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Damage evolution in reinforced concrete columns subjected to biaxial loading

机译:钢筋混凝土柱在双轴荷载下的损伤演化

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摘要

An analysis of the damage observed in 24 reinforced concrete (RC) columns tested under uniaxial and biaxial horizontal loading is presented. The test results show that for biaxial loading conditions specific damage occurs for lower drift demands when compared with the corresponding uniaxial demand (a reduction of 50-75 % was found). The damage distribution observed in each column is also analysed. No significant differences are found in the plastic hinge length for uniaxial and biaxial loading. The drift demands associated with each damage state are compared with reference values proposed in international guidelines. Finally, and based on the philosophy of the Park and Ang uniaxial damage index, two new expressions are proposed for the evaluation of damage in RC elements under biaxial loading. The results of the application of these expressions to the experimental results are discussed.
机译:给出了在单轴和双轴水平荷载下测试的24根钢筋混凝土(RC)柱中观察到的损伤的分析。测试结果表明,在双轴加载条件下,与相应的单轴需求相比,较低的漂移需求会产生特定的损坏(减少了50-75%)。还分析了在每列中观察到的损伤分布。对于单轴和双轴载荷,塑料铰链长度没有发现显着差异。将与每种损坏状态相关的漂移要求与国际准则中提出的参考值进行比较。最后,根据Park和Ang单轴损伤指数的原理,提出了两个新的表达式来评估双轴载荷下RC元件的损伤。讨论了将这些表达式应用于实验结果的结果。

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