Abstract Dynamic shear amplification has been commonly studied in cantilever reinforced concrete wall systems, however, coupling beams or slabs can generate axial loads that can modify the response. A parametric study is carried out that covers 432 nonlinear time-history analyses (72 models with 6 records) of 2 coupled walls with different length, including variations in the amount of boundary element steel ratio (1%, 3% and 5%), amount of slab steel ratio (0.0%, 0.3% and 0.6% − 0.0% is defined for connected walls without coupling), building height (25 m, 50 m and 75 m), and wall length (2 m, 4 m and 6 m). The walls are represented with nonlinear fiber models; while the coupling slabs are elastic within the length with a rigid-perfectly plastic model at both element ends. The shear amplification values depend on the coupling level, with the highest amplification values ​​being observed for connected (not coupled) systems. The high values ​​for connected walls are due to the rapid plastification of the wall because of the low structural redundancy. The mean shear amplification values are 1.45, 1.10 and 1.35 for coupling slabs with reinforcing steel ratio of 0.0%, 0.3% and 0.6%, respectively. The proposed expression for the dynamic shear amplification also depends on the response modification factor of the walls, a parameter directly related to nonlinearity sources. On the other hand, an expression used by many codes that depends on the number of floors does not necessarily represent the amplification that occurs in tall buildings with moderate coupling, since the plastification at the base in such cases is difficult to achieve given their large elastic displacement capacity, as well as, cases that incorporate a minimum base shear criterion, that reduce the nonlinearity incursions.

中文翻译：

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钢筋混凝土耦合墙的动态剪力放大

摘要 在悬臂钢筋混凝土墙系统中，动态剪切放大已得到普遍研究，然而，连接梁或板会产生轴向载荷，从而改变响应。进行了一项参数研究，涵盖了 2 个不同长度的耦合墙的 432 个非线性时程分析（72 个模型，6 个记录），包括边界元素钢比率（1%、3% 和 5%）数量的变化，板坯钢比（0.0%、0.3% 和 0.6% - 0.0% 定义为无耦合的连接墙）、建筑高度（25 m、50 m 和 75 m）和墙长（2 m、4 m 和 6米）。墙壁用非线性纤维模型表示；而耦合板在长度范围内是弹性的，并且在单元两端具有刚性完美的塑性模型。剪切放大值取决于耦合水平，对于连接（未耦合）系统，观察到的放大值最高。连接墙的高值是由于墙的快速塑化，因为结构冗余度低。钢筋配比为0.0%、0.3%和0.6%的接箍板的平均剪切放大值分别为1.45、1.10和1.35。动态剪切放大的建议表达式还取决于墙的响应修正系数，这是一个与非线性源直接相关的参数。另一方面，许多代码使用的依赖于楼层数的表达式并不一定代表在中等耦合的高层建筑中发生的放大，因为在这种情况下，由于它们的弹性很大，很难实现底部的塑化。位移能力，