基于多因素的钢管混凝土界面黏结性能分析与强度预测模型评价
赵轩 , 杨晨 , 胡朝晖 , 李贤 , 聂影 , 刘俊 , 廖栩 , 刘西光
建筑钢结构进展 ›› 2025, Vol. 27 ›› Issue (11) : 75 -87.
基于多因素的钢管混凝土界面黏结性能分析与强度预测模型评价
Analysis of Interfacial Bond Behavior and Strength Prediction Model Evaluation of Concrete-Filled Steel Tube Based on Multiple Factors
为研究混凝土骨料粒径、钢管径厚比、长径比、钢管内壁粗糙程度与疲劳荷载对钢管混凝土(concrete-filled steel tube, CFST)界面黏结性能的影响,共设计了9个试件进行推出试验,通过荷载-滑移曲线以及推出试验过程中钢管外表面纵向应变与环向应变的分布情况,分析了CFST界面黏结强度与黏结刚度,研究结果表明:试件的荷载-滑移曲线均呈现出自由端的位移滞后于加载端的位移的现象,且随着加载的进行,自由端的位移增量逐渐与加载端的位移增量同步;CFST柱的黏结性能随钢管径厚比的增大而减小、随钢管内壁粗糙程度的降低而减小、随长径比的增大而减小;细骨料混凝土与疲劳作用均会降低CFST柱的黏结性能;钢管外表面纵向应变随距加载端距离的增大而增大,且黏结破坏后,荷载在钢管上呈现不均匀传递的现象;文中对现有的CFST黏结强度模型与试验数据进行了整理,并分析其吻合度,随后基于统计分析,以混凝土强度、CFST柱径厚比、长径比为参数,回归拟合出一个新的黏结强度计算公式,该公式计算结果与实际数据吻合较好。
In order to study the effects of concrete aggregate size, steel tube diameter-to-thickness ratio, length-to-diameter ratio, roughness of steel tube inner wall and fatigue load on the interface bonding properties of concrete-filled steel tube(CFST), 9 specimens were designed and push-out tests were carried out. The interface bonding strength and bond stiffness were analyzed by load-slip curve and the distribution of longitudinal and circumferential strains on the outer surface of steel tube during the push-out test. The results show that the displacement of the free end lags behind that of the loading end, and the displacement increment of the free end gradually synchronises with that of the loading end during the loading process. The bonding properties of CFST columns decrease with the increase of the diameter-to-thickness ratio of steel tube and length-diameter ratio, and with the decrease of the inner roughness of steel tube. Fine aggregate concrete will reduce the bond performance, and fatigue will significantly reduce the bond performance of CFST columns. The longitudinal strain of the outer surface of the steel tube increases with the increase of the distance from the loading end, and the load is not uniformly transferred on the steel tube as the bonding is destroyed. The existing CFST bond strength model and test data were sorted out and analyzed. Based on the method of statistical analysis, a bond strength calculation model was fitted with the concrete strength, diameter-to-thickness ratio and length-to-diameter ratio as parameters, which is in good agreement with the actual data.
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