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عنوان فارسی مقاله:
بتن پر شده فولاد بیضوی اعضای لوله با نسبت قطر بزرگ به ضخامت در معرض خمش
عنوان انگلیسی مقاله:
Concrete filled elliptical steel tubular members with large diameter-to-thickness ratio subjected to bending
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Concrete filled elliptical steel tubes, hereafter called CFEST, consist of elliptical steel tube members filled in with concrete as shown in Fig. 1. CFEST members belong to the concrete filled steel tube, CFT [1,2] family, holding good deformability and large seismic strength. When a CFEST member is applied to a steel–concrete composite bridge pier located at a river, reduction of the bottom scouring due to the water flow can be expected. Reviewing the past studies on elliptical hollow sections, EHS or CFEST (in-filled EHS), we can first find that elliptical steel tube and in-filled or un-filled concrete stub column tests [3,4,5]. Second, minor and major axes bending-shear tests of EHS beam were performed by Chan [6] and Gardner [7]. Then, flexural behavior of stainless steel oval hollow section (OHS) was investigated by Theofanous et al. [8]. Third, elastic buckling behavior and cross-section classification of EHS/OHS were discussed by Ruiz-Teran and Gardner [9] and Gardner and Chan [10]. Willibald et al. [11] and Sauced [12] investigated new applications of the EHS gusset plate connections which are regularly used in steel frames. Next, Episons et al. [13] conducted analytical studies on the fire resistance behavior of concrete filled EHS under compression. Last, studies on concrete filled EHS stub columns under eccentric compression were carried out experimentally by Sheehan et al.[14], and Insausti[15] carried out numerical studies applying a model of plastic collapse of EHS. Under the above-described background, the authors have conducted 21 axially loading tests on CFEST stub columns with large diameter-tothickness ratio (2a/t) and aspect ratios (a/b), which ranged from 69.6 to 160.0 and 1.5 to 2.5, respectively [16]. From the results of the stub column tests, it can be found that confinement effect between in-filled concrete and steel tubes did not change when diameter-to-thickness ratio (2a/t) became larger. In order to apply CFEST in practical use, it is necessary to investigate the mechanical behavior of CFEST members. The present study aims to investigate experimentally the pure bending characteristics of the CFEST beams with large diameter-to-thickness ratio (2a/t) ranging from 69.6 to 160.0 through the symmetric fourpoint loading testing method. Two testing parameters were selected: diameter-to-thickness ratio of elliptical steel tubes and loading directions, namely, minor and major axes. Moreover, pure bending behavior of CFEST member is compared with that of an ordinary CFT member, whose diameter-to-thickness ratio (2a/t) ranges from 34.8 to 160.0. A method to predict the pure bending capacity of CFEST beam is mainly discussed and biaxial stress behavior of the elliptical steel tubes is provided. A part of this study has been previously reported [17,18].
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کلمات کلیدی:
Kojiro UENAKA(Curriculum Vitae) www.kobe-kosen.ac.jp/~uenaka/index_e.html Apr 3, 2017 - A concrete filled elliptical/oval steel tubular, CFEST in abbreviation, member consists of elliptical/oval hollow steel tube and in-filled concrete. Tubular Structures XIV - Page vii - Google Books Result https://books.google.com/books?isbn=020307310X Leroy Gardner - 2012 - Technology & Engineering Elliptical. hollow. sections. Numerical modeling and design of cold-formed steel ... of beam to concrete filled elliptical steel column connections D. Lam & X.H. Dai ... steel CHS tubular members under axial compression and bending P. Pappa ... Tubular Structures XIII - Page 323 - Google Books Result https://books.google.com/books?isbn=1439862982 Ben Young - 2010 - Technology & Engineering concrete-filled. stainless. steel. elliptical. School of Engineering Design and ... The structural behaviour of stainless steel tubular members has been widely ... Fire resistance of innovative and slender concrete filled tubular ... https://bookshop.europa.eu/.../fire-resistance-of-innovative-and-slender-concrete-fille... Concrete-filled steel tubular (CFST) members are commonly used as ... while in practice columns with rectangular and elliptical hollow sections are being ... [PDF]Size Effect on the Behavior of Concrete Filled Steel Tubular Columns www.techrev.org.uk/jcec/2.2/JCEC.2.2.1.pdf by B He - Related articles Abstract: Concrete filled steel tubular (CFT) columns have been widely used in civil ... of short concrete-filled elliptical steel columns, such as the ultimate load ... effects on strength rising coefficient, so it is necessary to set each member have ...
