ABSTRACT

Buildings are found to be more vulnerable in near-fault regions such that they should be designed with higher strength. In this study, the importance of pulse period and peak ground velocity on the efficiency of the strong column-weak beam ratio (SCWBR) is evaluated through incremental nonlinear dynamic analysis. This work involved two aspects: improving the collapse capacity of structures and mitigation of column damage. Three 4, 8, and 12 story moment frames with varying SCWBR (from 1.2 to 3.0) are subjected to two sets of 44 far-fault and 91 near-fault ground motions. Plastic rotation of elements is utilized as a damage measure for beams and columns. The results demonstrate that idealization of collapse mechanism and early yielding of base columns are controlling factors for the 4 and 12 story buildings, respectively, in particular under long-pulse periods. Moreover, the 8 story (mid-rise) building obtains the highest improvement in the collapse capacity (up to 90%) by the increase of the SCWBR. The most dispersion in the efficiency of the SCWBR among short and large pulse period is observed for the 12 story (high-rise) building. It is also observed that the height-wise distribution of the SCWBR is significantly affected by variation in the pulse period and building height

摘要

建筑物被发现在近断层区域更容易受到破坏，因此它们应该设计得更高强度。本研究通过增量非线性动力学分析评估脉冲周期和峰值地速对强柱弱梁比（SCWBR ）效率的重要性。这项工作涉及两个方面：提高结构的倒塌能力和减轻柱损坏。三个具有不同SCWBR的 4、8和 12 故事时刻框架（从 1.2 到 3.0）受到两组 44 次远断层和 91 次近断层地震动。元件的塑性旋转被用作梁和柱的损坏度量。结果表明，倒塌机制的理想化和基柱的早期屈服分别是 4 层和 12 层建筑的控制因素，特别是在长脉冲周期下。此外，8层（中层）建筑由于SCWBR的增加，其倒塌能力的改善最高（高达90%） 。在 12 层（高层）建筑中观察到SCWBR效率在短脉冲和大脉冲周期中的最大离散度。还观察到SCWBR的高度分布受脉冲周期和建筑物高度变化的显着影响