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Behavior of slender steel concrete composite columns in eccentric loading

Journal of Shanghai University(English Edition) 2009年第6期13卷 481-488页

作者：起根田张孟喜李永和 School of Architecture and Civil Engineering Inner Mongolia University of Science and Technology Department of Civil Engineering Shanghai University

Ten slender steel reinforced cencrete （SRC） composite columns are tested under eccentric loading conditions. Effects of concrete strength, slenderness of columns and eccentricity of the axial load are studied. The load-carrying capacity is reduced with increased slenderness ratio and eccentricity. Concrete strength has no obvious influence on eccentrically loaded columns. Then, a nonlinear numerical method of pin-ended slender columns is also presented. This method is applicable for determining the material failure load or buckling failure load of a slender steel reinforced concrete composite column. In this method both material and geometric nonlinearities are taken into account. The results of numerical analysis accord well with the test results. The test results are also compared with the results predicted by ACI318-05 and the China Specifications.

关键词： steel concrete composite column behavior nonlinear analysis

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Bearing capacity of composite columns reinforced by concrete filled steel tube

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Journal of Chongqing University 2013年第1期12卷 27-34页

作者：韦建刚 ZHU Pu CHEN Bao-chun College of Civil Engineering Fuzhou University

In this study, nine simplified short composite columns consisting of core CFST (concrete filled steel tube) of different diameters and outer reinforced concrete were constructed to study their compressive performance under axial or eccentric compression. The failure mode is characterized by the crush of the outer concrete. The bearing capacity increases at first and then decreases with further increase of the position coefficient. It can be concluded that position coefficient is an important structural parameter that has considerable influences on the ultimate bearing capacity of the composite columns. The outer concrete, steel tubes and longitudinal reinforcement are found to work in a cooperative manner under axial or eccentric compression when the position coefficient is about 0.5. An improved bearing capacity algorithm that takes the position coefficient into account has been proposed based on the experimental and simulation results and current technical specification in China. It has been proven to be precise and safe.

关键词： concrete filled steel tube composite column position factor test formula

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EXPERIMENTAL STUDY ON THE COMPRESSIVE STRENGTH OF CONCRETE FILLED CFRP-STEEL columnS

EXPERIMENTAL STUDY ON THE COMPRESSIVE STRENGTH OF CONCRETE F...

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The Sixth China-Japan-US Joint Conference on composite Materials

作者： Ying Hua Zhao, Wei Gu, Qing Li Wang(Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, China College of Civil Engineering, Shenyang Architecture University, Shenyang 110015, China)

＜正＞Concrete filled steel tubes offer so many benefits as the compressed columns in structures compared with rein-forced concrete columns that they get broader usage in civil engineering recently. As a new composite column, with even more competitive properties, the concrete filled CFRP-steel tube is introduced in this paper. For the study of its mechani-cal behavior, an experimental investigation is developed on 15 specimens of this kind and the test results are discussed in detail. It is found that CFRP puts off the yield point of the steel tube and enhances effectively the compressive load carry-ing capacity of the column. The experimental results suggest that the proposed new column is an ideal compression carry-ing part in the structure with multiple advantages such as the relatively small cross section area versus the increasing ulti-mate loading.

关键词： concrete filled CFRP-steel tube composite column reinforced concrete ultimate loading

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Study of Concrete Filled Unplasticized Poly-Vinyl Chloride Tubes as columns under Axial Loading

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Journal of Mechanical Materials and Mechanics Research 2022年第1期5卷 10-17页

作者： Manish Sharma Md.Imteyaz Ansari Nazrul Islam Department of Civil Engineering Faculty of Engineering and TechnologyJamia Millia IslamiaNew Delhi110025India

This article aims to examine the behavior of Unplasticized Poly-Vinyl-Chloride(UPVC)bounded reinforced columns with polypropylene fibers under axial *** develop this model,samples of concrete filled UPVC pipe(CFUT)with different geometric properties were *** obtain the specimens different class pipes with three different diameters were used to investigate the sensitivity of these columns to various *** effect of each variable on the ultimate strength,ductility and confinement efficiency of the samples was *** specimens were compressed by applying load only to the concrete core to obtain the load-displacement variations and the corresponding deformation mode.A finite element model was developed using the proposed stress-strain variation of confined concrete with UPVC tubes to simulate axial compression of CFUT *** to the results obtained,the effect of the change in diameter-thickness ratio failure stress of concrete limited by(D/t)is obtained and discussed with empirical *** fibers were found to slightly increase column strength up to a certain volume fraction,after which the strength generally experienced a decrease.

关键词： Unplasticized Poly-Vinyl Chloride(UPVC)tubes composite column Tube confinement column strength

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