复合材料拉挤方管型材螺栓节点承载力试验

发布时间：2018-06-06 18:22

本文选题：复合材料 + 拉挤型材　；参考：《复合材料学报》2014年03期

【摘要】：复合材料型材是采用工业化拉挤工艺生产的截面形状一致、性能稳定的连续构件(如:方形、工字形、槽形等),其节点连接技术是难点。重点开展了复合材料型材节点螺栓机械连接的试验研究与理论分析,研究了螺栓节点孔径、端距、壁厚等参数对复合材料型材节点极限承载力的影响规律,提出了拉挤复合材料型材螺栓孔的金属垫圈孔壁增强技术,进而拟合了拉挤型材螺栓节点连接的设计公式。研究结果表明:复合材料方管拉挤型材在螺栓连接局部挤压的破坏模式下,其极限承载力与孔径和板厚的乘积(d·t)呈线性关系,接头处的破坏形式和连接接头端距与孔径的比值相关。在挤压破坏模式下,当接头板件壁厚一定时,极限承载力的增量随着孔径的增大而减小。螺栓孔采用金属垫圈增强技术,可以大幅度提高节点承载能力(提高63%)。
[Abstract]:Composite profile is a kind of continuous member (such as square, I-shaped, groove, etc.) which is produced by industrial pullout process, and its joint connection technology is difficult. The experimental study and theoretical analysis of mechanical connection of composite joint bolts are carried out, and the influence of the parameters such as aperture, distance and wall thickness on ultimate bearing capacity of composite joint is studied. In this paper, the reinforcement technology of metal gasket hole wall for bolt hole of extruded composite material is put forward, and the design formula of joint connection of bolt joint of extruded profile is fitted. The results show that the ultimate bearing capacity of composite square tube extruded profile is linearly related to the product of aperture and plate thickness under the failure mode of local extrusion of bolt connection. The failure mode of the joint and the ratio of the end distance to the aperture of the joint are related. Under the extrusion failure mode, the increment of ultimate bearing capacity decreases with the increase of pore diameter when the wall thickness of the joint plate is fixed. The bolted hole adopts metal washer reinforcement technology, which can greatly improve the bearing capacity of the joint.
【作者单位】：南京工业大学土木工程学院;
【基金】：国家自然科学基金重点项目(51238003);国家自然科学基金青年项目(50978134)
【分类号】：TB332;TB302;TU399

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