钢管初应力对内配型钢的圆钢管混凝土柱受压性能影响  

Study on compressive performance of steel-reinforced concrete-filled circular steel tubular members considering preload on steel tubes

作　　者：贾志路 史艳莉[1] 王文达[1] 鲜威 JIA Zhilu;SHI Yanli;WANG Wenda;XIAN Wei(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《建筑结构学报》2022年第6期63-74,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(51768038,52168020)。

摘　　要：为研究钢管初应力对内配型钢钢管混凝土构件后期受力性能的影响,共设计了12根内配型钢圆钢管混凝土柱进行受压性能试验研究,试验主要参数为初应力系数和荷载偏心率。通过试验研究了内配型钢圆钢管混凝土柱的变形过程、破坏形态及不同参数对构件荷载-变形曲线和受力性能的影响。试验结果表明:初应力系数及荷载偏心率对内配型钢圆钢管混凝土柱最终的破坏形态影响较小,但不同长细比的构件破坏过程有所差异;初应力系数的变化对轴压短柱承载力影响较小,但对偏压柱受力性能有一定影响,随着初应力系数的增大其承载力下降;试验参数范围内,偏心率对柱承载力的影响明显大于初应力系数的影响。基于试验结果对有限元模型的可靠性进行验证,在模型验证基础上,分析钢管初应力对钢管与混凝土之间的相互作用和各部件承载力分配的影响,并进一步分析不同参数(如长细比、偏心率、型钢截面尺寸等)对柱承载力影响系数的影响。结果表明,钢管初应力系数、偏心率和长细比对柱承载力影响系数影响显著,基于此提出考虑钢管初应力时内配型钢钢管混凝土柱受压承载力计算方法,其计算结果与试验和数值结果吻合较好。To study the influence of the preload effect on the later mechanical performance of steel-reinforced concrete-filled circular steel tubular(SRCFST) members, an experimental study on 12 circular SRCFST columns subjected to compressive loads was completed. Main testing parameters were the preload ratios and load eccentric ratios. The deformation process, failure mode, and the influences of different parameters on the load-deformation curves and mechanical performance of the members were obtained through the test. The testing results show that different preload ratios and load eccentric ratios have a slight effect on the failure mode of specimens, however, the specimens exhibit distinct failure processes due to the varying slenderness ratios. The change of preload ratios has little effect on the ultimate bearing capacity of axially loaded stub columns but has a certain effect on the mechanical performances of eccentrically loaded specimens. With the increase of the preload ratio, the ultimate capacity of the specimen under eccentric compression decreases, the influence of eccentricity on the bearing capacity of specimens within the range of test parameters is significantly greater than that of the preload ratio. Based on the test results, the reliability of the finite element(FE) model was validated. Through the validated FE model, the interaction between steel tube and concrete, and the distribution of bearing capacity of each component were discussed, as well as the influence of various parameters(i.e., slenderness ratio, load eccentricity ratio, cross-section size of profiled steel) on the influential coefficient of bearing capacity was further analyzed. The results show that the preload ratio, eccentricity and slenderness ratio have significant effects on the influential coefficient of bearing capacity. Finally, the calculation method for compressive capacity of SRCFST members considering the preload on steel tube was proposed, and the calculated results are in good agreement with the experimental and numerical

关 键 词：内配型钢钢管混凝土 初应力 静力试验 有限元分析 破坏形态 承载力 

分 类 号：TU398.9[建筑科学—结构工程]