Abstract
The present paper studies eccentric braces (EBs) and buckling-restrained braces (BRBs) used in steel frames. The eccentrically braced frames (EBFs) and buckling-restrained braced frames (BRBFs) that have respectively employed the EBs and BRBs are considered with different types of links as shear, moment-shear and moment links depending on their link length which is an important factor in the design of the EBFs and BRBFs. The BRB consists of a steel core and its surrounding steel tube filled with concrete. The concrete confinement prevents buckling of the steel core. The analysed EBFs and BRBFs by the finite element software ABAQUS under earthquake records are taken into account. Effects of the links of the EBFs and BRBFs on the performance of the frames are discussed. The results uncover that most of the lateral displacements of the EBFs and BRBFs having the shear link are smaller than their counterparts having the moment-shear and moment links, whilst, all the base shear capacities of the former are the greatest. However, majority of the EBFs and BRBFs with the moment link dissipate less energy than their counterparts with the shear and moment-shear links, whereas, most of the link rotations of the former are smaller than the latter. In addition, the BRBFs generally demonstrate better performance than their EBF counterparts.
Highlights
Large lateral displacements can occur in steel moment-resisting frames due to extreme earthquakes
Utilising the buckling-restrained brace (BRB) in the frames can improve their lateral performance compared with the frames using the eccentric braces (EBs), because the buckling-restrained braces (BRBs) has the advantage of preventing the overall buckling of the core member under the axial compression
In the labels of the eccentrically braced frames (EBFs), the letters after the first three letters respectively represent the type of the link and the earthquake record
Summary
Large lateral displacements can occur in steel moment-resisting frames due to extreme earthquakes. The lateral displacements of frames in structures can be mitigated by the use of the eccentric brace (EB) compared with the moment-resisting frames. Utilising the buckling-restrained brace (BRB) in the frames can improve their lateral performance compared with the frames using the EB, because the BRB has the advantage of preventing the overall buckling of the core member under the axial compression. Roeder and Popov [1] described the system of EBF and its many advantages in the seismic design of structures. Bosco et al [8] proposed a design procedure for dual systems with moment resisting frames and EBFs. The seismic response of EBFs under artificial sequences was evaluated by Ruiz-García et al [9]. Tapia-Hernández and García-Carrera [10]
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