Seismic Behavior of Eccentric Steel Beam to Box Column connections
|關鍵字:||偏心梁柱接頭;實尺寸試驗;肋板;側向垂直加勁板;橫隔板;eccentric connections;full-scale test;rib;side plate;diaphragm|
Eccentric connections between welded box column and steel beam are not uncommon in the steel moment-resisting buildings. This research aims to investigate the seismic behavior of eccentric connections by full-scale test. Four eccentric connections, that included one unreinforced connection and three reinforced connections were tested under cyclic loading. The test results showed that unreinforced connection was unable to develop the required ductile behavior because of brittle fracture at the edge of groove weld. The specimen, strengthened with two vertical rib plates at the edges of the beam flange, can reduce the stress concentration at the edges of the CJP welds. Nevertheless, failure was initiated from the CJP cracks occurred at the bottom beam flange. The rest specimens were strengthened with the side plates and a single rib to attenuate high strain demand at the borders of flange groove welds. Significant improved moment-plastic rotation behavior was obtained from these two specimens. Moreover, the performance of connections depends on the integrity of the welding to join the diaphragm. It is concluded that the presence of the eccentricity in the connection would conduce the unstable behavior of the joint.
|Appears in Collections:||Thesis|