Eccentric strength and design of RC columns strengthened with SCC filled steel tubes
Eccentric strength and design of RC columns strengthened with SCC filled steel tubes
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DOI：
10.12989/scs.2015.18.4.833
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发表时间：
2015-04
影响因子：
4.6
通讯作者：
Na Li;Yiyan Lu;Hongjun Liang;Shan Li
中科院分区：
文献类型：
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作者：
Na Li;Yiyan Lu;Hongjun Liang;Shan Li
自密实钢管混凝土结合了钢材和混凝土材料的优点，可用于加固钢筋混凝土柱。为了研究加固柱的偏心受压性能，本文对其进行了试验和数值模拟研究。试验结果表明，SCFT的使用是有趣的，因为钢筋混凝土柱的延性和承载力大大提高。柱截面形式（圆形和方形）、钢管壁厚、加固混凝土设计强度等级和初始偏心距4个参数对加固柱的性能有显著影响。在数值计算程序中，建立了一个考虑约束效应的通用纤维单元模型，用于预测偏心受压加固柱的受力性能。通过与试验结果的对比，验证了纤维单元分析的正确性，并提出了一个简单的偏心受压极限承载力计算公式。计算结果与试验结果的对比表明，设计公式对偏心受压加固柱极限承载力的估算值接近5%。
Self-compacting Concrete Filled steel Tubes (SCFT), which combines the advantages of steel and concrete materials, can be applied to strengthen the RC columns. In order to investigate the eccentric loading behavior of the strengthened columns, this paper presents an experimental and numerical investigation on them. The experimental results showed that the use of SCFT is interesting since the ductility and the bearing capacity of the RC columns are greatly improved. And the performance of strengthened columns is significantly affected by four parameters: column section type (circular and square), wall thickness of the steel tube, designed strength grade of strengthening concrete and initial eccentricity. In the numerical program, a generic fiber element model which takes in account the effect of confinement is developed to predict the behavior of the strengthened columns subjected to eccentric loading. After the fiber element analysis was verified against experimental results, a simple design formula based on the model is proposed to calculate the ultimate eccentric strength. Calibration of the calculated results against the test results shows that the design formula closely estimates the ultimate capacities of the eccentrically compressed strengthened columns by 5%.