Closure of "Strength Decay of RC Columns under Shear Reversals"
Closure of "Strength Decay of RC Columns under Shear Reversals"
复制标题
“剪切反转下 RC 柱的强度衰减”的结束
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
M. Sozen
中科院分区：
文献类型：
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作者：
J. Wight;M. Sozen
为了研究地震荷载作用下钢筋混凝土系杆柱抗剪强度的衰减规律，对12根柱试件进行了几次大于屈服挠度的反向加载试验。试验程序的主要变量是轴向荷载、横向配筋率和每周总挠度。试验试件能够在第一个四分之一循环中产生预期的屈服弯矩，并在一定的非弹性挠度内保持该载荷。然而，这些挠度的重复导致构件强度的衰退。利用试验数据分析了壳体混凝土的破坏剥落、横向钢筋的屈服以及混凝土沿斜裂缝的磨擦等强度衰减机理。研究结果表明，横向配筋的比例必须达到发展柱的极限弯矩能力所需的总剪力。
The decay in shear strength of tied reinforced concrete columns during earthquake loading was investigated by subjecting 12 column specimens to several reversals of loading to deflections larger than the yield deflection. The principal variables of the test program were the axial load, the transverse reinforcement ratio, and the total deflection per cycle. The test specimens were able to develop the expected yield moment in the first quarter cycle and maintain that load for some inelastic deflection. However, the repetition of these deflections resulted in a decay in the strength of the member. Experimental data are used to examine the mechanism of strength decay, which is related to crushing and spalling of the shell concrete, yielding of the transverse reinforcement, and abrasive rubbing of concrete along inclined cracks. The results of this investigation indicate that the transverse reinforcement must be proportioned to carry the total shear required to develop the ultimate moment capacity of the column.