An elastic theory for the torsional strength of rectangular reinforced concrete beams

Cowan, Henry J.

doi:10.1680/macr.1950.2.4.3

Cited by 28 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Malzeme olarak tek başlarına iyi bir çekme gerilmesi, lineer elastik davranış sergilemelerine rağmen CFRP çubuklar beton içerisine gömülmesiyle aynı verim elde edilememiştir. [60,61] daha sonra ise 1951 yılında Henry J. Cowan [62] tarafından yapılmıştır. Daha sonra dairesel veya dikdörtgen kesitli kirişlerin burulma davranışı üzerine yapılan çalışmalar 1960'lı yıllarda artmıştır.…”

Section: şEkil 12unclassified

Betonarme Perde Duvarlarin Yapi Malzemesi̇ Açisindan Değerlendi̇ri̇lmesi̇

Aydın¹,

Bayrak²

2020

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

View full text Add to dashboard Cite

Perde duvarlar yüksek yanal rijitliklerinden dolayı deprem, rüzgâr gibi yatay kuvvetlerini karşılamada en çok tercih edilen yapı elemanlarıdır. Gelişen teknoloji ile birlikte hem yapı malzemelerindeki hem de deney düzeneklerindeki gelişmeler ışığında perde duvarların farklı yöntemlerle incelenmesine olanak sağlanmıştır. Bu çalışma kapsamında uzun yıllar boyunca betonarme perde duvarlar için genel kabul görmüş parametreler yerine yenilikçi malzemeler ve deney koşulları bakımından ele alınmıştır. Betonarme perde duvarlar gerek lifli beton, hafif veya yüksek dayanımlı beton, FRP donatılar gibi malzemeler gerekse de donma-çözülme, korozyon, güçlendirme gibi amaçlarla irdelenmiştir. Yüksek katlı binalarda kullanımı neredeyse zorunlu hale gelen betonarme perde duvarların önümüzdeki yıllar içerisinde geleneksel çelik donatı düzeninin yerine daha yüksek mekanik ve durabilite özelliklerine sahip donatılara, geleneksel betonun yerine geleneksel betonun zayıflıklarının giderileceği özel çimento esaslı kompozitlerle üretileceği aşikârdır. Bununla birlikte tipik beton ve donatılı perde duvarlar yerine kompozit malzemelere kayacağı da beklenilmektedir. Çalışma kapsamında betonarme perde duvarların yapı malzemeleri perspektifinde davranışları ele alınmıştır.Shear walls are the most preferred structural elements to resist the horizontal loads due to high lateral stiffness. With the advancing technology, it has allowed the shear walls to be examined with different methods in the light of developments in both building materials and experimental setups. RC shear walls have been examined in terms of both the materials such as fiber concrete, lightweight concrete, high-strength concrete, fiber-reinforced polymer (FRP) bars, freeze-thaw resistance, corrosion resistance, and strengthening. It is expected that RC shear walls will be produced with reinforcements with higher mechanical and durability characteristics in the coming years, instead of the conventional steel reinforcement arrangement. It is obvious that instead of conventional concrete, it will be produced with special type cement-based composites, where the weaknesses of conventional concrete will be eliminated. The paper presents the behavior of RC shear walls within the constructional materials perspective.

show abstract

Section: şEkil 12unclassified

Betonarme Perde Duvarlarin Yapi Malzemesi̇ Açisindan Değerlendi̇ri̇lmesi̇

Aydın¹,

Bayrak²

2020

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

View full text Add to dashboard Cite

show abstract

“…Most of relevant research has been focused on contributions of the concrete slab towards the torsional strength. Hsu [26] reviewed several classical theories dealing with the pure torsion, including Rausch's Space Truss Analogy (STA) [28], Cowan's Efficiency Coefficient (CEC) [29] as well as theories of Hsu himself based on PCA tests (PCA) [30] and Skew-Bending Theory (SBT) [31] which served as a basis of the design for torsion since the 1971 ACI Codes [26].…”

Section: Torsional Strengthmentioning

confidence: 99%

Strength of multi-span composite beams subjected to combined flexure and torsion

Ban

Tan

2015

Journal of Constructional Steel Research

View full text Add to dashboard Cite

“…The purpose of the present study is to examine this question, drawing on the valuable experimental evidence already documented in the literature (18,20,23). Although there are many other valuable test data on torsion failures (1, 2,15,17,21,22,24,25,[28][29][30][31][32][33][34], they cannot be used in this study because they give no information on the size effect.…”

Section: Fig 1 Size Effect Lawmentioning

confidence: 99%

Size Effect in Torsional Failure of Concrete Beams

Bažant

Şener

1987

J. Struct. Eng.

View full text Add to dashboard Cite

The paper examines whether the size effect law for failures due to distributed cracking. recently derived from fracture mechanics arguments. is applicable to torsional failure of unreinforced or longitudinally reinforced concrete beams of rectangular cross section without stirrups. The test data available in the literature are used for thi:o; purpose. They confirm that a size effect is present and does not disagree with the size effect law. However, the data range is so narrow and their scatter so large that the precise form of the size effect cannot be identified. A simple. theoretically based formula to take the size effect into account is suggested. INTRODUCTtONAlthough, whenever possible, it is desirable to design concrete structures to fail in a ductile manner, brittle failures cannot be avoided in some well-known situations. While in ductile failures the load remains constant at increasing deformation after the ultimate state is reached, in brittle failures the load decreases after the ultimate state. The phenomenon of load decrease after the peak has a profound effect on the behavior and safety margins of the structure, and its most significant manifestation is perhaps the size effect. Whereas for plastic behavior (assumed in limit analysis) geometrically similar structures of different sizes fail at the same nominal stress level. for brittle behavior, the larger Ihe structure, the smaller is the nominal stress at failure. This property is a consequence of the fact that if the load decreases after the peak, the failure cannot be simultaneous but occurs through propagation of a failure zone across the structure, one part having already failed when another part reaches its peak capacity. In a larger structure, this propagating, nonsimultaneous nature of failure is more marked. In energy terms, the previously failed regions of the structure cause elastic energy to be released into the currently failing regions and thus help to drive the failure. In a larger structure, the energy release available for further propagating the failure is greater, and hence the size effect.In previous studies (5,12,9-11), the size effect has been analyzed for the diagonal shear failure of concrete beams with longitudinal reinforcement, and both without and with stirrups; for diagonal shear failure of prestressed concrete beams; for punching shear failure; and for beam and ring failures of unreinforced pipes. Another important type of brittle failure is the torsional failure, and for theoretical reasons as well as by analogy with FIG. 1. Size Effect Lawthe results of previous studies, the existence of the size effect should be expected. The purpose of the present study is to examine this question, drawing on the valuable experimental evidence already documented in the literature (18,20,23). Although there are many other valuable test data on torsion failures (1,2,15,17,21,22,24,25,(28)(29)(30)(31)(32)(33)(34), they cannot be used in this study because they give no information on the size effect. SIZE EFFECT LAWThe size...

show abstract

An elastic theory for the torsional strength of rectangular reinforced concrete beams

Cited by 28 publications

References 0 publications

Betonarme Perde Duvarlarin Yapi Malzemesi̇ Açisindan Değerlendi̇ri̇lmesi̇

Betonarme Perde Duvarlarin Yapi Malzemesi̇ Açisindan Değerlendi̇ri̇lmesi̇

Strength of multi-span composite beams subjected to combined flexure and torsion

Size Effect in Torsional Failure of Concrete Beams

Contact Info

Product

Resources

About