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Experimental study on long-term behavior of RC columns subjected to sustained eccentric load

机译：偏心荷载作用下钢筋混凝土柱长期性能的试验研究

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摘要

To investigate the long-term behavior of eccentrically loaded RC columns, which are more realistic in practice than concentrically loaded RC columns, long-term eccentric loading tests were conducted for 10 RC columns. Test parameters included concrete compressive strength, reinforcement ratio, bar yield strength, eccentricity ratio, slenderness ratio, and loading pattern. Test results showed that the strain and curvature of the columns increased with time, and concrete forces were gradually transferred to longitudinal bars due to the creep and shrinkage of concrete. The long-term behavior of the columns varied with the test parameters, and long-term effects were more pronounced in the case of using the lower strength concrete, lower strength steel, lower bar ratio, fewer loading-step, higher eccentricity ratio, and higher slenderness ratio. However, in all the columns, no longitudinal bars were yielded under service loads at the final measuring day. Meanwhile, the numerical analysis modeling using the ultimate creep coefficient and ultimate shrinkage strain measured from cylinder tests gave quite good predictions for the behavior of the columns.
机译：为了研究偏心加载的RC柱的长期性能（在实践中比同心加载的RC柱更现实），对10根RC柱进行了长期偏心载荷测试。测试参数包括混凝土的抗压强度，增强比，钢筋屈服强度，偏心率，细长率和加载方式。试验结果表明，柱的应变和曲率随时间增加，由于混凝土的蠕变和收缩，混凝土力逐渐转移到纵向钢筋上。柱的长期性能随测试参数而变化，并且在使用较低强度的混凝土，较低强度的钢，较低的钢筋比率，较少的加载步骤，较高的偏心率和较低的混凝土的情况下，长期影响更加明显。细长率更高。但是，在所有列中，最后一个测量日在使用载荷下均没有屈服的纵向钢筋。同时，使用圆柱试验测得的极限蠕变系数和极限收缩应变的数值分析模型对圆柱的性能给出了很好的预测。

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