Effects of Walls on the Seismic Behavior of Reinforced Concrete Structures

剪力墙效应一般情况下，在设计偏心结构时，只考虑楼层重心的相对位移。分析了各框架的相对楼层位移。我们对各种模型进行了分析。即使按弹性刚度计算的偏心比相同，重力偏心的模型比刚度偏心的模型更需要注意，因为前者的模型受扭矩的影响更大。即使按弹性刚度计算的偏心率相同，随着墙体数量的增加，增加层强度的系数也会增大。翼墙的作用1)翼墙对柱子抗弯强度的影响分析结果表明，带翼墙柱的弯矩与轴力的关系不同于矩形截面柱。用现有的常规公式计算翼墙柱的抗弯强度与解析值不符。2)翼墙对柱抗剪强度的影响通过带翼墙柱的试验，研究了配筋对柱抗剪破坏和强度的影响。提出了一种新的考虑剪切破坏模式的抗剪强度公式。该公式考虑了钢筋和轴力对混凝土抗压强度的影响。在发生滑动剪切破坏的情况下，v减小。计算值与实测值吻合较好。

EFFECT OF SHEAR WALLGenerally, only the relative story displacements of the center of gravity are examined, in the case to design the structure with eccentricity. The relative story displacements of every frame are examined. We analyze the various models. The attention is necessary for the model with eccentricity by the gravity than the model with eccentricity by the stiffness, even if the ratio of eccentricity calculated with elastic stiffness is same level, because the model of the former is influenced in torsional moment more. The coefficient, which increases strength of the story, is increased as the quantity of wall is increased, even if the ratio of eccentricity calculated with elastic stiffness is same level. It needs that the coefficient, which increases strength of each frame and each story, are considered every structure.EFECT OF WING WALL1)The influence of the wing walls on the flexure strength of the columnsThe analytical results showed that the relationship between the moment and the axial force of the columns with wing walls is different from that of the rectangular cross-section. The flexure strength calculated by the existing conventional equations for columns with wing walls dose not accord with the analytical value of that. The calculated value by the new flexure strength formula in this study has good accordance with the test and analytical value.2) The influence of the wing walls on the shear strength of the columnsThe experiment in the column with wing walls and investigated the effect of the reinforcement bars on the -shear failure and strength. We presented a new shear strength formula considering shear failure modes. In this formula, the effective factor of compressive strength of concrete is taken account of the effect of the reinforcement bars and an axial force. In the case the sliding shear failure occurred, v is reduced. The calculated value by that has good accordance with the test values.