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首页> 外文会议>World conference on earthquake engineering;WCEE >SEISMIC PERFORMANCE EVALUATION OFRC ECCENTRIC BEAM-COLUMN JOINTS USINGTHREE-DIMENSIONAL FEM ANALYSIS
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SEISMIC PERFORMANCE EVALUATION OFRC ECCENTRIC BEAM-COLUMN JOINTS USINGTHREE-DIMENSIONAL FEM ANALYSIS

机译：三维有限元分析的钢筋混凝土偏心梁柱节点抗震性能评估

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Usually, most of beam-column joints in a reinforced concrete (RC) building are concentric, as in the casewhen beam and column axes are in the same plane. For architectural reasons, however, it is notuncommon construction of eccentric beam-column joints in the exterior frames of RC buildings. Ineccentric beam-column joints, the axis of the spandrel beams is offset from the axis of column. As forthese eccentric joints subjected to earthquake loads, it was considered that additional shear forces,produced by torsion moment from beams, severely act on the joints. Moreover, brittle shear failures ofeccentric joints subjected to additional shear forces were observed from the previous earthquake damages.In order to investigate the effect of eccentricity on degradation of shear strength, stiffness and deformationcapacity of beam-column joints, non-linear analyses using a three-dimensional finite element method (3-DFEM), which is very useful to get the rational solution of 3-D stress conditions, have been carried out inthis study. Reference specimens for this 3-D FEM analysis were selected from the previous experimentalstudy. Reference specimens failed in joint shear failure after beam flexural yieldings in the tests. The FEMresults show a good agreement with the test results on the maximum story shear forces and the failuremodes. When the beam flexural yieldings have occurred, the maximum story shear forces did not increase.Moreover, in order to understand the shear transfer mechanisms in an eccentric beam-column joint, theinternal stress flows of both concentric and eccentric joints obtained from analytical results werediscussed in detail. In spite of the same maximum story shear forces, it was recognized that the internalconcrete stresses concentrated severely to the eccentric side in a joint.
机译：通常，钢筋混凝土（RC）建筑物中的大多数梁柱节点都是同心的，就像梁和柱轴在同一平面上一样。但是，出于建筑原因，在RC建筑物的外部框架中偏心梁柱节点的构造并不常见。偏心的梁柱节点，翼梁的轴线偏离圆柱的轴线。由于这些偏心关节受到地震载荷的作用，因此人们认为，梁的扭转力矩所产生的附加剪切力会严重作用于关节。此外，还从以前的地震破坏中观察到了受到额外剪力作用的偏心节点的脆性剪切破坏。为了研究偏心率对梁柱节点抗剪强度，刚度和变形能力的降低的影响，使用三个非线性分析本研究已经进行了三维有限元方法（3-DFEM），它对于获得3-D应力条件的合理解非常有用。从先前的实验研究中选择了用于此3-D FEM分析的参考样本。在测试中，梁弯曲屈服后，参考试样的联合剪切失效。有限元结果与最大层剪力和破坏模式的测试结果吻合良好。当梁发生弯曲屈服时，最大层剪力没有增加。此外，为了了解偏心梁柱节点的剪力传递机理，讨论了分析结果得到的同心节点和偏心节点的内部应力流。详情。尽管最大楼层剪切力相同，但人们认识到内部混凝土应力严重集中在关节的偏心侧。

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