Overstrength and force reduction factors of multistorey reinforced‐concrete buildings
Overstrength and force reduction factors of multistorey reinforced‐concrete buildings
复制标题
多层钢筋混凝土建筑的超强及力折减系数
DOI：
10.1002/tal.204
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Mwafy
中科院分区：
文献类型：
--
作者：
A. Elnashai;A. Mwafy
本文讨论了现代规范设计的钢筋混凝土（RC）建筑中的水平超强度问题。研究了抗侧承载力、设计力折减系数、延性水平和超强系数之间的关系。的横向承载力和超强系数估计通过非弹性静力推覆以及时程倒塌分析的12个建筑物的各种特征，代表了广泛的当代钢筋混凝土建筑。强调了采用结构的伸长周期来获得设计力的重要性。预测这一时期的自由振动分析采用“有效”弯曲刚度的影响。研究证实了设计中所采用的力折减系数与结构的抗侧能力之间存在直接关系。并提出了按欧洲规范8设计的中、低周期钢筋混凝土结构的保守超强度。最后，力折减系数对常用的超强定义的影响被强调。强调了在超强因子旁边使用额外的响应测量的优点。这是超强系数和力折减系数之间的比值，称为固有超强（Ωi）。建议的措施提供了更有意义的结果储备强度和结构响应比超强和力折减系数。版权所有© 2002年约翰威利父子有限公司。
This paper addresses the issue of horizontal overstrength in modern code-designed reinforced-concrete (RC) buildings. The relationship between the lateral capacity, the design force reduction factor, the ductility level and the overstrength factor are investigated. The lateral capacity and the overstrength factor are estimated by means of inelastic static pushover as well as time-history collapse analysis for 12 buildings of various characteristics representing a wide range of contemporary RC buildings. The importance of employing the elongated periods of structures to obtain the design forces is emphasized. Predicting this period from free vibration analysis by employing ‘effective’ flexural stiffnesses is investigated. A direct relationship between the force reduction factor used in design and the lateral capacity of structures is confirmed in this study. Moreover, conservative overstrength of medium and low period RC buildings designed according to Eurocode 8 is proposed. Finally, the implication of the force reduction factor on the commonly utilized overstrength definition is highlighted. Advantages of using an additional measure of response alongside the overstrength factor are emphasized. This is the ratio between the overstrength factor and the force reduction factor and is termed the inherent overstrength (Ωi). The suggested measure provides more meaningful results of reserve strength and structural response than overstrength and force reduction factors. Copyright © 2002 John Wiley & Sons, Ltd.