Study on mechanical properties of composite beams hybridly connected by structural glue and bolts
To study the mechanical properties of steel-wood composite beams under bolted connections and adhesive bonding com-bined with bolted connections,a three-dimensional finite element solid model was established to carry out parametric analysis.Parameters such as bolt spacing,stiffener and flange connection were set up to study the influence laws and failure mechanisms on the stiffness,the bearing capacity and deformation capacity of the composite beams.The results show that the failure characteristics of steel-glulam composite beams mainly include degumming and warping in end interface,bolt shear,plastic deformation of flange wood,and local buckling of steel plate.The tensile and compressive stress concentrations are obvious on the outer surface of the upper and lower flange of the composite beam,and the stress and strain transfer and distribution path near the steel and wood will be changed at the bolt hole during the loading process,and the yield failure is easy to occur first.The composite connection of structural adhesive and bolt can effectively enhance the overall stiffness of the composite beam,the bearing capacity of the flange can be fully used due to a 30.65%increase of the yield load.
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