Research on Aseismic Behaviors of Reinforced Concrete Columns with Wallgirders Subjected by Two-directional Lateral Forces

单向带墙梁的钢筋混凝土柱，其剪跨比在该方向与横向上不同。因此，推测在每个方向上的横向力下发生的屈服铰链出现在彼此不同的部位，并且很可能在两个方向之间的破坏模式是不同的。两种柱横向配筋率和两种侧向加载方案。单向加载是指在墙梁方向和梁方向交替反向加载。双向加载方式是指柱顶沿椭圆轨道位移的循环加载，由于墙梁高度增大，柱的变形长度变短，柱的抗弯强度试验剪力比计算值大，这是因为屈服铰区所需位置增大。因此，这种列与剪切钢筋所需的顺序抗剪强度设计失败的剪力墙梁方向。但配以高剪力钢筋的柱具有抗弯强度和变形能力.墙梁方向柱杆曲率或应变的最大值出现在柱开口部位的稍外侧，梁方向柱杆曲率或应变的最大值出现在柱端部。与单向加载相比，双向加载下的极限抗弯强度和延性较小，但滞回线的能量吸收较大。

Reinforced concrete columns with wallgirders in one direction have different shear-span ratios between in this direction and in transverse direction. Therefore it is conjected that yield hinges occured under lateral forces in the each direction appear at different portions from each other and also it may well be that failure modes are different between both directions.Column specimens with a square section of 30cm by 30cm having wallgirders in one direction and beams in the other direction, consist of six variations under combinations of three types of wallgirder height, two types of column transverse reinforcement ratios and two types of lateral loading program. One-directional loading type means reversal loading a alternately in the wallgirder direction and the beam direction. Two-directional loading type means cyclic loading as the tops of columns are displaced with elliptical orbits.According as deformable length of the columns became short using by large depth of wallgirders, experimental column shear force at bending strength was larger than calcurate valure because required lotations in the yield hinge zones weregreater. Consequently such columns with shear reinforcement required by ordinal shear strength design failed in shear in the wallgirder direction. However such columns with high shear reinforcement exhibited bending strengthand deformability. The maximum values of curvature or strain of axial column bars in wallgirder direction appeared at the slightly outer sides of opening portions in the columns, and ones in beam direction appered at the ends of columns. Ulimate bending strength and ductility under two-directional lateral loading were smaller, but energy absorption of hysteresis loops was larger in comparison with those under one-directional loading, respectively.