内填料石钢管混凝土短柱轴压性能研究及承载力计算  

Experimental study on axial load carrying performance and design method of stone prism and concrete-filled steel tubular stub columns

作　　者：谢菁 刘阳[1,2] 叶勇[1,2] 吴雯雯 明皓 XIE Jing;LIU Yang;YE Yong;WU Wenwen;MING Hao(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]华侨大学福建省结构工程与防灾重点实验室,福建厦门361021

出　　处：《建筑结构学报》2022年第6期43-52,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51878304,51808234);福建省自然科学基金项目(2020J06020,2021J01286)。

摘　　要：为合理重复利用废弃石材,将抗压强度高、脆性强的石材置于钢管混凝土柱(CFST)中部,利用钢管的约束充分发挥石材的抗压强度并延缓其压溃,形成内填料石钢管混凝土(SCFST)柱。为研究SCFST短柱的轴压受力机理,采用通用有限元软件ABAQUS建立SCFST短柱精细化3D有限元模型,并利用已经完成的18根SCFST短柱和6根传统钢管混凝短柱试件的破坏形态和荷载-变形关系试验结果对模型的可靠性进行验证。通过验证后的有限元模型,分析SCFST短柱各部件之间的相互作用及荷载分配规律。在此基础上,进一步开展系统的参数分析,研究内填料石尺寸、钢管壁厚、钢管屈服强度和混凝土强度等参数对SCFST柱轴压性能的影响规律。研究结果表明,不同部件间的相互作用随钢管壁增厚和混凝土强度提高而增大,受内填石料尺寸的影响较小。提出了适用于SCFST短柱的轴压承载力计算式,在研究参数范围内计算式具有较好的计算精度。To reasonably reuse the discarded stone material, the stone with high compressive strength and brittleness was positioned in the middle of the concrete-filled steel tube(CFST) column, whose confinement could make the most of the compressive strength of stone and postpone its crushing. Therefore, the stone prism and concrete-filled steel tubular(SCFST) stub column was proposed. An elaborate three-dimensional finite element analysis(FEA) model was established to further study the load-carrying mechanism of circular SCFST columns by adopting software ABAQUS. The reliability of the FEA model was evaluated by comparing to the failure modes and load-displacement relationships of 18 SCFST column and six CFST column test specimens subjected to axial compression loads. Based on the validated FEA model, the interactions and force distribution between different components were investigated. The influence of major parameters on the axial compression performance of SCFST columns were investigated, including the size of the infilled stone prism, the wall thickness of steel tube, the yield stress of carbon steel), and concrete strength. Results show that the interaction between components increases with the increase of the wall thickness of steel tube or the concrete strength, while the infilled stone prism has a minor effect. Finally, a simplified design model was proposed to calculate the ultimate capacity of circular SCFST columns, and the predicted values generally agree well with the experimental results within the scope of considered parameters.

关 键 词：内填料石钢管混凝土 短柱 有限元分析 相互作用 荷载分配 轴压承载力 

分 类 号：TU398[建筑科学—结构工程] TU311.41