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Cyclic testing of weak-axis column-tree connections with formation of plastic hinge at beam splice
Oh, Keunyeong,Chen, Liuyi,Hong, Sungbin,Yang, Yang,Lee, Kangmin 테크노프레스 2015 Earthquakes and structures Vol.8 No.5
The purpose of this study was to evaluate the seismic performance of weak-axis column-tree type connections used in steel moment frames. These connections are composed of a shop-welded and fieldbolted steel structure and can improve welding quality. On this basis, column-tree type connections are widely used in steel moment resisting frames in Korea and Japan. In this study, splices designed with a semirigid concept regarding the seismic performance of column-tree connections were experimentally evaluated. The structures can absorb energy in an inelastic state rather than the elastic state of the structures by the capacity design method. For this reason, the plastic hinge might be located at the splice connection at the weak-axis column-tree connection by reducing the splice plate thickness. The main variable was the distance from the edge of the column flange to the beam splice. CTY series specimens having column-tree connections with splice length of 600 mm and 900 mm were designed, respectively. For comparison with two specimens with the main variable, a base specimen with a weak-axis column-tree connection was fabricated and tested. The test results of three full-scale test specimens showed that the CTY series specimens successfully developed ductile behavior without brittle fracture until 5% story drift ratio. Although the base specimen reached a 5% story drift ratio, brittle fracture was detected at the backing bar near the beam-to-column connection. Comparing the energy dissipation capacity for each specimen, the CTY series specimens dissipated more energy than the base specimen.
Cyclic testing of steel column-tree moment connections with various beam splice lengths
이강민,Rui Li,Liuyi Chen,오근영,김강석 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.16 No.2
The purpose of this study was to evaluate the cyclic behavior of steel column-tree moment connections used in steel moment resisting frames. These connections are composed of shop-welded stub beam-to-column connection and field bolted beam-to-beam splice. In this study, the effects of beam splice length on the seismic performance of column-tree connections were experimentally investigated. The change of the beam splice location alters the bending moment and shear force at the splice, and this may affect the seismic performance of column-tree connections. Three full-scale test specimens of column-tree connections with the splice lengths of 900 mm, 1,100 mm, and 1,300 mm were fabricated and tested. The splice lengths were roughly 1/6, 1/7, 1/8 of the beam span length of 7,500 mm, respectively. The test results showed that all the specimens successfully developed ductile behavior without brittle fracture until 5% radians story drift angle. The maximum moment resisting capacity of the specimens showed little differences. The specimen with the splice length of 1,300 mm showed better bolt slip resistance than the other specimens due to the smallest bending moment at the beam splice.
Cyclic testing of weak-axis steel moment connections
이강민,Rui Li,정희택,Liuyi Chen,오경환 국제구조공학회 2013 Steel and Composite Structures, An International J Vol.15 No.5
The seismic performance of six types of weak-axis steel moment connections was investigated through cyclic testing of six full-scale specimens. These weak-axis moment connections were the column-tree type, WUF-B type, FF-W type, WFP type, BFP-B type and DST type weak-axis connections. The testing results showed that each of these weak-axis connection types achieved excellent seismic performance, except the WFP and the WUF-B types. The WFP and WUF-B connections displayed poor seismic performance because a fracture appeared prematurely at the weld joint due to stress concentrations. The column-tree type connection showed the best seismic behavior such that the story drift ratio could reach 5%.
Cyclic Testing of Steel Column-Tree Moment Connections with Weakened Beam Splices
오근영,Rui Li,Liuyi Chen,홍성빈,이강민 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
Traditionally, the beam splice assemblies of column-tree connections are designed according to the full-strength designprinciple. Actually, the beam splice is set up at a certain distance from the column face, thus the plastic moment capacity ofthe beam splice does not need to be greater than the plastic moment capacity of the beam. This paper experimentally presentsthe effects of the weakened beam splice on the seismic performance of column-tree steel moment connections. Cyclic tests oftwo column-tree connection specimens with weakened beam splices and one specimen following the full-strength designprinciple were conducted to verify their inelastic behavior and failure modes. The test results showed that the moment resistingcapacity of the column-tree connection specimens with weakened beam splices did not obviously decrease. Also, their energydissipation capacity was better than that of the specimen following the full-strength design principle.