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首页> 外文期刊>Bulletin of earthquake engineering >Effects of strain gradients in the onset of global buckling in slender walls due to earthquake loading
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Effects of strain gradients in the onset of global buckling in slender walls due to earthquake loading

机译：由于地震载荷引起的纤细壁上全球弯曲发作中应变梯度的影响

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摘要

Global buckling of slender walls, reported only in a few laboratory tests before 2010, became a critical issue in design of reinforced concrete buildings after it was observed following the 2010 Mw 8.8 Chile earthquake and the 2011 Mw 6.3 New Zealand earthquake. Researchers have proposed theoretical buckling models based on prismatic columns subjected to uniform tension/compression cycles, where the key parameters are slenderness ratio, number of curtains of reinforcement, and maximum tensile strain before buckling during load reversal. These models have shown sufficient accuracy in comparison with laboratory tests on columns under such loading conditions. However, buckling in walls is more complex because of variation of strains through the wall depth and variation of moment along the wall height. Nonlinear finite elements are used to evaluate the effects of these more complex loadings on buckling of wall boundary elements. Analyses showed that the maximum tensile strain (averaged over the wall out-of-plane unsupported height) required to buckle the wall during load reversal does not depend on the moment variation along the wall height. Moreover, for typical wall lengths, the wall boundary behaves like an isolated column subjected to axial force cycles, with minimal apparent bracing provided by the wall web. This allows to analyze a broad range of practical cases for buckling susceptibility using simplified approaches based on buckling models of axially loaded columns.
机译：全球屈曲围墙仅在2010年之前的几个实验室测试中报告，在2010 MW 8.8智利地震和2011年MW 6.3新西兰地震之后，在观察到钢筋混凝土建筑物的设计中成为一个关键问题。研究人员提出了基于经受均匀张力/压缩循环的棱柱柱的理论屈曲模型，其中关键参数是纤细的比例，加固窗帘的窗帘和屈曲期间屈曲前的最大拉伸应变。与在这种装载条件下的柱上的实验室测试相比，这些模型表现出足够的准确性。然而，由于通过墙体深度和沿壁高的时刻变化，围墙中的弯曲更复杂。非线性有限元件用于评估这些更复杂的载荷对壁边界元件屈曲的影响。分析表明，在负载反转期间弯曲墙壁所需的最大拉伸应变（平均在平面外不浮出的高度）不依赖于沿壁高的瞬间变化。此外，对于典型的壁长度，壁边界的表现类似于经受轴向力循环的隔离柱，由壁纸提供最小的表观支撑。这允许使用基于轴向加载的柱的屈曲模型的简化方法来分析广泛的实际情况。

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