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为研究高温后型钢再生混凝土轴压柱的破坏形态、损伤劣化及剩余承载能力,以再生粗骨料取代率、温度、恒温时间、型钢保护层厚度、含钢率及箍筋间距为变化参数,设计48个试件进行高温后静力加载试验,获取了高温后试件的烧失率及受力破坏全过程的荷载-变形曲线,并分析了各变化参数对试件剩余承载力、损伤过程和位移延性等的影响;采用有限元分析软件ABAQUS对高温下试件的温度场进行数值计算,得到了截面混凝土高温损伤分布情况,综合试验结果与有限元分析结果,提出了高温后型钢再生混凝土柱轴心受压剩余承载力的计算方法。研究结果表明:温度越高,试件在加载过程中裂缝的出现、贯穿及混凝土剥落越早;承载力随着温度的提高、受火时间的增加、型钢保护层厚度及含钢量的减小而降低;延性随着温度的提高、型钢的混凝土保护层厚度的增大先降低后提高,随着含钢率和配箍率的增大而逐渐增加;试件的初始损伤值随着温度的升高和受火时间的增加而逐渐增大;试件截面温度随着取代率的增加逐渐降低,随着经历最高温度的上升而逐渐升高。
In order to study the failure morphology, damage deterioration and residual bearing capacity of rehabilitated concrete post-core columns with high temperature, taking the replacement ratio of coarse aggregate, temperature, constant temperature time, the thickness of steel protective layer, the steel content and the stirrup spacing as the changing parameters, 48 specimens were designed for static loading after high temperature, the burning-loss rate and the load-deformation curve of the specimen were obtained after high temperature, and the influence of various parameters on the residual bearing capacity, damage process And displacement ductility. The temperature distributions of specimens under high temperature were numerically calculated by finite element analysis software ABAQUS. The damage distribution of concrete under high temperature was obtained. Based on the comprehensive test results and finite element analysis results, the post-high-temperature post-cast steel recycled concrete Calculation Method of Residual Bearing Capacity of Column Axial Compression. The results show that the higher the temperature is, the higher the temperature is, the higher the temperature is. The higher the temperature is, the higher the temperature is. The higher the temperature is, the higher the temperature is. And the ductility decreases with the increase of temperature. The thickness of the concrete protective layer increases firstly and then decreases with the increase of the steel content and the ratio of the stirrup. The initial damage value of the specimen increases with the increase of the temperature Increasing with the increase of fire time. The cross-section temperature of the specimen gradually decreased with the increase of the substitution rate and gradually increased with the increase of the maximum temperature.