Analysis of Axial Compressive Bearing Capacity of Composite Columns of Encased Section Steel-Steel Pipe Coal Gangue Concrete by Limit Equilibrium Theory
The composite column of encased section steel-steel pipe coal gangue concrete is a new type of structure that combines coal gangue concrete with encased section steel-steel pipe concrete,which can provide an effective way for the resource utilization of solid waste coal gangue.By the limit equilibrium theory,the actual stress situation of the composite column was analyzed to establish the axial compression bearing capacity formula.And the correct-ness of the formula was verified.On this basis,the influence of the main parameters such as steel pipe wall thick-ness,steel pipe strength,coal gangue concrete strength and section steel strength on the axial compressive bearing capacity of composite columns was explored.The results show that the established formula is in good agreement with the experimental results.The axial compressive bearing capacity increases with the thickness of the steel pipe wall.For every mm the thickness of the steel pipe wall increases,the axial compressive bearing capacity increases by about 7％,and the restrained stress of the steel pipe on coal gangue concrete increases by about 31％;For every 5 MPa the strength of coal gangue concrete increases,the axial compressive bearing capacity of the composite column in-creases by about 6％.As the thickness of the steel pipe wall increases and the strength of the steel pipe increases,the constraint stress of the steel pipe on the core coal gangue concrete increases.The axial compressive bearing capacity of the steel section increases with the increase of the steel section strength,and the axial stress of the coal gangue concrete increases with the increase of its strength.This conclusion can provide a theoretical basis for the engineer-ing design of embedded steel tube coal gangue concrete composite columns.
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