Seismic performance of high strength reinforced concrete columns
Seismic performance of high strength reinforced concrete columns
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DOI：
10.12989/sem.2009.31.6.697
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发表时间：
2009-04
影响因子：
2.2
通讯作者：
H. Bechtoula;S. Kono;F. Watanabe
中科院分区：
文献类型：
--
作者：
H. Bechtoula;S. Kono;F. Watanabe
本文对高强钢筋混凝土柱在低周反复荷载作用下的抗震性能进行了试验研究和理论分析。对六根不同尺寸和混凝土抗压强度的悬臂柱进行了试验。三列，小尺寸，有一个毫米的横截面和其他三列，中等尺寸，毫米。混凝土抗压强度为80，130和180 MPa。所有样本均按照日本设计指南进行设计。试验结果表明，对于混凝土抗压强度为180 MPa的试件，保护层混凝土的剥落非常脆，随后强度显著降低。曲率对于小尺寸的柱比对于中等尺寸的柱更重要。混凝土抗压强度对曲率分布没有影响，位移在-2%和+2%之间变化。然而，它对峰值力矩对应的漂移和等效粘性阻尼变化有影响。提出了简单的方程：1）评估混凝土的杨氏模量为高强度混凝土和2）评估的力矩漂移包络线为中等尺寸的列知道的小尺寸列。实验的力矩漂移和轴向应变漂移的历史，以及预测使用的纤维模型由作者开发的。
This paper summarizes an experimental and analytical study on the seismic behavior of high strength reinforced concrete columns under cyclic loading. In total six cantilever columns with different sizes and concrete compressive strengths were tested. Three columns, small size, had a mm cross section and the three other columns, medium size, were mm. Concrete compressive strength was 80, 130 and 180 MPa. All specimens were designed in accordance with the Japanese design guidelines. The tests demonstrated that, for specimens made of 180 MPa concrete compressive strength, spalling of cover concrete was very brittle followed by a significant decrease in strength. Curvature was much important for the small size than for the medium size columns. Concrete compressive strength had no effect on the curvature distribution for a drift varying between -2% and +2%. However, it had an effect on the drift corresponding to the peak moment and on the equivalent viscous damping variation. Simple equations are proposed for 1) evaluating the concrete Young`s modulus for high strength concrete and for 2) evaluating the moment-drift envelope curves for the medium size columns knowing that of the small size columns. Experimental moment-drift and axial strain-drift histories were well predicted using a fiber model developed by the authors.