beam.
Cyclic loading test for shear-deficient reinforced concrete exterior beam-column joints with high-strength bars
Borujerdi, Ali Soleimani (Autor:in) / Mostofinejad, Davood (Autor:in) / Hwang, Hyeon-Jong (Autor:in)
Engineering Structures ; 237
25.02.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Shear behavior of exterior reinforced concrete beam-column joints
| British Library Online Contents | 2010
High-Strength Reinforcement in Exterior Beam-Column Joints under Cyclic Loading
| Online Contents | 2017