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Cyclic behavior of steel tube-reinforced high-strength concrete composite columns with high-strength steel bars

机译：高强度钢筋钢管增强高强度混凝土复合柱的循环行为

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摘要

To study the cyclic behavior of steel tube-reinforced, high-strength concrete columns with high-strength steel bars, a cyclic loading test of six full-sized square columns was carried out, including one traditional reinforced concrete (RC) column and five steel tube-reinforced concrete (STRC) composite columns. The cross-sectional shape of the inner steel tube, the strength matching of the outer concrete and the core concrete, and the presence of steel fiber in outer concrete were the major parameters of the test. The research shows that steel fiber-reinforced high-strength STRC composite columns had better seismic behavior compared to RC columns. The strength matching method, where the C90 core concrete was combined with the C70 outer concrete, resulted in a better composite effect in comparison to the method of using C80 concrete in both core concrete and outer concrete. Moreover, the addition of steel fibers in outer concrete effectively reduced the damage degree and improved the ductility, resilient capacity, and energy dissipation capacity of the specimens. Finally, based on the test research and theoretical analysis, a calculation model for predicting the maximum load-carrying capacity was proposed. The model was then verified by comparing its predictions with test results.
机译：为研究具有高强度钢筋的钢管增强，高强度混凝土柱的循环行为，进行了六个全尺寸方柱的循环负载试验，包括一种传统的钢筋混凝土（RC）柱和五钢管钢混凝土（Strc）复合柱。内钢管的横截面形状，外部混凝土和芯混凝土的强度匹配，以及外部混凝土中的钢纤维的存在是测试的主要参数。该研究表明，与RC柱相比，钢纤维增强的高强度Strc复合柱具有更好的地震性能。 C90芯混凝土与C70外混凝土结合的强度匹配方法，与在核心混凝土和外混凝土中使用C80混凝土的方法相比，更好的复合效果。此外，在外混凝土中加入钢纤维有效地降低了标本的延展性，延展性，弹性容量和能量耗散能力。最后，基于测试研究和理论分析，提出了一种预测最大载荷能力的计算模型。然后通过将其预测与测试结果进行比较来验证该模型。

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