Efficient analysis of flat slab structures subjected to lateral loads

Kim, H.-S.; Lee, D.-G.

doi:10.1016/j.engstruct.2004.10.005

Cited by 20 publications

(21 citation statements)

References 3 publications

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“…Kim ve Lee (2005) yaptıkları çalışmada doğru sonuçlar elde etmek için hayali kirişler ve matris tekniğinin kullanıldığı etkili bir analiz yöntemi önermişlerdir. Sonuçta önerilen metot sonlu elemanlar yöntemi ve eşdeğer çerçeve yöntemi ile karşılaştırılarak doğrulanmıştır [1]. Sağlayan ve diğ.…”

Section: Introductionunclassified

Comparison of Different Analysis Methods in Flat Slab Reinforced Concrete Structures Under Earthquake Effect

Özbayrak¹

2019

Pamukkale J Eng Sci

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Betonarme kirişsiz plak döşeme sistemlerinde döşemeler, kirişler olmadan doğrudan kolonlara mesnetlenmektedir. Analitik çalışmalar doğrultusunda deprem etkisi altında betonarme kirişsiz plak döşemeli 4 katlı bir yapı araştırma konusu olarak seçilmiştir. Seçilen yapı 3 farklı analiz yöntemi kullanılarak taşıyıcı sistem kolon ve döşemelerine gelen eğilme momentleri açısından karşılaştırılmıştır. Bu çalışmada, kirişsiz plak döşeme sistemleri hakkında açıklayıcı bilgiler sunulmuş ve ülkemiz şartnamelerinde kabul edilen farklı çözüm yöntemleri, yatay yükler etkisi altındaki yapısal bir örnek üzerinden karşılaştırılmıştır. Deprem kuvvetleri etkisinde; seçilen taşıyıcı sistem, eşdeğer çerçeve yöntemi, Ünlüoğlu'nun moment geçiş katsayılarını kullandığı yöntem ve sonlu elemanlar yöntemini temel alan SAP2000 programı kullanılarak analiz edilmiştir. Farklı çözüm yöntemlerinden elde edilen sonuçların birbirleri ile karşılaştırılması sonucu tüm katlardaki kolon alt ve üst momentleri, iç ve kenar açıklık kolon şeridindeki döşeme momentleri, tablo ve grafikler yardımıyla ortaya konmuştur. Buna göre Ünlüoğlu'nun moment geçiş katsayılarını kullandığı yöntem ve sonlu elemanlar yöntemini esas alan SAP2000 yazılımından elde edilen sonuçlar birbirine son derece yakın çıkmıştır. Eşdeğer çerçeve yönteminden elde edilen sonuçlar ise diğer analiz yöntemlerinden elde edilen sonuçlardan daha farklıdır. Çünkü eşdeğer çerçeve yöntemi yaklaşık bir yöntem olması sebebiyle sonlu elemanlar yöntemi ile elde edilen sonuçlar kadar kesin sonuçlar vermemektedir. Ancak Ünlüoğlu'nun geliştirdiği yöntem sonlu elemanlar yöntemine alternatif olabilir.Reinforced concrete flat slab systems are supported to columns directly without beams. In this analytical study, a structure which has reinforced concrete flat slab with four storey is investigated under earthquake effect. The structure was analyzed by three different methods to compare bending moments in columns and flat slabs. In this study, explanatory information about flat slab systems is presented and different types of solution methods which are adopted our countries specification was compared through a structural example under the horizontal loads. Under the influence of horizontal earthquake forces; selected bearing system have been analyzed by the equivalent frame method, called the moment transfer coefficients method developed by Ünlüoğlu and finite elements method based SAP2000 software. The result of comparing the findings obtained from different solution methods to each other is presented with the help of column top and bottom moments in all floors, flat slab bending moments in inner and edge column strands, tables and graphs. According to this, the method developed by Ünlüoğlu using moment transfer coefficients and the results obtained from finite elements based SAP2000 software are very close to each other. The results obtained from the equivalent frame method are different from those result of the other methods of analysis. Because the equivalent frame method is an approximate method, it does...

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Section: Introductionunclassified

Comparison of Different Analysis Methods in Flat Slab Reinforced Concrete Structures Under Earthquake Effect

Özbayrak¹

2019

Pamukkale J Eng Sci

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“…According to the physical similarity between the slab-column connections and the nonplanar beamwall connections, certain solutions of the slab-column connection under lateral loading can be applied to the nonplanar beam-wall joints (Chen et al, 2011), where the equivalent frame model (Pecknold, 1975;Wong and Coull, 1980;Farhey et al, 1992;Kim and Lee, 2005) and the unbalanced bending moment (Long et al, 1978;Alexander and Simmonds, 2003;Park and Choi, 2007;Choi et al, 2014) are applicable.…”

Section: Introductionmentioning

confidence: 99%

Equivalent frame analysis for effective wall width of nonplanar beam–wall connections

Behnam

Kuang

Huang

2016

Structural Design Tall Build

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Summary Shear wall–frame structural systems are the most commonly used structural forms in tall buildings. In this structural system, many nonplanar beam–wall connections are formed by frame beams connecting to a shear wall in their out‐of‐plane direction. Few studies on nonplanar beam–wall joints have been conducted. This paper presents an investigation of the mechanical performance of nonplanar beam–wall joints based on the equivalent frame model assumptions. The concept of the effective wall width is introduced, and an analytical model is derived by considering the rotational stiffness of a beam–wall joint. The proposed effective wall width model is verified by experiments and finite element analyses. Comparison of the proposed model with the existing models shows that all the key design variables that affect the effective wall width in nonplanar beam–wall connections, in particular the cross‐sectional dimensions of beams and shear walls, have been appropriately included in deriving the proposed model based on structural mechanics. The applicability and accuracy are demonstrated by a design example. It is shown that the proposed analytical model of the effective wall width for nonplanar beam–wall connections provides a simple and effective, yet accurate, means of analysis for the coupling effect of nonplanar coupling beams in tall buildings. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Moreover, a flat slab system consisting only of flat slabs is more flexible than conventional frames because of the absence of deep beams and/or shear walls (Erberik and Elnashai, ). Compared with conventional frames, it is advantageous for providing a lower storey height, better lighting and ventilation, more clear spaces/unobstructed space, easy arrangement of pipes and wires under slabs, architectural flexibility and easier formwork, which consequently makes the construction period shorter (Kim and Lee, ; Hueste and Bai, , ; Islam et al ., , ). A box system consists only of reinforced concrete (RC) walls and slabs as the structural system (Kim et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Optimum structural modelling for tall buildings

Jameel

Islam

Hussain

et al. 2012

Structural Design Tall Build

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It is a common practice to model multi-storey tall buildings as frame structures where the loads for structural design are supported by beams and columns. Intrinsically, the structural strength provided by the walls and slabs are neglected. As the building height increases, the effect of lateral loads on multi-storey structures increases considerably. The consideration of walls and slabs in addition to the frame structure modelling shall theoretically lead to improved lateral stiffness. Thus, a more economic structural design of multi-storey buildings can be achieved. In this research, modelling and structural analysis of a 61-storey building have been performed to investigate the effect of considering the walls, slabs and wall openings in addition to frame structure modelling. Sophisticated finite element approach has been adopted to configure the models, and various analyses have been performed. Parameters, such as maximum roof displacement and natural frequencies, are chosen to evaluate the structural performance. It has been observed that the consideration of slabs alone with the frame modelling may have negligible improvement on structural performance. However, when the slabs are combined with walls in addition to frame modelling, significant improvement in structural performance can be achieved.

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Efficient analysis of flat slab structures subjected to lateral loads

Cited by 20 publications

References 3 publications

Comparison of Different Analysis Methods in Flat Slab Reinforced Concrete Structures Under Earthquake Effect

Comparison of Different Analysis Methods in Flat Slab Reinforced Concrete Structures Under Earthquake Effect

Equivalent frame analysis for effective wall width of nonplanar beam–wall connections

Optimum structural modelling for tall buildings

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