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％).
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