| 钢套管再生混凝土加固柱轴压试验 |
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| 引用本文： | 何岸,蔡健,陈庆军,薛华,左志亮,汤序霖,黎凯宇.钢套管再生混凝土加固柱轴压试验[J].西南交通大学学报,2018,53(6):1187-1194, 1204. |
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| 作者姓名： | 何岸 蔡健 陈庆军 薛华 左志亮 汤序霖 黎凯宇 |
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| 摘 要： | 为实现建筑业节能减排的目标，提出了钢套管再生混凝土加固柱的新加固方法，对1个未加固柱、12个钢套管再生混凝土加固柱以及2个钢管混凝土柱进行轴压试验，并对试件的承载力和变形特点进行分析，并讨论了该加固柱的承载力计算方法.研究结果表明:加固后试件的承载力提高2.19～3.98倍，且加固柱的刚度、延性均比原柱有明显提高；钢套管再生混凝土加固柱的承载力为钢套管普通混凝土加固柱承载力的91.8%～97.0%；当填充再生混凝土强度由27.0 MPa增加到32.9 MPa时，加固柱的承载力仅提高2.67%；对于再生粗骨料取代率为50%的试件，当钢套管厚度由1.81 mm增加到3.84 mm和5.84 mm时，承载力分别提高了34.0%和77.8%；考虑原柱初始应力后，试件峰值应变减小47.1%～59.3%；钢套管加固柱与钢管混凝土柱具有类似的受力性能.采用不同规范计算试件的承载力，结果表明EC4规范公式的计算精度最高，稳定性最佳.
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| 关 键 词： | 钢套管 再生混凝土 加固 轴压试验 初始应力 |
| 收稿时间： | 2016-05-20 |
Axial Compressive Experiment on Steel-Jacket Retrofitted Column with Recycled Aggregate Concrete |
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| HE An,CAI Jian,CHEN Qingjun,XUE Hua,ZUO Zhiliang,TANG Xulin,LI Kaiyu.Axial Compressive Experiment on Steel-Jacket Retrofitted Column with Recycled Aggregate Concrete[J].Journal of Southwest Jiaotong University,2018,53(6):1187-1194, 1204. |
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| Authors: | HE An CAI Jian CHEN Qingjun XUE Hua ZUO Zhiliang TANG Xulin LI Kaiyu |
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| Abstract: | To realise the goals of energy saving and emissions reduction in the construction industry, a new retrofitting method of steel-jacket retrofitted columns with recycled aggregate concrete is presented. An unstrengthened column, twelve steel-jacket retrofitted columns, and two concrete-filled steel-tube columns were tested under concentric compressive loading. The axial resistance and deformation capacity were analysed, and the method for calculating the strength of the retrofitted column was evaluated. The experimental results indicated that the strength of the retrofitted columns is 2.19–3.98 times higher than that of the unstrengthened one. In addition, the stiffness and ductility of the steel-jacketed columns increased notably. The strengths of the retrofitted columns with recycled aggregate concrete were 91.8%–97.0% of that of the column with normal infill concrete. As the strength of the infill recycled concrete increased from 27.0 MPa to 32.9 MPa, the strength of the retrofitted column increased by only 2.67%. For specimens with the replacement ratio of recycled coarse aggregate of 50%, the strength of the retrofitted column was enhanced by 34.0% and 77.8% as the thickness of the steel jacket increased from 1.81 mm to 3.84 mm and to 5.84 mm, respectively. After considering the preload of the original column, the strains corresponding to the peak load of the retrofitted column decreased by 47.1%–59.3%. The performance of the steel-jacket retrofitted column was similar to that of the concrete-filled steel-tube columns. Various methods from current design codes were adopted to calculate the axial resistance of the steel-jacket retrofitted column and it was seen that the design code EC4 provides the most accurate and stable predictions. |
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