《Earthquake Engineering and Structural Dynamics》杂志刊登“用于基础隔震建筑物反应谱分析的修正阻尼组合规则”

作者：Giuseppe Muscolino, Alessandro Palmeri, Claudia Versaci

刊物：《Earthquake Engineering and Structural Dynamics》，2013年，42卷第2期，163-182页

关键词：基础隔震系统；（完全二次组合）规则；阻尼修正系数；随机振动理论；反应谱法

摘要：因经典反应谱法避免了大量非线性时域分析运算量，所以依然是设计基础隔震建筑物的常用方法。本文针对框架结构中提出了一种能进行结构抗震分析和基础隔震系统设计的新方法，并对其进行了数值计算验证，结果发现：该方法能够弥补基于反应谱法设计的主要不足。新方法的主要优点有以下几点：第一，相比于复模态分析减少了计算量，其是通过包含实特征值问题的两次坐标变换得到的；第二，有效替代阻尼是通过对隔震基础和上部结构的耦合动力系统的振动模型定义不同的粘性阻尼系数得到的；第三，易于使用，对组合系数的方便重组得到了一个新的修正阻尼组合规则，在这个组合规则里只需要一个反应谱来作为粘性阻尼系数的参考值。新方法的更适用于地震隔震系统可以被线性化的结构和非比例阻尼效应可以通过模型耦合关系测得，并在隔震基础和上部结构组合后可忽略的结构。

Damping-adjusted combination rule for the response spectrum analysis of base-isolated buildings

Authors: Giuseppe Muscolino, Alessandro Palmeri, Claudia Versaci

Journal: Earthquake Engineering and Structural Dynamics, Volume 42, Issue 2, pages 163–182, February 2013

Key words: BIS (base isolation system); CQC (complete quadratic combination) rule; DCF (damping correction factor); random vibration theory; RSM (response spectrum method)

Abstract: The classical response spectrum method continues to be the most popular approach for designing base-isolated buildings, therefore avoiding computationally expensive nonlinear time-history analyses. In this framework, a new method for the seismic analysis and design of building structures with base isolation system (BIS) is formulated and numerically validated, which enables one to overcome the main shortcomings of existing techniques based on the response spectrum method. The main advantages are the following: first, reduced computational effort with respect to an exact complex-valued modal analysis, which is obtained through a transformation of coordinates in two stages, both involving real-valued eigenproblems; second, effective representation of the damping, which is pursued by consistently defining different viscous damping ratios for the modes of vibration of the coupled BIS-superstructure dynamic system; and third, ease of use, because a convenient reinterpretation of the combination coefficients leads to a novel damping-adjusted combination rule, in which just a single response spectrum is required for the reference value of the viscous damping ratio. The proposed approach is specifically intended for design situations where (i) the dynamic behaviour of seismic isolators can be linearised and (ii) effects of nonproportional damping, as measured by modal coupling indexes, are negligible in the BIS-superstructure assembly. 

原文链接：http://onlinelibrary.wiley.com/doi/10.1002/eqe.v42.2/issuetoc