Past earthquakes, in many instances, have demonstrated poor performance of commonly used built‐in staircase configurations. Codal provisions in India pertaining to staircases present a rather simple approach wherein the effects of built‐in staircases on the overall dynamic properties or on the local behavior of structures are not addressed explicitly. Studies in the past have highlighted the scale of such effects, but most of them have relied completely on analytical models of buildings. This study analyzes the adequacy of the codal provisions by investigating two finite element (FE) models calibrated using ambient and forced vibration measurements. The effects of variations in building height, layout of staircase in plan, and presence of masonry infill walls in stairwells are also examined. The codal guidelines regarding empirical estimation of period and provision of enclosure walls around built‐in staircases are found to be adequate. However, for the case of built‐in staircases without enclosure walls, the force and displacement demands on landing beams are found to be considerably high. Drift‐based approaches to estimate these demands are proposed.

中文翻译：

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内置楼梯对钢筋混凝土建筑物动力影响的实验和参数研究

在许多情况下，过去的地震表明，常用的内置楼梯配置的性能较差。印度与楼梯有关的粗俗规定提供了一种相当简单的方法，其中未明确解决内置楼梯对整体动力特性或结构局部行为的影响。过去的研究强调了这种影响的规模，但大多数都完全依赖于建筑物的分析模型。这项研究通过调查使用环境振动和强制振动测量校准的两个有限元（FE）模型，分析了辅助物的充足性。还检查了建筑物高度变化，平面图中楼梯布局的影响以及楼梯间中砌体填充墙的存在。人们发现，关于经验估算周期和在内置楼梯周围设置围墙的指导方针是足够的。但是，对于没有围墙的内置楼梯，发现对落地梁的作用力和位移要求很高。提出了基于漂移的方法来估计这些需求。