KEYWORDSPeriod; In ll wall thickness; In ll wall elasticity modulus; RC structures; Modal analysis.Abstract. Estimation of a proper fundamental vibration period is an important issue in the process of the design and/or evaluation of a building. Mostly, in ll walls are assumed nonstructural elements which are ignored in the estimation of the vibration period of a building in terms of sti ness. However, studies showed that in ll wall has signi cant e ect on vibration period and should be considered in the estimation of period. Even in ll walls are considered by some proposed equations in the estimation of period, they do not consider the e ect of in ll wall sti ness. In this study, an empirical equation is proposed as a function of building height, elasticity modulus of in ll wall, and thickness of in ll wall. For this purpose, building periods were determined with considering di erent in ll wall elasticity moduli, in ll wall thicknesses (thus, di erent in ll wall sti ness), and building heights. Nonlinear regression analyses were conducted with a comprehensive statistical study. E ect of elasticity modulus and thickness of in ll wall on vibration period was investigated. Finally, comparisons between the proposed equation of this study and those of previous studies were conducted.
Seismic demand estimation for a structure is a critical issue for seismic performance assessment so that the potential damage can be estimated realistically. Many researchers proposed simplifi ed methods to estimate the demand of a structure under strong ground motions. However, most of them did not consider degradation and collapse potential of the structures. Even some of theme considered the degradation effect, stiffness and strength degradation effects were considered separately without collapse potential caused by dynamic instability. In this study, collapse potential of SDOF systems caused by dynamic instability with stiffness and strength degradation has been investigated. Nonlinear time history analyses were performed, using an energy-based, strength and stiffness degraded hysteretic model that considers the collapse potential, with 160 earthquake acceleration time histories. An equation was proposed for the estimation of collapse period of SDOF systems as a function of certain strength reduction factor, ductility level and post-capping stiffness ratio. Finally, effects of parameters of the considered hysteretic model and local site conditions on the collapse period were investigated.
Bina tasarımında doğal periyotların elde edilmesi önemli bir husustur. Kat adedi az, düzensizliklerin olmadığı binalarda hakim mod öteleme modudur ve bu tip binaların tek serbestlik dereceli gibi düşünülmesi mümkündür. Öteleme modu hakim ve eşdeğer tek serbestlik dereceli olarak kabul edilebilecek binaların deprem yükleri altındaki tasarımında tek mod kullanılabileceğinden, yalnızca bu modun periyodunu elde etmek yeterli olacaktır. Uzun hesaplara gerek olmadan hızlı bir şekilde bu periyodu elde etmeye yarayacak doğrudan formüller literatürde çeşitli çalışmalarda önerilmiştir. Binalarda odalar oluşturabilmek amacıyla duvarlar örülmektedir ve bu duvarların rijitliğe olan katkısı ile periyodu değiştireceği açıktır. Fakat tasarım sırasında duvarların rijitliğe katkısı ihmal edilmekte yalnızca ağırlığı dikkate alınmaktadır. Literatürde periyot elde edebilmek için önerilen doğrudan formüllerin bazıları duvarın etkisini dikkate almazken bazıları duvar rijitliğinin katkısını hesaba katmaktadır. Bu çalışmada, Türkiye'deki bina stoğunu temsil edebileceği düşünülen 6 katlı betonarme çerçevelerden oluşan bir binanın hakim periyodu hem SAP2000 programında modellenerek analitik olarak hem de doğrudan formüller ile elde edilmiştir. Duvarlı ve duvarsız olmak üzere iki ayrı model ile bina periyotlarının elde edildiği bu çalışmada, önerilen formüllerin periyodu elde etmedeki yaklaşıklıkları ve duvar etkisini ne kadar dikkate aldıkları araştırılmıştır.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.