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Seismic evaluation of the shear behavior in reinforced concrete bridge columns including effect of vertical accelerations

机译：钢筋混凝土桥梁柱抗剪性能的地震评估，包括垂直加速度的影响

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The effect of vertical excitation on shear capacity of reinforced concrete columns is important. Field evidences, analytical studies and static or hybrid simulations suggested that excessive tension or tensile strain of the column may lead to shear strength degradation, and therefore vertical excitation can be one of the causes of shear failure. This paper describes an experimental study consisting of shaking table tests on reduced-scale bridge columns. Results of the tests indicate that tension in the columns has the potential to degrade the shear capacity, which is mainly due to the degradation of the concrete contribution to this capacity. The presented computational results and code evaluations also support this shear strength degradation. The presented dynamic tests contribute to better understanding of the effect of vertical excitation on the shear failure, which is one of the most critical brittle failure mechanisms.
机译：竖向激励对钢筋混凝土柱的抗剪承载力的影响很重要。现场证据，分析研究以及静态或混合模拟表明，柱的过大拉伸或拉伸应变可能导致剪切强度降低，因此垂直激励可能是剪切破坏的原因之一。本文介绍了一项实验研究，包括在缩小规模的桥梁柱上进行振动台试验。测试结果表明，柱中的张力可能会降低剪切能力，这主要是由于混凝土对此能力的贡献降低了。给出的计算结果和规范评估也支持这种抗剪强度的下降。提出的动态测试有助于更好地理解垂直激励对剪切破坏的影响，这是最关键的脆性破坏机制之一。

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