| In recent years,the rapid economic development worldwide has had a great impact on the ecological environment,and environmental protection has begun to receive more and more attention.Facing the increasingly serious environmental problems,the country began to vigorously promote the application and development of prefabricated buildings.Steel and wood are two important materials in prefabricated buildings.The research and application of such structures are also increasing.As a new type of composite beam,H-shaped steel-wood composite beam has the advantages of low energy consumption of wood,high air permeability,good stability,and less pollution;the steel is light and high strength,the degree of assembly is high,and the construction period is short.It has the advantages of less construction waste,etc,and its research is of great significance to the sustainable development of the national environment.In this paper,three hot-rolled H-beam-larch composite beams and one pure steel beam were subjected to flexural bearing capacity tests.The composite beams are divided into two different types of combination forms,A and B,of which the type A combination is in H-shaped steel.The two sides of the web are connected with larch wood by structural glue to form a composite beam.The type B composite beam is a larch wood glued on both sides of the H-shaped steel web and penetrates the bolts at the same time.Through the three-point monotonic static grading loading of the composite beam,observe the deflection change,failure phenomenon and form of the specimen during the experiment,and study whether the four beams have different cross-sectional dimensions with or without wooden boards,added bolts,and H-shaped steel.Under the circumstances,the ultimate bearing capacity of the test piece is changed.The combined effects of larch and hot-rolled H-beam materials are studied.The research results of the bending capacity and calculation analysis of the composite beam are as follows:(1)Through the wood properties of larch wood,some basic mechanical performance parameters such as tensile strength,compressive strength,flexural strength and elastic modulus required for the test are obtained.Provide a basis for bending performance research.(2)The bending bearing capacity test of the H-shaped steel-larch composite beams.showed that the overall performance of the H-shaped steel-larch composite beams was good.Bonding wood planks on both sides of the steel beam web can improve the bearing capacity,and the form of the member is more reasonable and effective;increasing the cross-sectional size of the H-beam in the steel-wood composite beam can further improve the bearing capacity of the composite beam;when using structural adhesive bonding In the case of steel and wood,adding bolt anchoring can also greatly improve the bearing capacity of the composite beam.(3)The superposition principle is used to simplify the calculation of the ultimate bearing capacity of H-shaped steel-larch composite beams.Comparing the calculation results with the test results,the data is in good agreement,which can provide a design reference for the practical application of such composite beams.(4)Use the ABAQUS finite element simulation software to model the specimen L-4,and analyze the bending capacity of the model.By comparing with the test results,the data agrees well,which proves the rationality of the finite element simulation. |
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