Cumulative Cyclic Deformation Capacity of Circular Tubular Braces under Local Buckling
Cumulative Cyclic Deformation Capacity of Circular Tubular Braces under Local Buckling
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DOI：
10.1061/(asce)st.1943-541x.0000380
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发表时间：
2011-11
期刊：
影响因子：
--
通讯作者：
T. Takeuchi;R. Matsui
中科院分区：
文献类型：
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作者：
T. Takeuchi;R. Matsui
管形截面构件通常用作抗震支撑，因为它们比同等面积的开口截面具有更高的惯性矩。但是，由于破坏是由圆管局部屈曲引起的，屈曲后圆管截面的累积循环变形能力小于开口截面，如H形截面。为了评估这种斜撑的抗震性能，有必要预测这些斜撑在任何断裂之前的累积循环变形能力。在这项研究中，累积循环变形能力下的局部屈曲的圆管支撑进行评估循环加载试验的范围内的细长和直径厚度比。在各种分析中研究了管状支撑中应变集中的机理，提出了基于支撑整体轴向变形来评估支撑断裂前累积变形能力的方法。
Tubular-section members are commonly used as seismic-resistant braces because they have a higher moment of inertia than open cross sections of equivalent area. However, the cumulative cyclic deformation capacity of tubular sections after buckling is smaller than that of open sections, such as H-shaped sections, because fracture is initiated by local buckling of circular tubular sections. To evaluate the seismic performance of such diagonal braces, it is essential to predict the cumulative cyclic deformation capacity of these braces before any fracturing. In this study, the cumulative cyclic deformation capacity of circular tube braces under local buckling was assessed by performing cyclic loading tests for a range of slenderness and diameter-to-thickness ratios. The mechanism of strain concentration in the tubular braces was studied in various types of analysis, and a method is proposed for assessing the cumulative deformation capacity before fracture based on the entire axial deformation of the braces.