摘要
为改善钢管混凝土界面和节点力学性能,加强钢管与混凝土的组合效应,提出在钢管混凝土的钢管内设置开孔钢板纵肋,使其具有PBL连接件和加劲肋的双重作用;进行了无肋和设置PBL加劲肋2种截面形式的矩形钢管混凝土轴压短柱试验;分析了无肋和设置PBL加劲肋时,结构中节点剪力在钢管混凝土钢-混界面的传递模式。结果表明:与无肋试件相比,设置PBL加劲肋使得矩形钢管对混凝土的套箍作用得到加强,其轴压承载力提高了14%～28%,试件延性明显改善;PBL连接件能够有效缩短管壁剪力向核心混凝土的传递线路,改善节点区域的应力分布。PBL加劲型矩形钢管混凝土具有承载力高、钢-混组合效应明显的优势,并且构造简单、施工方便,对丰富和发展钢管混凝土在桥梁工程中的应用具有重要意义。
To improve the interface behavior between the tube and concrete column, a new type of concrete-filled steel tube inside placed by a longitudinal stiffener with PBL holes was proposed. It provided functions of both stiffness enhance and internal shear connection to the concrete-filled steel tube. An axial compression test was employed to investigate the improvement of bearing capacity of concrete-filled square steel tube stiffened with PBL shear connector. The shear bond between steel and concrete was analyzed for the concrete-filled tubes with and without PBL stiffener. The results show that the bearing capacity is enhanced by 14~/00 to 280/oo compared to that without PBL stiffener, and its ductility is also improved. The transfer distance of shear force from steel tube to concrete column is decreased dramatically with the aid of PBL stiffener. As a result, the PBL stiffener, welded on the tube surface inside, can effectively improve the mechanical property of concrete-filled steel tube, thus can provide a new enhancement measure for bridge construction.
出处
《建筑科学与工程学报》
CAS
北大核心
2012年第4期13-17,共5页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51178051)
关键词
矩形钢管混凝土
PBL剪力键
粘结强度
承载力
传力机理
concrete-filled square steel tube
PBL shear connector
bond strength
bearing capac- ity
load transmission mechanism
