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Evaluation of fundamental period of low-rise and mid-rise reinforced concrete buildings

机译：低层和中层钢筋混凝土建筑基本周期评估

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摘要

Fundamental period of vibration appears to be one of the most critical parameter for the seismic design of buildings because this period strongly affects the magnitude of seismic forces. In this paper, an empirical formula for estimating the fundamental period of reinforced concrete structures is recommended, on the basis of the vibration analysis of 20 different real building configurations. These structures have already been constructed in Greece, and they are analyzed by using in detail 3-D finite element models and modal eigenvalue analysis. These models take into account the presence of external and internal infill walls, which are usually ignored as nonstructural elements. This neglect leads to unreliable evaluation of period because the infill walls' contribution to the lateral stiffness and therefore to the fundamental period of vibration is also ignored. Furthermore, taking into account that the flexibility of soil elongates the fundamental period, the soil-structure interaction effect is also considered. To achieve a unique, simple, and effective empirical expression for the fundamental period of vibration, a comprehensive nonlinear regression analysis is applied for the datasets of buildings under consideration. This empirical expression is also compared with the similar expressions from the pertinent literature.
机译：振动的基本周期似乎是建筑物抗震设计的最关键参数之一，因为该周期会严重影响地震力的大小。本文在对20种不同的实际建筑结构进行振动分析的基础上，提出了估算钢筋混凝土结构基本周期的经验公式。这些结构已经在希腊建造，并通过使用3-D有限元模型和模态特征值分析进行了详细分析。这些模型考虑了内部和外部填充墙的存在，通常将其视为非结构性元素而忽略。这种忽略导致对周期的评估不可靠，因为填充壁对横向刚度的贡献以及对基本振动周期的贡献也被忽略了。此外，考虑到土壤的柔韧性延长了基期，因此还考虑了土壤与结构的相互作用。为了获得振动基本周期的唯一，简单和有效的经验表达式，对所考虑建筑物的数据集进行了全面的非线性回归分析。还将该经验表达与来自相关文献的相似表达进行比较。

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