方钢管自密实再生混凝土偏压短柱的力学行为

摘要

The goals of this paper are to investigate the mechanical behavior of the eccentric loaded square self-compacting recycled aggregate concrete filled steel tube (SCRACFST) stub columns and examine the effects of different parameters on the load-carrying capacity and the peak deflection of the eccentric loaded square SCRACFST stub columns.In order to study the failure patterns,the load-deflection curves,the load-carrying capacity and the peak deflection of the eccentric loaded square SCRACFST stub columns,several square SCRACFST stub columns were tested under eccentric compression.The test results show that the eccentric loaded square SCRACFST stub columns are failure due to the lateral deflection.The load-deflection curves of the eccentric loaded square SCRACFST stub columns can be divided into elastic stage,elastic-plastic stage and descending stage.The recycled coarse aggregate replacement ratio has little significant effects on the load-carrying capacity of the eccentric loaded square SCRACFST stub columns,but has significant effects on the peak deflection of the eccentric loaded square SCRACFST stub columns.The eccentricity ratio and the steel ratio have significant effects on the load-carrying capacity and the peak deflection of the eccentric loaded square SCRACFST stub columns.It is feasible to apply the self-compacting recycled aggregate concrete to the square concrete-filled steel tube stub columns.The research finds can provide theoretical basis for the engineering application of the SCRACFST stub columns.%目的 研究方钢管自密实再生混凝土偏压短柱的力学行为,揭示不同参数对其承载力和峰值挠度的影响规律.方法 通过方钢管自密实再生混凝土短柱的偏心受压试验,研究方钢管自密实再生混凝土偏压短柱的破坏形态,荷载-挠度关系曲线、承载力和峰值挠度.结果 方钢管自密实再生混凝土偏压短柱由于发生侧向挠曲而破坏.方钢管自密实再生混凝土偏压短柱的荷载-挠度关系曲线可分为弹性阶段、弹塑性阶段和下降阶段.再生粗骨料替代率对方钢管自密实再生混凝土偏压短柱的承载力的影响不显著,而对其峰值挠度的影响较显著.偏心率和含钢率对方钢管自密实再生混凝土偏压短柱的承载力和峰值挠度有显著影响.结论 将自密实再生混凝土应用于方钢管混凝土中是可行的,研究成果可为方钢管自密实再生混凝土短柱的工程应用提供理论依据.