EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOR OF PREFABRICATED COMPOSITE BEAMS WITH WEB OPENINGS
Taking the spacing of high-strength bolts as a variable parameter,three simply supported composite beams are loaded under a monotonically increasing static load at the mid span to study the mechanical behavior of composite beams with web openings connected by high-strength bolts.The research focuses on the force perfor-mance of high-strength bolts in the assembly of composite beams,the ultimate bearing capacity of prefabricated specimens,the failure mode,and deformation characteristics of the test specimens.The results show that the failure mode of composite beams connected by high-strength bolts is typical shear failure.The bolt spacing had a signifi-cant impact on the overall stiffness of the assembled composite beam,in which the smaller the spacing of high-strength bolts,the stronger the composite effect of composite beams,the greater the overall stiffness,and the smaller the deformation during failure.The pretension of high-strength bolts and the tolerance of bolt holes also have great influence on the load-slip behavior of composite beams.The high-strength bolt connectors in the area above the hole are prone to offset and pull-out,and further reinforcement measures should be taken in the design and construction to optimize the performance.
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