Seismic Behavior of Strengthened Steel Beam to Box Column Connections
|關鍵字:||梁柱接頭;實尺寸實驗;單肋板;翅板;塑性鉸;韌性;box-column connection;full-scale test;single rib;wing plate;plastic hinge|
In recent years the steel structures have been widely used in the design and construction of high buildings in Taiwan. Box columns and H beams are commonly used in Taiwan. The H beam to H column connections is studied extensively. However, very limited research has carried out on H beam to Box column connections. This study is aimed at studying the seismic behavior of strengthened Box column connections by Non-linear finite element analysis and full-scale test. The abrupt changes in geometry cause stress concentration at the weld access hole and both tips of the beam flanges. In this study the connections are strengthened by using single rib and wing plate. Full-scale tests are conducted to investigate the ultimate moment capacity, ductility characteristics of these strengthened connections. The test results showed that the specimen strengthened by single rib can achieve interstory drift angle more than 0.04 radian. Minor cracks were occurred at the tips of beam flanges. However, it did not affect the performance of the specimen. Another specimen was strengthened by additional wing plate in order to eliminate the cracks at tips of the beam flanges. Cracks occurred at the end of the wing plates cause brittle fracture of flanges. Based on these studies, conclusions and suggestions are proposed for Box-column connections.