【摘要】：為了探究復合材料空間桁架橋中關鍵節(jié)點預緊力齒連接接頭在多向受力狀態(tài)下的應力分布,對復合材料空間桁架橋建立多尺度有限元模型。該多尺度模型不僅可以同時獲得桁架橋整體結構性能與局部接頭應力狀態(tài),還可以有效反映兩者的相互作用關系。通過該模型,對接頭在多向受力狀態(tài)下的應力分布展開研究,研究表明:預緊力齒接頭受力之后,齒面正應力較過盈裝配完成時有5 MPa以內(nèi)的衰減;且多向受力接頭較單向受力接頭衰減緩和,衰減后多向受力接頭齒面正應力略高于單向受力接頭齒面正應力;多向受力接頭各齒荷載分配比例與單向受力基本一致,均為兩側高中間低;多向受力接頭復合材料管橫向剪切應力較單向受力接頭有一定增大,但最不利荷載工況下的橫向剪切應力為15.7 MPa,遠小于材料橫向剪切強度,接頭處于安全狀態(tài)。所得結果可為復合材料預緊力齒接頭設計提供參考依據(jù)。
[Abstract]:In order to study the stress distribution of the key joints of the composite space truss bridge under multi-direction stress, a multi-scale finite element model was established for the composite space truss bridge. The multi-scale model can not only obtain the global structural performance of truss bridge and the stress state of local joints simultaneously, but also reflect the interaction between them. Through this model, the stress distribution of the joint under multi-direction loading is studied. The results show that the normal stress on the tooth surface decreases within 5 MPa after the pretension force joint is finished. Compared with unidirectional joint, the normal stress of multidirectional joint is slightly higher than that of unidirectional joint. The load distribution ratio of each tooth of multi-directional joint is basically the same as that of unidirectional force, and it is both high and middle low on both sides. The transverse shear stress of multidirectional joint composite tube is higher than that of unidirectional joint, but the transverse shear stress of 15.7 MPa, under the most unfavorable load condition is much smaller than the transverse shear strength of the material, and the joint is in a safe state. The results can provide a reference for the design of composite pretightening tooth joint.
【作者單位】： 解放軍理工大學野戰(zhàn)工程學院;南京工業(yè)大學機械與動力工程學院;解放軍后勤工程學院;
【基金】：國家自然科學基金資助項目(11372355)
【分類號】：U441

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