| Title |
Structural Performance of Cold-Formed HSS Bracing Members According to width-thickness ratio |
| Authors |
Han Sang-Whan ; Ryu Ho-Won ; Kim Wook-Tae ; Lee Li-Hyung |
| Keywords |
Bracing Members ; Width-thickness Ratio ; Energy Dissipation Capacity ; Balanced Strain |
| Abstract |
Braced frames have been widely used in buildings due to their large lateral stiffness and strength. This study investigated the seismic behaviors of cold-formed Hollow Structural Section(HSS) bracing members. For this purpose, experimental tests were carried out using quasi static reversed cyclic loading. For selecting the loading shape for the experimental tests, a three story special concentrically braced frame was designed according to AISC LRFD Manual(2001). Then nonlinear time history analysis was conducted using earthquake ground motions. This analytical study observed that the drifts of brace members in compression and tension were almost identical. The symmetric behavior in tension and compression can be attributed to the strong beams designed for SCBF that should resist the unbalanced axial loads induced by connected bracing members. Thus, symmetric loading shape was adopted. Particularly, this study investigated the effect of a width- thickness ratio(w/t ratio) on seismic behavior of HSS bracing members. This study shows that HSS bracing members with a small w/t ratio could not guarantee the larger amount of energy dissipation compared to those having??a larger w/t ratio. |