A Cyclic Nonlinear Model for Concrete-Filled Tubes. I: Formulation

Hajjar, Jerome F.; Gourley, Brett C.

doi:10.1061/(asce)0733-9445(1997)123:6(736)

Cited by 61 publications

(24 citation statements)

References 17 publications

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“…The results from these experiments are 1 1.41 η =+ Φ (22) Sufficient data now exist to test the hypothesis 1 ξ = using the Sakino [21] and the O'Shea and Bridge [26,30] experimental data sets. The CFST results for the data of Sakino [21] and O'Shea and Bridge [26,30] has been analyzed with linear regression using equation (6). The results are presented in Table 9 including the Z-statistic for the null hypothesis that the various experimental results are taken from the same sample set.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…The experimental work investigates the ductility and strength properties of steel tubular columns filled with a high strength concrete core, using short and slender columns subjected to either concentric or eccentric loads. The results are compared to recent published data from the USA, Australia, and China [1][2][3][4][5][6][7][8][9][10][11][12]. The protocol for the column compression tests used both concentric and eccentric load rigs.…”

Section: Introductionmentioning

confidence: 99%

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Properties of High-Strength Concrete Filled Steel Tube Columns

Tan¹,

Nichols²

2017

MCSE

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Abstract. High Strength Concrete Filled Steel tubes (CFST) provide a common construction material in China. The purpose of this research was to determine the axial load properties for CFST subjected to concentric and eccentric loading in a series of experiments. The results show that the magnitude of experimentally measured compressive strength increases for the core concrete, due to the confinement from the steel that is proportional to the ratio of the area of steel to the area of concrete. If the slenderness ratio is kept constant the columns bearing capacity and maximum strain decreases as the eccentricity to radius ratio increases. Formulas to estimate the load bearing capacity for short and for slender eccentrically loaded columns were established from the data. The results have been compared statistically to other published results to show that a general linear form of the capacity equation is warranted for High Strength Concrete Filled Steel tubes. Keywords:Concrete filled steel tubes, high strength concrete, bridge construction. IntroductionThe purpose of this research is to experimentally investigate the properties of concrete filled steel tubes (CFST) using a high strength concrete core. The experimental work investigates the ductility and strength properties of steel tubular columns filled with a high strength concrete core, using short and slender columns subjected to either concentric or eccentric loads. The results are compared to recent published data from the USA, Australia, and China [1][2][3][4][5][6][7][8][9][10][11][12]. The protocol for the column compression tests used both concentric and eccentric load rigs. The columns used in the experiments have length to diameter ratios ranging from 3.5 to 15. This paper outlines the literature relevant to this work, provides a methods section, outlines and summarizes the results and the key findings, and provides a conclusion. Literature ReviewCFST column types have been used in recent high-rise structures in China [13][14][15][16][17][18][19][20][21][22]. CFST structures are emerging as an important structural system for new buildings, particularly for providing earthquake resistance. Steel tubular columns filled with normal strength concrete (NSC) have been studied using slender and eccentrically loaded units [23,24], and based on these studies; a design code has been established for Chinese use [25]. A sketch of a typical CFST building connection showing a column and beam connection is drawn in Figure 1. This sketch provides the definitions of the steel wall thickness, diameter of the steel tube and the area of the concrete core of the composite tube. The schematic format of the connection detail shown in Figure 1 comes from a recent Chinese building. The connection detail has been simplified by reducing the number of bolt holes and stiffener plates. The steel plate for the beam connection transfers the load to the steel tube, which relies on the concrete to provide buckling restraint and increased strength for the given cross-sectional area.An ea...

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Section: Analysis Of the Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Properties of High-Strength Concrete Filled Steel Tube Columns

Tan¹,

Nichols²

2017

MCSE

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“…Then, displacement history according to Hajjar and Goerley (1997) was applied to model the condition of cyclic loading, as shown in Fig. 16.…”

Section: Numerical Results Of Srcft Specimens Under Lateral Cyclic Lomentioning

confidence: 99%

Evaluation of Egyptian code provisions for seismic design of moment-resisting-frame multi-story buildings

Raheem

2013

Int J Adv Struct Eng

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SRCFT columns are formed by inserting a steel section into a concrete-filled steel tube. These types of columns are named steel-reinforced concrete-filled steel tubular (SRCFT) columns. The current study aims at investigating the various types of reinforcing steel section to improve the strength and hysteresis behavior of SRCFT columns under axial and lateral cyclic loading. To attain this objective, a numerical study has been conducted on a series of composite columns. First, FEM procedure has been verified by the use of available experimental studies. Next, eight composite columns having different types of cross sections were analyzed. For comparison purpose, the base model was a CFT column used as a benchmark specimen. Nevertheless, the other specimens were SRCFT types. The results indicate that reinforcement of a CFT column through this method leads to enhancement in load-carrying capacity, enhancement in lateral drift ratio, ductility, preventing of local buckling in steel shell, and enhancement in energy absorption capacity. Under cyclic displacement history, it was observed that the use of cross-shaped reinforcing steel section causes a higher level of energy dissipation and the moment of inertia of the reinforcing steel sections was found to be the most significant parameter affecting the hysteresis behavior of SRCFT columns.

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“…La formulación simplificada de EN1994 es válida siempre y cuando los elementos a verificar cumplan ciertas proporciones geométrico/ mecánicas. Por una parte, la esbeltez adimensional debe cumplir λ≤2,0 y la cuantía de acero debe estar comprendida entre ciertos límites, ver expresión [20], donde A a es el área de acero, f yd es el valor de cálculo del límite elástico del acero del acero y N pl,Rd el axil resistente de cálculo de la sección, el cual para una sección mixta en ausencia de armaduras viene dado por la ecuación [21]. [20] [21]…”

Section: En 1994-1-1 (1) Estructuras Mixtas Hormigón-acerounclassified