Experimental Study On Flexural Behavior Of Corrugated Steel Plate Composite And Reinforced Structure

Corrugated steel plate with its short construction time,low cost,good deformation characteristics is widely used in highway engineering for a long time.However,the single-layer corrugated steel plate structures that simply increasing the waveform and plate thickness will cause stress overlimit or local instability in the case of large span and high cover.In order to adapt to the development of bridge and expand the field of corrugated steel to other fields such as industrial and civil buildings,underground structures,the flexural behavior of the corrugated steel reinforced structures and corrugated steel plate-concrete composite structures was studied to provide the reference for the practical application and research in the future.For the study,the two types of specimens,a total of seven,were made.The static loading tests were completed and the failure process and failure modes were recorded.The load-deflection curves and the load-strain curves,etc.were obtained.With the reference of the calculation method of steel-concrete composite structures,the calculation method of the flexural performance of the specimens was proposed and checked by the experimental results.The finite element software ABAQUS was used to conduct nonlinear analysis on all the specimens,and the rationality of the finite element model was verified by comparing with the test results.The influence of steel plate thickness,steel plate strength,concrete strength and other factors on the flexural performance of these two structures was analyzed by the finite element method.Test and analysis results show that for the reinforced structures,there is no obvious failure in the loading process and the specimens still have good bearing capacity after entering the plastic stage.Compared with the single steel plate,the flexural rigidity of the reinforced specimens increased greatly,and it can be significantly improved by increasing the plate thickness and filling concrete.The failure modes of all the composite structure specimens are longitudinal shear failure,appeared as the obvious separation between the steel plate and the concrete.The crack width in the shear span area is large.The failure process of composite structure specimens can be divided into elastic stage,elastoplastic stage and plastic stage.From the general trend,the greater the concrete thickness is,the greater the specimen stiffness and the stronger the ultimate bearing capacity will be.Nonetheless,the increase in concrete thickness will lead to the use of the materials insufficiently.Comparing the bearing capacity of the two groups of specimens,the stiffness of composite structure is greater than that of reinforced structure in the initial elastic stage of loading,but the latter have excellent bearing capacity and ductility.The reinforced structure is simple and convenient in design and construction,which are suitable for structures with small stiffness requirements,especially for embedded bridge and culvert structures.The calculation methods of flexural strength and flexural stiffness of the two groups of specimens are proposed.The results are in good agreement with the experimental results.The calculation method can describe the bearing capacity of these two structures,and provide reference for the actual engineering design.