组合方柱轴压承载力简化计算方法

发布时间：2018-08-25 20:40

【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。
[Abstract]:In order to promote the application of FRP- concrete-steel tube composite square column in hydraulic engineering, the effects of empty heart rate, diameter to thickness ratio of steel pipe and FRP layer number on the axial compression capacity of 13 composite square columns are analyzed in this paper. A simplified calculation model of axial compression capacity of composite square columns is established, and based on this model and statistical analysis of the experimental results in this paper and related literature, the degree of constraint of FRP is proposed. Calculation formula of axial bearing capacity of composite square column influenced by hollow ratio and diameter to thickness ratio of steel pipe. The results show that the axial compressive capacity of composite square columns is significantly improved due to the large constraint of outer FRP pipe and inner steel tube to sandwich concrete, the degree of restraint of outer FRP pipe and the ratio of diameter to thickness of inner steel tube have great influence on axial compression capacity of composite square column. When the ratio of diameter to thickness of steel pipe is close, the axial bearing capacity of composite square column increases with the increase of hollow ratio, and the calculated value of axial compression bearing capacity of composite square column is in good agreement with the experimental value.
【作者单位】：郑州大学新型建材与结构研究中心;河南工程学院;郑州工程技术学院土木工程学院;
【基金】：国家自然科学基金(50579068) 郑州市科技攻关项目(112PPTGY251-6)
【分类号】：TV314

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