基于构件-节点一体化设计纤维增强复合材料桁架结构节点性能研究

RESEARCH ON CONNECTION PERFORMANCE OF FRP TRUSS STRUCTURE BASED ON INTEGRATED PERFORMANCE OF MEMBER AND CONNECTION

针对复合材料单向拉挤型材节点连接效率低而导致构件强度利用率低等问题,采用改变纤维铺层设计,增加±45°及90°纤维布设的方式,改善节点性能及破坏模式。采用试验研究与数值模拟相结合的方法,分析铺层角度对构件拉伸性能及节点性能的影响。研究结果表明:改变铺层角度,可有效提高节点承载性能、改善破坏形态。基于构件-节点一体化设计,确定桁架结构用拉挤型材纤维布设比例:0°铺设不小于60%、±45°铺设不小于20%、90°铺设不大于20%。

In the hight of the lower strength utilization efficiency of structural members due to lower bolted connection efficiency for unidirectional pultruded fiber reinforced polymer(FRP)profiles,multi-directional composites were considered as an effective way to improve the performance of bolted connection by adding 45°and 90°layers.Experimental study and numerical analysis of the effects of the lay angle on the tensile properties of member and connecting behaviors were conducted.The results showed that changing the lay angle of composites could effectively improve the bearing capacity and failure mode of the connections.Based on the integrated design of the member and connection,the lay sequences of pultruded profiles for truss structures were determined that the lay FRP sheets at 0°were not less than the proportion of 60%;the sheets at±45°,not less than 20%;and the sheets at 90°,not less than20%.