plate reinforced square hollow section X-joints subjected to in-plane moment
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：chen Xi-xiang(陈希湘) CHEN Yu(陈誉) CHEN Dong-fen(陈栋芬)
文章页码：1002 - 1015
Key words：failure analysis; square hollow section (SHS) X-joints; plate reinforcement types; in-plane flexural property; ultimate capacity; initial stiffness; strain strength distribution; ductility
Abstract: The static test of 13 square hollow section (SHS) X-joints with different β and different types of plate reinforcement under in-plane moment in brace was carried out. Experimental test schemes, failure modes of specimens, moment-vertical displacement curves, moment-deformation of the chord, and strain strength distribution curves were presented. The effect of β and plate reinforcement types on in-plane flexural property of SHS X-joints was studied. Results show that punching shear of chord face disappears, brace material fracture appears and concave and convex deformation of chord decrease when either collar plates or doubler plates were welded on chord face. Moment-vertical displacement curves of all specimens have obvious elastic, elastic-plastic and plastic stages. As β increases, the in-plane flexural ultimate capacity and initial stiffness of joints of the same plate reinforcement type increase, but ductility of joints decreases. With the same β, the in-plane flexural initial stiffness and ultimate capacity of doubler plate reinforced joints, collar plate reinforced joints, and unreinforced joints decrease progressively. Thickness of reinforcement plate has no obvious effect on in-plane flexural initial stiffness and ultimate capacity of joints. As thickness of reinforcement plate increases, the ductility of reinforced X-joints decreases. The concave and convex deformation of every specimen has good symmetry; as β increases, the yield and ultimate deformation of chord decrease.
chen Xi-xiang(陈希湘)1, CHEN Yu(陈誉)2, 3, CHEN Dong-fen(陈栋芬)2
(1. College of Technology & Engineering, Yangtze University, Jingzhou 434023, China;
2. School of Urban Construction, Yangtze University, Jingzhou 434023, China;
3. College of Civil Engineering, Huaqiao University, Xiamen 361021, China)
Abstract:The static test of 13 square hollow section (SHS) X-joints with different β and different types of plate reinforcement under in-plane moment in brace was carried out. Experimental test schemes, failure modes of specimens, moment-vertical displacement curves, moment-deformation of the chord, and strain strength distribution curves were presented. The effect of β and plate reinforcement types on in-plane flexural property of SHS X-joints was studied. Results show that punching shear of chord face disappears, brace material fracture appears and concave and convex deformation of chord decrease when either collar plates or doubler plates were welded on chord face. Moment-vertical displacement curves of all specimens have obvious elastic, elastic-plastic and plastic stages. As β increases, the in-plane flexural ultimate capacity and initial stiffness of joints of the same plate reinforcement type increase, but ductility of joints decreases. With the same β, the in-plane flexural initial stiffness and ultimate capacity of doubler plate reinforced joints, collar plate reinforced joints, and unreinforced joints decrease progressively. Thickness of reinforcement plate has no obvious effect on in-plane flexural initial stiffness and ultimate capacity of joints. As thickness of reinforcement plate increases, the ductility of reinforced X-joints decreases. The concave and convex deformation of every specimen has good symmetry; as β increases, the yield and ultimate deformation of chord decrease.
Key words:failure analysis; square hollow section (SHS) X-joints; plate reinforcement types; in-plane flexural property; ultimate capacity; initial stiffness; strain strength distribution; ductility
