Abstract
Spatial joints with end‐plate connections show significant spatial coupling effects under spatial loading. Mechanical behaviour and failure modes of these spatial joints differ from those of planar joints. This study involved experiments and finite element analyses with respect to planar joints with end‐plate connections under static load. The numerical results agreed well with the experimental data, and this verified the adequacy of the finite element analyses. Then, finite element models of the spatial interior joint, exterior joint, and corner joint were established to analyse the difference between the mechanical behaviour of spatial joints and planar joints. The component method was used to analyse components contributing to the initial stiffness of spatial joints. An initial rotation stiffness calculation model of spatial joints was proposed based on the deformation of joints. The findings indicated that results of the calculation models were in good agreement with those of the finite element analyses, and this proved that the calculation model proposed in this study could act as a reference method.
Highlights
Joints are an important part of an entire structure
Simoes da Silva [9] presented a conceptual design model of spatial joints. is conceptual design model was a combination of the calculation models of spatial joints based on the component method principle
Loureiro et al [10] investigated spatial joints with end-connections on the major axis and minor axis. e results indicated that minor-axis connections offered a higher degree of improvement to the rotation stiffness of the joints when compared with that of major-axis connections
Summary
Joints are an important part of an entire structure. Some previous studies [1, 2] examining beam-column connections focused on in-plane behaviour. E behaviour of the frame structure joints depends on the combined effect of the major-axis and minor-axis connections. Loureiro et al [10] investigated spatial joints with end-connections on the major axis and minor axis. Gil et al [11] used an experimental study and finite element analyses to investigate the interaction between major-axis and minor-axis connections of spatial joints. E interaction stiffness effect between the major axis and minor axis was not investigated before This effect could not be neglected in mechanical behaviour research of spatial joints. Is study investigated the rotation stiffness of the spatial joints considering the interaction stiffness effect between the major axis and minor axis. E theoretical rotational stiffness calculation method of the spatial joint was developed, and the result proved to be accurate Differences in the initial rotation stiffness between spatial joints with end-plate connections and planar joints were evaluated. e theoretical rotational stiffness calculation method of the spatial joint was developed, and the result proved to be accurate
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