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عنوان فارسی مقاله:
تاثیر بتن قدرت فوق العاده بالا در گرد ستون های فلزی پر بتن
عنوان انگلیسی مقاله:
Influence of Ultra-high Strength Concrete on Circular Concrete-filled Dual Steel Columns
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
Among the uses of concrete-filled steel tubular (CFST) columns, the construction of high-rise buildings and bridge piers are two of the most common applications and, in these situations, these members are subjected to considerably high compression axial loads. Therefore, together with the increase in the usage of CFT columns, the employment of high strength concrete (HSC) and even ultra-high strength concrete (UHSC) in this type of composite columns is becoming popular given their capability of improving the load-bearing capacity of the member with a reduced technological cost. However, the application of high strength materials results in an increment in the member slenderness due to the reduction of the strictly needed net cross-sectional area of the composite column. As a consequence, new buckling problems arise which negatively affect the structural response of the column, especially in the fire situation. With the aim of reducing these drawbacks, in the last years new innovative configurations have appeared based on the same technology of combining hollow steel tubes and concrete. This is the case of concrete- filled dual steel tubular (CFDST) columns where an extra inner tube is placed concentrically as shown in Fig. 1. Among CFDST columns, two variants can be found: double-skin members (Fig. 1a), where the inner tube is empty, and those known as double-tube members (Fig. 1b), where concrete is also poured into the inner steel tube. Thus, for the same load-bearing capacity, CFDST columns are not only able to maintain but also to improve the numerous positive attributes that CFST columns already have at ambient temperature but with lighter self-weight. With regard to the structural behaviour at high temperature, this novel type of cross-section can be designed to solve some of the buckling related disadvantages presented above since the existence of an inner steel tube at a lower temperature can contribute to counteract the second order effects in slender columns. Besides, the double-tube configuration allows placing concrete of different grades at the inner core and at the outer ring respectively. This versatility can help to relieve spalling problems which are directly related to the employment of UHSC if it is poured in those parts of the column at lower temperature which, in turn, increases the UHSC effectiveness. Most of the experimental works performed to characterize CFDST sections have focused on stub columns with double-skin sections. In this line, the main contributions can be found in published works [1–5]. Thus, Zhao and Grzebieta [1] and Elchalakani et al. [4] carried out experimental campaigns on stub columns with SHS-SHS and CHSSHS respectively. In both campaigns the outer steel tube was thicker than the inner one (thick-thin) and the concrete of the outer ring had a compressive strength of 60–64 MPa. In spite of this, experimental results were compared with predictions given by Eurocode 4 Part 1-1 [6]
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کلمات کلیدی:
Circular concrete-filled dual steel columns with ... - Wiley Online Library onlinelibrary.wiley.com/doi/10.1002/stco.201610038/pdf by ML Romero - 2016 - Related articles which the buckling resistance of 12 concrete-filled dual steel col- umns was ascertained. ... (normal- and ultrahigh-strength concrete) and the ratio between. Publication: Ultra-High Strength Concrete Filled Composite Columns ... https://www.researchgate.net/.../275459843_Ultra-High_Strength_Concrete_Filled_Com... Ultra-High Strength Concrete Filled Composite Columns for Multi-Storey Building ... Nonlinear analysis of circular high strength concrete-filled stainless steel ... Circular concrete-filled dual steel columns with ultrahigh-strength ... https://www.researchgate.net/.../310470274_Circular_concrete-filled_dual_steel_column... This paper presents the results of an experimental campaign in which the buckling resistance of 12 concrete-filled dual steel columns was ascertained. Whereas ... Ultra-High Strength Concrete Filled Composite Columns for Multi ... journals.sagepub.com/doi/abs/10.1260/1369-4332.15.9.1487 by JYR Liew - 2012 - Cited by 20 - Related articles A test programme was carried out to investigate the performance of 27 axially loaded column specimens, including 18 steel tubes infilled with ultra-high strength ... Experimental Behavior of Concrete-Filled Steel Tube Columns Using ... ascelibrary.org/doi/abs/10.1061/(ASCE)ST.1943-541X.0001513 by KA Skalomenos - 2016 - Cited by 1 - Related articles Concrete-filled steel tube (CFT) columns offer significant advantages over ... investigation was conducted into CFT columns using ultrahigh-strength steel. ... square and circular specimens made with high-strength and conventional steel were ... Circular double-tube concrete-filled tubular columns with ultra-high ... www.crcnetbase.com/doi/abs/10.1201/b18410-14 Circular double-tube concrete-filled tubular columns with ultra-high strength concrete. M. L. Romero , A. Espinós , A. Hospitaler , J. M. Portolés , and C. Ibañez. [PDF]NUMERICAL SIMULATION OF ULTRA- STRENGTH CONCRETE ... hrcak.srce.hr/file/163756 by Z Yang - 2013 - Cited by 4 - Related articles and with 121mm circular hollow stub columns with ... hollow steel section, the concrete filled steel tube ... behavior of the ultra-high strength concrete-filled. The Experimental Studies on Behavior of Ultrahigh-Performance ... https://www.hindawi.com/journals/amse/2015/201289/ by Z Deng - 2015 - Cited by 5 - Related articles Feb 23, 2015 - Abstract. This paper conducts axial compression test of ultrahigh performance concrete- (UHPC-) filled hybrid FRP (HFRP) tubes, using the ...
