摘要
为了研究竹-混凝土组合梁的组合效率及剪力连接件的影响,进行了3根竹-混凝土组合梁和1根对比竹梁的试验,组合梁的剪力连接件形式分别为销栓型、凹槽型和凹槽-销栓型.研究结果表明:销栓型连接件竹-混凝土组合梁发生底面竹纤维受拉断裂的破坏,凹槽型组合梁和凹槽-销栓型组合梁发生凹槽底部水平位置处竹材的纵向剪切破坏;与竹梁相比,竹-混凝土组合梁在跨中挠度为跨度1/250时的荷载提高了3.18~3.74倍,等效截面刚度为刚性连接组合梁截面刚度的70%;凹槽型连接件和凹槽-销栓型连接件的组合梁,界面滑移小于1.2 mm,荷载挠度曲线呈线性,连接件表现出刚性连接性能.
Three bamboo-concrete composite beams and one companion bamboo beam were tested to investigate the composite efficiency and the effects of shear connectors on bamboo-concrete composite beams. The shear connectors of these composite beams consisted of dowels, notches or notch-dowels. The results indicate that the composite beams connected with dowels fail owing to the tensile fracture of the bottom-most bamboo fiber. Furthermore, the composite beams connected with notches or notch- dowels fail owing to the shear connectors. The longitudinal shear failure occurred in the bamboo along the horizontal line located at the bottom of the notches. Compared to the companion bamboo beam, the load corresponding to the displacement of the 1/250 span of the bamboo-concrete composite beam increases by 3. 18 to 3. 74 times and the sectional stiffness is significantly enhanced. The effectivesectional stiffness of these composite beams reaches up to 70% of the sectional stiffness of the full composite beams. For the composite beams connected with notches or notch-dowels, the interfacial slip is smaller than 1. 2 mm, the load-deflection relationship is linear, and the connectors exhibit the performance of a rigid connection.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2017年第6期1148-1155,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51208262
51778300)
江苏省自然科学基金资助项目(BK20151520)
江苏省"333"工程和"青蓝工程"资助项目(BRA2016421)
江苏省高校优势学科建设工程资助项目(PAPD)
关键词
竹
组合结构
混凝土
梁
剪力连接件
受弯性能
bamboo
composite structures
concrete
b e a m s
shear connectors
flexural characteristics
