Cyclic performance of repaired concrete-filled steel tubular columns after exposure to fire
Cyclic performance of repaired concrete-filled steel tubular columns after exposure to fire
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DOI：
10.1016/j.tws.2006.10.001
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发表时间：
2006-10
影响因子：
6.4
通讯作者：
Lin-Hai Han;Xiao-Kang Lin;Yong C. Wang
中科院分区：
文献类型：
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作者：
Lin-Hai Han;Xiao-Kang Lin;Yong C. Wang
通过对火灾后钢管混凝土柱进行加固处理的试验研究，获得了火灾后钢管混凝土柱的低周反复荷载试验数据。试验参数包括横截面类型（圆形、方形和矩形）和轴向载荷水平（0、0.3、0.6）。结果发现，所有的测试样本表现出韧性的方式和测试进行顺利和控制的方式。在试验的基础上，对两种柱的极限抗侧承载力、抗弯刚度、耗能能力和延性进行了分析比较。试验结果表明，火灾后，空心混凝土柱的极限抗侧承载力和抗弯刚度均有所下降，但延性并未受到影响。试验结果还表明，受火后试件的强度和刚度可以恢复到原试件的水平。
This paper provides new test data of cyclic behavior of repaired concrete-filled steel tubular (CFST) columns after exposure to fire, the fire-damaged CFST columns being strengthened by wrapping the original columns by concrete and a thin-walled steel tube. The test parameters included the cross-section type (circular, square and rectangular), and the axial load level (0, 0.3, 0.6). It was found that all the test specimens behaved in a ductile manner and testing proceeded in a smooth and controlled way. Based on the experiment measurements, the ultimate lateral strength, flexural stiffness, dissipated energy and ductility of the columns are analyzed and compared. The test results indicate that the ultimate lateral strength and flexural stiffness of concrete-filled hollow structural columns decrease after exposure to fire, however, the ductility of the columns was not adversely affected due to the fire exposure. The test results also indicate that the strength and stiffness of the fire-damaged columns can be restored over the original level of the specimens.