组合方柱轴压承载力简化计算方法  

Calculation methods of bearing capacity for composite square columns under axial compression

作　　者：高丹盈[1,2] 王代[1,3] 

机构地区：[1]郑州大学新型建材与结构研究中心,郑州450002 [2]河南工程学院,郑州451191 [3]郑州工程技术学院土木工程学院,郑州450044

出　　处：《水力发电学报》2017年第4期104-111,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(50579068);郑州市科技攻关项目(112PPTGY251-6)

摘　　要：为了促进FRP-混凝土-钢管组合方柱在水利工程中的应用,本文根据13根组合方柱的轴压试验,分析了空心率、钢管径厚比和FRP布层数等对其轴压承载力的影响,建立了组合方柱轴压承载力的简化计算模型;基于该模型并结合对本文和相关文献试验结果的统计分析,提出了考虑FRP约束程度、空心率和钢管径厚比影响的组合方柱轴压承载力计算公式。研究结果表明:由于外层FRP管和内层钢管对夹层混凝土有较大约束,组合方柱轴压承载力得到显著提高;外层FRP管约束程度和内钢管径厚比对组合方柱轴压承载力有较大影响;当钢管径厚比接近时,组合方柱轴向承载力随空心率的增大而增大;组合方柱轴压承载力计算公式的计算值与试验值符合较好。This paper presents an analysis of bearing capacity of FRP-concrete-steel tube composite square columns based on axial compression tests, focusing on the influences of hollow ratio, diameter-tothickness ratio of inner steel tube, the number of FRP layers wrapped on the columns, etc. to promote their application in hydraulic structures. Based on our test data and previously reported data, we have derived calculation formulas and a corresponding model for simplified calculation of the bearing capacity varying with these three major factors. The results show that the bearing capacity of this composite structure is significantly improved due to its sandwich concrete that is highly confined by its inner steel tube and outer FRP tube. Under axial compression, the most significant factors are the confining degree of the FRP tube and the diameter-to-thickness ratio, and the bearing capacity increases with hollow ratio when the diameter-to-thickness ratio is kept nearly constant. The calculations of the formulas agree well with the results of axial compression tests.

关 键 词：水工结构 组合方柱 极限承载力 计算方法 轴压试验 

分 类 号：TV332.11[水利工程—水工结构工程]