Seismic Performance of Steel Beam-Column Connections Strengthened with a Single Rib
Dr. Cheng-Chih Chen
|關鍵字:||梁柱接頭;單肋板;韌性;塑性轉角;beam-column connection;rib;ductility;plastic rotation|
The standard beam-to-column connections used in the steel moment resisting frames showed brittle failure behavior during the 1994 Northridge earthquake. One of the main causes of those connection failure was initiated by the cracking occurred due to the stress concentration at the root of the access hole. This research proposes to use a single vertical rib, which welded to top and bottom flanges of the beam along the centerline of the flange, to eliminate the stress concentration and improve the connection ductility simultaneously. The experiment was conducted to investigate the ultimate moment strength and ductility performance of connection strengthened with a single rib. Four full-scale specimens were fabricated and tested. Experimental results demonstrated that the seismic behavior of the two specimens with the shorter rib were unstable since fracture occurred at the beam flange near the end of the rib. However, the plastic rotation of the other two specimens with longer rib reached 4% and showed significant improvement of the ductility. The design procedure and details of the single rib configuration are also suggested in this investigation.
|Appears in Collections:||Thesis|