《Earthquake Engineering and Structural Dynamics》杂志刊登“中低层钢筋混凝土建筑物基本周期的估计”

作者：George D. Hatzigeorgiou; George Kanapitsas

刊物：《Earthquake Engineering and Structural Dynamics》，2013年，42卷第11期， 1599—1616页

关键词：建立周期公式；钢筋混凝土建筑物；抗震设计

摘要：由于基本震动周期对地震荷载的影响比较显著，因此它是结构抗震设计中的最重要参数。本文介绍了一个由20个不同的真实结构的振动分析而构建的用于估计钢筋混凝土结构基本周期的经验公式。所采用的结构为希腊已建造建筑物，这些建筑物已经用3维有限元模型进行了模态分析。以前的经验公式直接将内、外填充墙简化为非结构化单元，然而填充墙的存在影响结构的横向刚度，这一简化使得基本周期的计算结果不真实。此外，由于土的弹性作用会延长结构的基本自振周期，因此需要考虑土-结构相互作用。为了建立一个唯一、简单、有效的经验公式来计算结构的基本自振周期，本文对建筑物的数据集非线性回归分析。最后将该经验公式与其他相关文献中的相似公式进行比较。

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

Authors: George D. Hatzigeorgiou; George Kanapitsas

Journal: Earthquake Engineering and Structural Dynamics, Volume 42, Issue 11, pages1599-1616, September 2013

Key words: building period formula; reinforced concrete buildings; seismic design

Abstract: 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. 

原文链接：http://onlinelibrary.wiley.com/doi/10.1002/eqe.2289/abstract