| Aluminum alloy strip-timber composite beam can fully exert its advantages of environment-protection,low carbon,light,good anti-seismic property,anti-corrosion,convenient construction and so on,and becomes a new type of architectural structure system,bringing great value of economic benefits.At present,steel-timber composite structure has been widely used and researched around the world,but the corrosion problem of steel limited the appliance and promotion in high temperature and humidity environmental conditions,although the problem of reducing the strength of knots has been solved,the bending capacity has been improved,which is more suitable for the aluminum alloy strip-timber composite beam.The experimental research and numerical analysis on flexural properties have been present in this paper.For the development and utilization of OSB board with knowable in properties in the field of architecture,the OSB board as important objects in aluminum alloy strip-timber composite beams for research and analysis.This paper presents T-section OSB board-aluminum alloy strip composite beam,and the experimental research and numerical analysis on flexural properties have been present in this paper.The main points are as the followings:(1)Material tests for timber,OSB board and aluminum alloy strip are studied in this paper and it concludes their indicators of property which provide an important basis for experimental research and numerical analysis of the composite beam.The experimental research on flexural behavior of 2 composite beams which contain two types of the timber,one is log called pseudotsuga menziesii pine,and another is artificial timber called OSB board.The paper has present an analysis of the effectiveness of the construction methods for the reinforcement mainly in two ways,which are strengthening the end of beam and controlling the space of the screw.The comparison of failure mode,the load-displacement curve and the load-strain curve are obtained to confirm its good bending performance.And self-drilling screw connection can ensure cooperation work between timber and aluminum alloy strip.The method of the end of composite beam reinforcement and the space controlling of the screw can get full use of strip strength,and the adverse effects of slip effect has been reduced.(2)This paper carries out the simulation with the finite element analysis software ANSYS and the 2 specimens of composite beams have been calculated.The simulation of the models showed that the results of finite element analysis are according to the test results,which indicates the feasibility of the finite element simulation.Based on finite analysis,the major influence factors of bending capacity of composite beam are analyzed,including the thickness of aluminum alloy strip and timber beam,the space between the rip in the T-section OSB board-aluminum alloy strip composite beam.The results showed that the increased thickness of aluminum alloy strip and timber are the most effective approaches to improve bending capacity of composite beam.And capacity of the composite beam could be improved by the decreased space between the rip.And the bending capacity comparison of aluminum alloy strip-timber composite beam with timber beam and steel-timber concrete composite with aluminum alloy strip-timber concrete composite beam have presented.The comparison of the aluminum alloy strip and steel strip shows that it is feasible of aluminum alloy strip of composite beam.(3)This paper deduces the simplified formula of bending capacity of aluminum alloy strip-timber composite beam through adopting the static linear-elastic analysis and capacity superposition method.The formula results coincide with test results fairly,which can provide certain reference basis for the application of practical engineering henceforward. |
