Study on load distribution ratio of composite pre-tightened tooth joint by shear nonlinearity

IF 4 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.40.5.747

Gao Yifeng, Fei Li, Qilin Zhao, Jiangang Gao, Lin Shi, Zhiqing Zhao

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Abstract

Load distribution has a great influence on the mechanical properties of composite pre-tightened multi-tooth connection. To obtain the load distribution mechanism of composite pre-tightened multi-tooth joints, the multi-tooth joints were studied by experimental and theoretical methods. First, an experimental study was conducted on three-tooth specimens with different tooth depths and tooth lengths, and the failure mode, bearing capacity and load distribution mechanism of the specimens were obtained. Then, based on the nonlinear constitutive of interlaminar shear, an analytical model for load distribution of composite pre-tightened multi-tooth joint was proposed to research the multi-tooth load distribution mechanism. Finally, the theoretical and experimental results were compared. The research showed: (1) The theoretical results of the multi-tooth load distribution ratio were in good agreement with that of the experimental results, the maximum error between the theoretical value and the experimental value of the three-tooth joint was 17.44%, and the minimum error was only 2.35%; (2) The load distribution ratio of composite pre-tightened multi-tooth was uneven, for three-tooth joints, the values of load distribution ratio from large to small were: the first tooth, the third tooth and the second tooth.; (3) Multi-tooth load distribution ratio changed with the change of external load. The change of load distribution ratio was obvious in the early stage of loading, and tended to be gentle in the later stage of loading.

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基于剪切非线性的复合材料预紧齿连接载荷分配比研究

载荷分布对复合材料预紧多齿连接的力学性能影响很大。为获得复合材料预紧多齿接头的载荷分布机理，采用实验和理论方法对多齿接头进行了研究。首先，对不同齿深和齿长的三齿试件进行了试验研究，获得了试件的破坏模式、承载能力和载荷分布机理。然后，基于层间剪切的非线性本构，建立了复合材料预紧多齿接头的载荷分布解析模型，研究了多齿接头的载荷分布机理。最后，对理论和实验结果进行了比较。研究表明:(1)多齿载荷分配比的理论计算结果与实验结果吻合较好，三齿关节的理论值与实验值最大误差为17.44%，最小误差仅为2.35%;(2)复合预紧多齿载荷分配比不均匀，对于三齿关节，载荷分配比由大到小依次为:第一齿、第三齿、第二齿;(3)多齿载荷分配比随外载荷的变化而变化。加载前期荷载分配比变化明显，加载后期荷载分配比变化趋于平缓。

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来源期刊

Steel and Composite Structures 工程技术-材料科学：复合

CiteScore

8.50

自引率

19.60%

发文量

审稿时长

7.5 months

期刊介绍： Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.