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Seismic behavior of irregular shaped beam-column connections
Highlights The linear stiffness ratio of beam to column plays a key role in determine the failure mode of beam-column connection. The increase of beam stiffness will improve the load capacity of the connection. The increase of column length will decrease the load capacity of the connection. The perpendicular short RC walls restrained cracking development in the core area effectively. Adding an in-plane RC wall to the connection can effectively enhance the seismic performance, and transfer the column failure to beam failure mode. Increasing the axial compression ratio improved the stiffness of the connection, the load capacity was improved but less than 5%, the ductility reduced a lot and the strength degradation in the later stage was accelerated.
Abstract This paper reports test results and numerical analysis of special-shaped beam-column connections based on a frame-shear wall structure. Four connections of 1/5 scale ratio were tested under constant axial force and reversed lateral load on the top of column. The experiment investigated the effect of steel reinforced concrete (SRC) beam, in-plane and out of-plane reinforced concrete (RC) wall on the connections’ seismic behavior. The failure modes, hysteresis curves, ductility, strength degradation and energy-dissipating capacity of test specimens are reported. The results indicated that test joints were susceptible to suffer more brittle failure caused by formation of plastic hinge on column, which is considered unfavorable compared to conventional joint with regular shape in earthquake resisting. Adding in-plane shear walls to the connection switched column failure to beam failure mode, and significantly improved the connection’s strength, stiffness and ductility. Finite element models were detailed established and validated through experiment data. Influence of parameters including axial load ratio, concrete strength grade, section area and steel ratio of upper column, transverse hoops volumetric, RC wall of two orthogonal directions on connection’s seismic behavior were studied through modeling results.
Seismic behavior of irregular shaped beam-column connections
Highlights The linear stiffness ratio of beam to column plays a key role in determine the failure mode of beam-column connection. The increase of beam stiffness will improve the load capacity of the connection. The increase of column length will decrease the load capacity of the connection. The perpendicular short RC walls restrained cracking development in the core area effectively. Adding an in-plane RC wall to the connection can effectively enhance the seismic performance, and transfer the column failure to beam failure mode. Increasing the axial compression ratio improved the stiffness of the connection, the load capacity was improved but less than 5%, the ductility reduced a lot and the strength degradation in the later stage was accelerated.
Abstract This paper reports test results and numerical analysis of special-shaped beam-column connections based on a frame-shear wall structure. Four connections of 1/5 scale ratio were tested under constant axial force and reversed lateral load on the top of column. The experiment investigated the effect of steel reinforced concrete (SRC) beam, in-plane and out of-plane reinforced concrete (RC) wall on the connections’ seismic behavior. The failure modes, hysteresis curves, ductility, strength degradation and energy-dissipating capacity of test specimens are reported. The results indicated that test joints were susceptible to suffer more brittle failure caused by formation of plastic hinge on column, which is considered unfavorable compared to conventional joint with regular shape in earthquake resisting. Adding in-plane shear walls to the connection switched column failure to beam failure mode, and significantly improved the connection’s strength, stiffness and ductility. Finite element models were detailed established and validated through experiment data. Influence of parameters including axial load ratio, concrete strength grade, section area and steel ratio of upper column, transverse hoops volumetric, RC wall of two orthogonal directions on connection’s seismic behavior were studied through modeling results.
Seismic behavior of irregular shaped beam-column connections
Liang, Lili (author) / Bai, Guoliang (author) / Ma, Jinfeng (author) / Jiang, Qiren (author)
Engineering Structures ; 297
2023-09-21
Article (Journal)
Electronic Resource
English
Seismic Response of Beam-Column Connections
| British Library Online Contents | 1994
Numerical evaluation on shear behavior of irregular steel beam-to-CFST column connections
| British Library Online Contents | 2018