This study experimentally explores the behaviour of recycled aggregate concretefilled steel tubes racfst subjected to axial compression loading. In current international practice, cft columns are used in the primary lateral resistance systems of both braced and unbraced building structures. Mechanics behavior of axially loaded short columns with concrete filled square steel tube. This study aimed to investigate the static performance of notched hexagonal concretefilled steel tube cfst stub columns through axial loading. The total 14 specimens are tested under the axial load, and. This study divided the steel tube into 16 longitudinal fiber elements, and specified 17 longitudinal material integration points for the core concrete. Behavior of concrete filled steel tube column ijedr1401056 international journal of engineering development and research. Hajjar 4 abstract this paper presents selected experimental results on 18 tests on circular and rectangular concretefilled steel tubes cft subjected to cyclic loads. Nonlinear analysis of axially loaded circular concrete.
Parametric study of concrete filled steel tube column. Theoretical analysis on mechanical behavior of axially. Behavior of axially loaded stirrup confinement rectangular concretefilled steel tubular stub columns jing liu,1,2 wenjun wang,1 faxing ding,1 xinfa zeng,2 zhe tan,2 yan huang,2 and baoquan wang2 1schoolofcivilengineering,centralsouthuniversity,changsha,hunanprovince410075,china. The results of 62 concentrically loaded scale model columns filled with high strength concrete 46100 mp a are presented. Fire behavior of axially loaded slender high strength. Parametric study of concrete filled steel tube column darshika k. Finite element modelling for axially loaded concretefilled. Pdf axial load behavior of stiffened concretefilled steel columns. Typically, it was used in composite frame structures. Pdf axial load behaviour of concretefilled steel tubular. A numerical model for considering the bondslip effect in. Lai department of civil engineering, the university of hong kong, hong kong.
Experimental and numerical behaviour of eccentrically. Experimental behaviour of recycled aggregate concrete. This study experimentally investigated the behaviour of concretefilled steel tubes under cyclic axial compression. Based on the mechanical model, a novel numerical program is developed. Pdf analysis of axially loaded concrete filled circular hollow. Behavior of axially loaded stirrup confinement rectangular concrete filled steel tubular stub columns jing liu,1,2 wenjun wang,1 faxing ding,1 xinfa zeng,2 zhe tan,2 yan huang,2 and baoquan wang2 1schoolofcivilengineering,centralsouthuniversity,changsha,hunanprovince410075,china. Performance of concrete filled steel tubular columns. For comparison purpose, tests were also performed on 12 normal concretefilled steel tube ncfst specimens, three steel tubes and one specimen of recycled aggregate concrete.
Rizkalla department of civil engineering, north carolina state university, raleigh, nc 276957533. Buckling of slender concretefilled steel tubes with. Comparative study of concrete filled steel tube columns. Request pdf finite element modelling for axially loaded concretefilled steel circular tubes this study presents a finite element analysis modelling fea for concretefilled steel circular. School of architectural engineering, changan university, xian 710061, shaanxi, china. This is due to their excellent structural properties, such as earthquake resistance, high strength and ductility, and large energy. Nonlinear analysis of axially loaded cicular concretefilled stainless steel tubular short columns abstract the experiments indicate that stainless steels in tension deform plastically more than stainless steels in compression. It is impossible to fully use the existing research results of axially loaded short columns with common reinforced concrete.
Analysis and design of axially loaded short concrete filled steel tubes. Comparative study of concrete filled steel tube columns under axial compression. Fire resistance of axially loaded concrete filled steel. Structural performance of axially loaded concretefilled steel tubes with different concrete mixes. The use of concrete filled steel tubes in building construction has seen resurgencein recent years due mainly to its simple construction sequence, apart from its superiorstructural performance. Theoretical analysis on mechanical behavior of axially loaded. Deflection calculation based on sdof method for axially. Nonlinear analysis of axially loaded concretefilled tube columns with confinement effect, in j. Behavior of axially loaded concretefilled circular frp tubes amir z. Based on numerical simulation and theoretical analysis, the impact response and deflection calculation method for axially loaded cfst members subjected to lateral impact are investigated in this paper. However, section discretization is a prerequisite for fiber element modeling patel et al. Fire resistance of axially loaded concrete filled steel tube.
Nonlinear analysis of axially loaded circular concretefilled. Uniaxial compression test of concretefilledsteeltube. Fourteen specimens were tested to investigate the effect of the steel tube shape and wall thickness on the ultimate strength of the composite column. This study presents a finite element analysis modelling fea for concretefilled steel circular tubes cfsct subjected to axial compressive load using the commercial fea software abaqus. Concretefilled steel tubular columns have excellent earthquake resistant properties such as high strength and ductility and large energy absorption capacity. For concretefilled steel tubes cfst, local buckling commonly observed in bare steel columns is effectively prevented, giving a higher capacity. These members are ideally suited for all applications because of their effective usage of construction materials. Concretefilledsteeltube cfst columns have been adopted due to its. A total of 42 concretefilled steel tube specimens of. Concretefilled steel tubes are very popular in structural engineering applications. Finite element modelling for axially loaded concrete. Read behaviors of axially loaded circular concretefilled steel tube cft stub columns with notch in steel tubes, thinwalled structures on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Nonlinear analysis of axially loaded cicular concrete filled stainless steel tubular short columns abstract the experiments indicate that stainless steels in tension deform plastically more than stainless steels in compression.
However if the concrete core and the steel tube are loaded simultaneously the steel. View enhanced pdf access article on wiley online library html view. There are changes in material properties of concrete when compared axially loaded short columns with microexpansive concrete filled steel tube with axially loaded short columns with common reinforced concrete and these changes will inevitably lead to the change of axially loaded short columns with microexpansive concrete filled steel tube in performance. Concrete filled steel tubes cfst are composite structures of steel tube and in filled concrete. The concrete core gives thegreater contribution to resisting axial compression. To compare the experimental results of cfst with aisclrfd 2005 and eurocode4.
Behaviors of axially loaded circular concretefilled steel. Axial force has a great influence on the dynamic behavior and the impact resistance of concretefilled steel tubular cfst members. Axial compressive behaviour of slender cfst membersanalytical. Concretefilled steel tubular cfst support has been gradually applied in. Experimental study on working performance of axially loaded. For comparison purpose, tests were also performed on 12 normal concrete filled steel tube ncfst specimens, three steel tubes and one specimen of recycled aggregate concrete.
Behavior of axially loaded concrete filled circular frp tubes amir z. Comparison of the square and circular columns in the fire resistance shows that, for columns with the same steel and concrete crosssection areas, the circular column. This study experimentally explores the behaviour of recycled aggregate concrete filled steel tubes racfst subjected to axial compression loading. Pdf axial compressive strength of short concrete filled steel tubes, cft, is at least equal to the sum of the strengths of its components. The fire resistance of this kind of composite tubes is calculated. Nevertheless, in real situations, imperfect interface compliance between the concrete core and the steel tube is observed especially when high axial loads are. Experimental and analytical analysis of concrete filled. Axial load capacity of circular steel tube columns filled with high strength concrete supervised by. Concrete filled steel tubes subjected to axial compression and. Concretefilled steel tubes cfst are composite structures of steel tube and infilled concrete. Simplified numerical modeling of axially loaded circular. For concrete filled steel tubes cfst, local buckling commonly observed in bare steel columns is effectively prevented, giving a higher capacity. Twentyfour racfst specimens were tested to failure. Li xiaowei 1, 2, zhao junhai 1, zhu tiedong 1, wang liang 1.
Loadcarrying capacity of axially loaded concretefilled steel tubular columns made of thin tubes article pdf available in archives of civil and mechanical engineering 183 february 2018. Behavior of axially loaded stirrup confinement rectangular. Concretefilled steel tubular cfts columns subjected to eccentric compressive load. Interaction strength of concretefilled steel tubes tiziano perea 1, roberto t. Concretefilled steel tube cfst structural members have been. Fire behavior of axially loaded slender high strength concretefilled tubular columns manuel l. A vertical compression axial loading was simultaneously applied to. Experimental investigation on the axially loaded performance of. Behavior of centrally loaded concretefilled steeltube short column. Pdf performance of concrete filled steel tubular columns.
Buckling, composite column, steel tubes, concretefilled. The influence of confinement on axial load capacity is estimated from the results of axial compression tests conducted on twelve cold formed steel circular columns of length to diameter ratio equal to 3 and diameter to. The experimental results are also compared to the loads allowed by the nbc and aci and recommendations made. A cfsst column has gained prominence from structural engineers all over the world as it providessufficient strength and durability to withstand compressive loads. Concretefilled steel tubes subjected to axial compression. The model is derived from the theory of elastoplasticity, nonlinear elastic mechanics and materials properties. Concrete filled stainless steel tube cfsst is a composite structure that comprises both the structural steel andcore concrete. Axially loaded concretefilled steel tubes journal of. Out of the three bonded tubes, one was axially loaded on the composite section, c1, and two were axially loaded on the concrete core only, c2 and c3. Recent advancements in the availability of higher strength steels, better coating materials for protection and high strengthsperformance concretes have expanded the scope of concrete filled steel composite columns with wide ranging applications in various structural systems with ease of construction, highly increased strengths and better performance. Concrete filled steel tube an overview sciencedirect topics. All cfst specimens were made 2500 mm long and the steel tubes were either 2. Pdf analysis and design of axially loaded short concrete.
This article presents the experimental and finite element fe analyses of two conventional rectangular concrete filled steel tubular cft stub columns, two stiffened rectangular concrete filled steel tubular scft stub columns, and two stirrup confinement rectangular concrete filled steel tubular ccft stub columns concentrically loaded in compression to failure. Behaviors of axially loaded square concretefilled steel. Mar 03, 2016 in order to study the mechanical mechanism of concrete filled steel tubes cfsts under axial compression, a theoretical model for analysing the behaviour of axially loaded cfst columns is presente. Three dimensional confinement effect of concrete along with support provided by concrete to the thin walls of steel tube to prevent local buckling had a composite effect on the strength of the. Axial behaviour of concrete filled steel tube stub. Concretefilled steel tubular cfts columns subjected to. Nonlinear analysis of axially loaded cicular concrete. Structural performance of frames with concretefilled steel tubular.
Therefore, the strain hardening of stainless steels in compression is much faster than that of stainless steels in. Huang yijie 1,2, sun yuedong 1, sun huangsheng 1,2. In order to study the mechanical mechanism of concretefilled steel tubes cfsts under axial compression, a theoretical model for analysing the behaviour of axially loaded cfst columns is presented in this paper. Axial and lateral stressstrain model for circular concretefilled steel tubes. Buckling of slender concretefilled steel tubes with compliant. Composite columns such as concretefilled steel tube cfst were adopted in.
Oct 11, 2019 this study presents a finite element analysis modelling fea for concrete filled steel circular tubes cfsct subjected to axial compressive load using the commercial fea software abaqus. Simplified numerical modeling of axially loaded circular concretefilled steel stub columns article pdf available in journal of structural engineering 14312 december 2017 with 915 reads. School of civil engineering and architecture, shandong university of science and technology, qingdao 266590, shandong, china. Behaviour of concrete filledsteel tubes under axial load. Jul 01, 2006 the behaviour of axially loaded square and circular concrete filled steel tube cfst columns when exposed to elevated temperatures is investigated in this paper. Axial load behaviour of concrete filled steel tubular columns. Dec 01, 20 read behaviors of axially loaded circular concrete filled steel tube cft stub columns with notch in steel tubes, thinwalled structures on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Structural performance of axially loaded concretefilled. Mechanical properties of new concretefilled steel tubular. An innovative selfcentering connection for circular concrete filled steel tubes.
Behavior of axially loaded concretefilled circular frp tubes. Concrete steel composite structures are very efficient in carrying high loads as they combine benefits of both materials concrete and steel. Cfst members, slender, compression, local buckling, axially loaded. Mar 03, 2016 in order to study the mechanical mechanism of concrete filled steel tubes cfsts under axial compression, a theoretical model for analysing the behaviour of axially loaded cfst columns is presented in this paper. Pdf loadcarrying capacity of axially loaded concrete. Studies on mechanical properties of stub columns of axial. This paper presents an experimental and analytical study on the behavior of short, concrete filled steel tube columns concentrically loaded in compression to failure. An extensive experimental program was initiated to examine the axial capacity of cfsthsc columns. Research article theoretical analysis on mechanical. The present study is an investigation of the behavior of circular and square concrete filled steel tubes cfst subjected to. The confinement offered by steel tubes in concrete filled steel tubular cft columns is found to be crucial in the enhancement of structural properties of such columns. A new mechanical model for analysing the behaviour of axially loaded recycled aggregate concrete filled steel tubes racfsts stub columns is presented in this study. This experimental study is carried out on the behavior of short, concrete filled steel tubular columns axially loaded in compression to failure.
Mechanics behavior of axially loaded short columns with. Experimental behaviour of concretefilled steel tubes under. Studies on mechanical properties of stub columns of axial compression concrete filled circular steel tubes based on new mechanical analysis program. Concretefilled steel tubes cfts are composite members consisting of an steel tube infilled with concrete. Concretefilled steel tubes subjected to axial compression and lateral cyclic loads amir fam1, frank s. Pdf simplified numerical modeling of axially loaded. This article introduces a numerical model that simulates the bondslip behaviour in axially loaded circular concretefilled tube columns without applying double nodes required in the use of the classical bondlink element. Load testing machine was used for applying the load on the specimens. Experimental behaviour of recycled aggregate concretefilled. Comparison of the square and circular columns in the fire resistance shows that, for columns with the same steel and concrete crosssection areas, the circular.
Developed more than 80 years ago, the design procedure of concrete filled steel tubes cfst has several limitations that can still be found in most current international design standards. This paper presents an experimental and analytical study on the behavior of short, concretefilled steel tube columns concentrically loaded in compression to failure. For that the specimens were axially loaded upto the failure of each specimen. Describes a theoretical and experimental investigation into the behavior of concrete filled steel tubes as axially loaded compression members. Behaviors of axially loaded square concretefilled steel tube cfst stub columns with notch in steel tube. Influence of concrete confinement on axial load capacity. A total of 42 concrete filled steel tube specimens of two groups were tested to f. Experimental behaviour of concretefilled steel tubes. Concrete filled steel tube an overview sciencedirect. This article presents the experimental and finite element fe analyses of two conventional rectangular concretefilled steel tubular cft stub columns, two stiffened rectangular concretefilled steel tubular scft stub columns, and two stirrup confinement rectangular concretefilled steel tubular ccft stub columns concentrically loaded in compression to failure. Axial load behaviour of concretefilled steel tubular columns. Concrete filled steel tubes cfts are composite members consisting of an steel tube infilled with concrete.
Recent advancements in the availability of higher strength steels, better coating materials for protection and high strengthsperformance concretes have expanded the scope of concrete filled steel composite columns with wide ranging applications in. Cfst columns can sustain large axial loads especially when used in highrise. Influence of concrete confinement on axial load capacity of. Schneider 2 performs a comprehensive study about axially loaded concrete filled steel tubes. Research article theoretical analysis on mechanical behavior. Mechanics behavior of axially loaded short columns with concretefilled square steel tube. Finite element modelling for axially loaded concrete filled steel circular tubes springerlink. Use of stainless steel in place of mild steel providesthe desired fire and corrosion resistance, as well. This study experimentally investigated the behaviour of concrete filled steel tubes under cyclic axial compression. The model is derived from the typical elastoplasticity, the nonlinear elastic mechanics, and the properties of materials. Different parameters such as the ratio of the axial load, the. Calculating the strength of concrete filled steel tube columns of.
Wang and kodur 2 recommended the use of such typology of columns in order to avoid. The behaviour of axially loaded square and circular concretefilled steel tube cfst columns when exposed to elevated temperatures is investigated in this paper. The combination of them can significantly improve the strength of the composite structure by taking advantage of high compression resistance of concrete and high strength of steel in tension. Rizkalla department of civil engineering, north carolina state university, raleigh, nc 276957533 abstract this paper describes the behavior of concrete filled gla s fiber reinforced polymer gfrp tubes, under axial compression loading conditions. Experimental study on working performance of axially. Liua new calculation method for axial load capacity of separated concretefilled steel tubes based on limit. In 1967, furlong reported that if the steel tube is axially loaded, the confinement effect is. Nonlinear analysis of axially loaded cicular concretefilled. Behaviors of axially loaded square concretefilled steel tube. The influence of confinement on axial load capacity is estimated from the results of axial compression tests conducted on twelve cold formed steel circular columns of length to diameter ratio equal to 3 and diameter to thickness ratio ranging from 33 to 63.
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