VOID-FILLED SHS BEAMS SUBJECTED TO LARGE DEFORMATION CYCLIC BENDING
VOID-FILLED SHS BEAMS SUBJECTED TO LARGE DEFORMATION CYCLIC BENDING
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DOI：
10.1061/(asce)0733-9445(1999)125:9(1020
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发表时间：
1999-09
期刊：
影响因子：
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通讯作者：
X. Zhao;R. Grzebieta
中科院分区：
文献类型：
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作者：
X. Zhao;R. Grzebieta
在地震引起的高振幅循环弯曲下，方形空心截面梁的受压翼缘可能会出现局部屈曲和塑性铰。一旦形成局部机制，残余强度会在几个循环内迅速降低。对于在静态弯曲下具有足够旋转能力的紧凑型材来说也是如此。本文比较了空心和空隙填充的冷弯方形空心型材在大变形循环弯曲下的性能。开发了一个模型来估计空隙填充 SHS 梁的极限力矩能力。所用填充材料为普通混凝土、低强混凝土、轻质混凝土和聚氨酯。实验结果表明，空隙填充显着增加了延展性，从而增加了 SHS 梁在过载情况下可以承受的弯曲循环次数。
Local buckling and plastic hinges may occur in the compression flange of square hollow-section (SHS) beams under high amplitude cyclic bending arising from earthquakes. Once a local mechanism forms, residual strength rapidly reduces within a few cycles. This is even true for compact sections that have adequate rotation capacity under static bending. This paper compares the behavior of empty, and void-filled, cold-formed square hollow sections subjected to large deformation cyclic bending. A model is developed to estimate the ultimate moment capacity of void-filled SHS beams. The filler material used was normal concrete, low strength concrete, lightweight concrete and polyurethane. Experimental results show that void filling significantly increases ductility—and thus the number of bending cycles SHS beams can be subjected to—in overloaded situations.