Finite Element Analysis of Spontaneous-Combustion Coal Gangue Concrete Filled Square Steel Tube Short Columns under Axial Compressive
In order to study the influence of design parameters on the axial bearing capacity of spontaneous-combustion coal gangue(SCGA)concrete filled square steel tube short columns under different replacement rates of coal gangue coarse aggregate and propose the axial bearing capacity calculation formula,the finite element(FE)model is established by ABAQUS,and the accuracy of the model is verified by comparing with the experimental results.According to the FE model,this paper analyzed the stress distribution and load distribution of the specimens,and the influence of the main parameters of the specimens on its ultimate strength under 5 kinds of SCGA replacement ratios is analyzed by the control variable method.The results show that under the same design parameters,the ultimate strength of the specimen decreases with the increase of the replacement ratio of SCGA,and the maximum reduction is not more than 14%.When the section size of the specimen is fixed,the influence of the steel content on the ultimate strength of the specimen is the most significant.The increase of the steel ratio from 7.4%to 20.3%makes the ultimate strength of the specimen increase by 68.85%on average under different replacement ratios.The addition of SCGA does not significantly deteriorate the axial bearing capacity of the components.According to the'Technical Code for Concrete Filled Steel Tubular Structures'(GB 50936-2014),the calculation error after introducing the influence coefficient of coal gangue coarse aggregate replacement rate is within 5%,which can provide reference for related research.
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