The behavior of reinforced concrete columns subjected to axial force and biaxial bending
The behavior of reinforced concrete columns subjected to axial force and biaxial bending
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DOI：
10.1016/s0141-0296(99)00090-5
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发表时间：
2000-11-01
影响因子：
5.5
通讯作者：
Lee, SS
中科院分区：
文献类型：
--
作者：
Kim, JK;Lee, SS
当钢筋混凝土双向受弯构件的应力超过弹性极限或出现裂缝时，轴力和长、短主轴弯矩都会影响总截面各主轴的曲率。本文提出了一种考虑曲率局部化的钢筋混凝土轴压双向压弯构件的数值计算方法。为了验证所提出的数值方法，还进行了一系列的休息，我们的16个系钢筋混凝土柱100 × 100毫米平方和200 × 100毫米的矩形截面在各种荷载条件下。柱两端的边界条件为铰接，偏心距（40 mm）相等且方向相同。偏心距方向与截面长主轴的夹角分别为0 °、30 °、45 °和0 °、30 °、45 °、60 °、90 °时，方形截面的极限荷载、轴力-侧移关系、和横向偏转轨迹。在有限的研究中，还发现ACI的弯矩放大系数法在单轴和双轴偏心荷载条件下都是保守的。(C)2000爱思唯尔科技有限公司版权所有。
When stress is beyond elastic limit or cracking occurs in a reinforced concrete member subjected to axial force and biaxial bending, curvature about each principal axis of gross section may be influenced by axial force and bending moments about both major and minor principal axes. It is mainly due to the translation and rotation of principal axes of the cross section after cracking.In this study, a numerical method for predicting the behavior of reinforced concrete columns subjected to axial force and biaxial bending is proposed considering curvature localization. To verify the proposed numerical method, a series of rests was also carried our for 16 tied reinforced concrete columns with 100x100 mm square and 200x100 mm rectangular sections under various loading conditions. The boundary conditions at both ends of the column were hinged and eccentricities (40 mm) were equal and of the same directions. The angles between the direction of eccentricity and the major principal axis of gross section were 0 degrees, 30 degrees, 45 degrees for the square section and 0 degrees, 30 degrees, 45 degrees, 60 degrees, 90 degrees for the rectangular section.A comparison between the numerical predictions and the test results shows good agreements in ultimate loads, axial force-lateral deflection relations, and lateral deflection trajectories. It is also found, in this limited investigation, that ACI's moment magnifier method is conservative in both uniaxial and biaxial eccentric loading conditions. (C) 2000 Elsevier Science Ltd. All rights reserved.