STRESS ANALYSIS OF COMPOSITE PRE-TIGHTENED TEETH CONNECTIONJOINT UNDER MULTIAXIAL LOADING CONDITION

Abstract

Abstract: To explore the composite space truss bridge key node pre-tightened teeth joint stress distribution under the multiaxial loading state, multiscale finite element model of the composite space truss bridge was established. The multi-scale model can not only obtain the overall structural performance of the truss bridge and the stress distribution of the local joint, but also can effectively reflect the interaction between the two. Through this model, the stress distribution of the joint in the multi-directional loading state is studied. The results show that when the joint force is applied, the normal stress of the tooth surface attenuation is within 5 MPa with respect to when the assembly is completed, and the multi-directional force joint attenuation is mitigatory relative to the one-way force connector. After the attenuation, the normal stress of the multi-direction joint is slightly higher than that of the uniaxial joint. The ratio of each tooth load distribution of the multi-directional force joint is basically the same with that of the unidirectional force joint, and distribution is high on both sides and low in the middle. The transverse shear stress of the composite of the joint is higher than that of the uniaxial force joint, but the transverse shear stress is much smaller than the transverse shear strength of the material. The joint is in the safe state. The results can provide a reference for the design of composite pre-tightened teeth joint.

Key words: FRP space truss bridge, pre-tightened teeth connection, multiscale finite element, multiaxial loading state, stress analysis

CLC Number:

TB332

YAN Xiao-qiang, LIU Ya-wen, ZHAO Qi-lin, LI Fei. STRESS ANALYSIS OF COMPOSITE PRE-TIGHTENED TEETH CONNECTIONJOINT UNDER MULTIAXIAL LOADING CONDITION[J]. Fiber Reinforced Plastics/Composites, 2017, 0(11): 25-31.

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