Creep modeling for concrete-filled steel tubes

The state of the art of creep of Concrete Filled Steel Tubular (CFST) arch bridges including CFST members is presented in this paper. It is delineated that researches on creep of CFST is not mature and need much study compare to creep of plain concrete and reinforced concrete. In comparison with the plain concrete members, creep magnitude in CFST is relatively low but, the duration is longer. Creep has much influence on the deformation, stress redistribution between steel tube and core concrete and to reduce the buckling strength of CFST arches; how to implement the research results on actual arch bridge design is necessary part of research in pending. A good creep prediction model is the urgent essence of today's design works with CFST element.

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“…The creep coefficient calculated by the model was lower than ACI, but higher than that acquired by Terry's test (Naguib and Mirmiran, 2003).…”

Section: Researches On Creep Of Cfst Membercontrasting

confidence: 56%

State of the art of creep of concrete filled steel tubular arches

Shrestha

Chen

2010

KSCE J Civ Eng

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show abstract

“…Following the framework proposed by Naguib and Mirmiran [16], we establish hereinafter a predictive model with all aforementioned effects considered for the efficient assessment of creep deformation of CFST columns at any designated target time. However, and in contrast to the previously proposed framework [16], the creep strain of CFST columns at any target time can be conveniently obtained through a simplified design method without repeating the complicated iterative algorithm for each loading increment of the whole duration. In other words, only one iterative process is needed for predicting the final status of creep.…”

Section: Creep Analysis Of Cfst Columnsmentioning

confidence: 99%

“…In other words, only one iterative process is needed for predicting the final status of creep. Another novel contribution of our model is that a monolithic iterative scheme is developed instead of the staggered one used in [16] to achieve better convergence of creep iterations.…”

Section: Creep Analysis Of Cfst Columnsmentioning

confidence: 99%

“…(6) and (9), we then get the radial stain e cr ðt 0 Þ of the concrete core and the hoop strain e sh ðt 0 Þ of the steel tube. In line with the framework presented by [16], the steel tube is assumed to be in a plane stress state and moreover to behave elastically under long-term service load. Thus its constitutive relations are given by…”

Section: Short-term Elastic Analysis Of Cfst Columnsmentioning

confidence: 99%

“…A few investigations, including both theoretical and experimental ones, were carried out in order to study the creep and shrinkage behavior of CFST columns, e.g. Morino et al [14], Uy [15], Naguib and Mirmiran [16], Ma and Wang [17], Gunnarsson et al [18]. It was found that shrinkage strain in CFST columns was very small or totally eliminated due to the prevention of moisture egress in a sealed environment [19,20].…”

Section: Introductionmentioning

confidence: 99%

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