Experimental study on performance of concrete large eccentric compressed columns strengthened by UHPC constrained by spiral stirrups
Four approximately 1/2 full-foot UHPC(ultra-high performance concrete)reinforced ordinary concrete columns and one unreinforced ordinary concrete comparative column were designed for large eccentric compression test research,aiming to study the effectiveness of the UHPC reinforcement method constrained by square spiral stirrups,mainly to study the influence of different spiral stirrup spacing and whether the reinforcement layer is equipped with spiral stirrups on the mechanical performance and deformation of ordinary concrete large eccentric compressed columns.The failure phenomenon,bearing capacity,lateral deflection,steel bar strain and concrete compressive strain of the test column were analyzed.The experimental results show that the reinforcement effect of UHPC constrained by square spiral stirrups is remarkable.This reinforcement method can greatly improve the bearing capacity of components and can effectively improve the ductility of components.The basic calculation assumptions for were proposed,and the UHPC reinforcement of eccentric columns constrained by spiral stirrups was derived.The bearing capacity calculation formula of the large eccentric compressed normal section of columns strengthened by UHPC constrained by spiral stirrups and was derived,and the error between the calculated value and the experimental value of bearing capacity is small,and the research results can provide a reference for the engineering design calculation of this kind of reinforcement method.
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