FRP管—混凝土—钢管组合柱承载力的试验研究

发布时间：2018-07-28 07:27

【摘要】：FRP复合材料由于其轻质高强、耐腐蚀等一系列特点,近二十年来引起了各国学者的广泛关注。FRP管-混凝土-钢管组合柱(FRP-Concrete-Steel Double-Skin Tubular Colum,简称DSTC)是一种有效利用复合材料特点的新型组合构件形式,FRP、混凝土和钢管三种材料的协同互补和共同工作使该组合柱具有许多优于现有组合构件的力学性能。本文对DSTC短柱轴压性能和长柱偏压性能进行了试验研究,对短柱轴压承载力和长柱偏压承载力计算公式进行了探讨。论文首先设计并实施DSTC短柱的轴心受压试验和长柱的偏心受压试验,研究参数包含荷载偏心距、FRP壁厚以及混凝土截面空心率。详细阐述了试件的制作过程以及GFRP管、无缝钢管和自密实混凝土的材料性能试验。然后对DSTC中FRP管、混凝土和钢管在轴压和偏压下的试验现象、破坏模式以及受力性能进行分析,讨论了荷载偏心距、FRP管壁厚以及混凝土截面空心率对DSTC短柱轴压和长柱偏压极限承载力和延性的影响,分析了长柱偏压下截面的轴向应变分布等。论文接着基于现有的试验现象和结论,提出合理的假设,根据已有的计算形式简洁精度较高的DSTC约束混凝土应力-应变模型,提出DSTC短柱轴压下极限承载力的计算公式,通过与试验结果进行对比验证其计算精度。结果显示,计算值与试验值吻合良好。最后,以本文DSTC长柱偏压下的试验数据为依据,对已有长柱偏压下的极限承载力计算公式的准确性进行了验证,结果显示,公式具有较好的精度,且大多偏于保守。
[Abstract]:Because of its light and high strength, corrosion resistance and other characteristics of FRP composite, FRP-Concrete-Steel Double-Skin Tubular column (DSTC) is a new type of composite member, which can effectively utilize the characteristics of composite materials, such as FRP, concrete and steel tube. Cooperative complementation and joint work make the composite column have many better mechanical properties than the existing composite members. In this paper, the axial compression capacity of DSTC short columns and the biasing capacity of long columns are experimentally studied, and the formulas for calculating axial compression capacity and eccentric bearing capacity of long columns are discussed. In this paper, the axial compression test of DSTC short column and eccentric compression test of long column are designed and carried out. The research parameters include load eccentricity and wall thickness of DSTC and hollow heart rate of concrete section. The fabrication process of the specimen and the material performance tests of GFRP tube, seamless steel tube and self-compacting concrete are described in detail. Then, the experimental phenomena, failure modes and mechanical properties of FRP pipe, concrete pipe and steel pipe under axial and eccentric compression in DSTC are analyzed. The effects of eccentric load on the ultimate bearing capacity and ductility of DSTC short columns and long columns are discussed. The axial strain distribution of long columns under eccentric compression is analyzed. Then, based on the existing experimental phenomena and conclusions, a reasonable assumption is put forward. According to the existing stress-strain model of DSTC confined concrete with simple and accurate calculation form, the formula for calculating ultimate bearing capacity of DSTC short columns under axial compression is put forward. The calculation accuracy is verified by comparing with the experimental results. The results show that the calculated values are in good agreement with the experimental values. Finally, based on the experimental data of DSTC columns under bias, the accuracy of the existing formulas for calculating the ultimate bearing capacity of long columns under bias pressure is verified. The results show that the formulas have good accuracy and tend to be conservative.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9;TU312

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