Algebraic Methods for  Creep Analysis of Continuous Composite Beams

Dezi, Luigino; Leoni, Graziano; Tarantino, Angelo Marcello

doi:10.1061/(asce)0733-9445(1996)122:4(423)

Cited by 52 publications

(33 citation statements)

References 8 publications

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“…The steel joist and the reinforcement of the concrete slab have been assumed to behave in a linear-elastic manner, while the concrete behaviour has been assumed to be time-dependent and it has been modelled using the age-adjusted effective modulus method (AEMM) and the mean stress (MS) method as Dezi et al [24,25] identified these two material models to be accurate algebraic representations of the rheologic behaviour of the concrete. The concrete behaviour is assumed to be identical in both compression and tension, as recommended in [4,26] for the stress levels in compression and tension less than about one-half of the compressive and tensile concrete strength, respectively; for higher stresses, which are more likely to occur when shrinkage effects are considered in combination with creep effects, other material non-linearities such as cracking and tension stiffening should be accounted for.…”

Section: Discussionmentioning

confidence: 99%

“…The time-dependent behaviour of the concrete is assumed to be modelled by means of the AEMM and the MS methods. In fact, based on an extensive numerical parametric study, Dezi et al [24,25] recommended the use of the AEMM method for composite beams subjected to external loadings and the use of the MS method when subjected to shrinkage effects. It is also assumed that its behaviour is identical in both compression and tension, as recommended by Gilbert [4] for the stress levels in compression less than about one-half of the compressive strength of the concrete, and for tensile stresses less than about one-half of the tensile strength of the concrete, and the results obtained using this approach are assumed to be acceptable from a quantitative and qualitative viewpoint when the calculated stresses remain in this stress range as stated in [4,26].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…In all the examples proposed, the time-dependent behaviour of the concrete is modelled by means of the AEMM when the beam is subjected to a uniformly distributed load and by means of the MS method when subjected to shrinkage effects as recommended by Dezi et al [24,25]; the creep and shrinkage properties are calculated in accordance with [28].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of composite beams with partial interaction using the direct stiffness approach accounting for time effects

Ranzi

Bradford

2008

Numerical Meth Engineering

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SUMMARYThis paper presents a modelling technique based on the direct stiffness method (DSM) to describe the behaviour in time of composite beams with partial shear interaction accounting for creep and shrinkage of the slab. The time-dependent behaviour of the concrete is modelled using algebraic representations, such as the age-adjusted effective modulus method and the mean stress method, while the steel joist, the reinforcement and the shear connection are assumed to behave in a linear-elastic manner. Only one discretization (i.e. in the time domain) is required by the proposed stiffness formulations to perform a time analysis, while two discretizations (i.e. one in the time domain and the other in the spatial domain along the beam axis) are required by other modelling techniques available in the literature. The ability of the derived elements to overcome curvature locking problems observed to occur in some conventional displacement formulations is also highlighted. The proposed DSM approach is then validated against analytical solutions derived by the authors for simple structural systems. The applicability of this method for the time analysis of continuous composite beams is also illustrated.

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Section: Discussionmentioning

confidence: 99%

Section: Materials Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of composite beams with partial interaction using the direct stiffness approach accounting for time effects

Ranzi

Bradford

2008

Numerical Meth Engineering

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“…Simplified effective modulus and mean stress methods are used in practical creep calculations. The socalled age adjusted effective modulus method (AAEM) developed by Z. P. Bazant [I] is compared in [12] with these two above-mentioned; AAEM is recommended for deflection calculations. The AAEM method is applied to creep stability analysis of concretefilled steel columns [13].…”

Section: Non-linear Deformation and Stability Of Reinforced Concrete mentioning

confidence: 99%

Non-Linear Deformation and Stability of Reinforced Concrete Column Under the Long-Time Load

Cypinas

1999

Statyba

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“…Their 13 approach was to triple the modulus ratio of steel to concrete which was used to determine the sectional properties of the corresponding transformed section. Dezi et al (1995Dezi et al ( , 1996 conducted a more elaborated research focused on the effect of concrete creep on continuous composite steel beams with prestressed slabs. Their analysis was based on the theory of linear viscoelasticity (used to describe the material behavior of concrete) and a step-by-step numerical integration procedure.…”

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confidence: 99%

Examination of Post-Tensioned Steel Bridges in Indiana

Wu¹,

Bowman²

2000

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Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractThe purpose of the research study is to conduct an investigation to understand the performance of a relatively new type of bridge construction that involves prestressed (post-tensioned) steel-concrete composite bridge members. Strictly speaking, the technical and economical advantages of this type of structure have been understood for several decades. However, the application of this concept to practice is still very limited due to difficulties associated with the post-tensioning anchorage. The study was thus intended to explore the mechanical behavior of such construction. Both the short-term and long-term bridge performance were evaluated in this study.The investigation included experimental as well as analytical evaluations of the structural behavior. The experimental part involved a series of field measurements of a newly constructed steel-concrete composite bridge which was post-tensioned with high-strength steel tendons. This bridge, which is part of the I-90 Indiana Toll Road, is located in Elkhart County, Indiana. Strain distributions in the composite girders and the elongation of a selected post-tensioning tendon were measured at certain crucial phases of construction. The field monitoring was periodically conducted over a period of about one year after the post-tensioning operation. Analytical solutions were developed to evaluate the structural response due to various types of instantaneous loads, temperature effects and time-dependent factors. The validity and effectiveness of the analytical model were examined by comparing the calculated results with the data collected from the field. Further prediction of the long-term structural response was also performed based on the proposed methodology. A cost comparison for the structural components between the Elkhart post-tensioned bridge and a nearby conventional steel bridge was also conducted. Key Wordspost-tensioning, tendon, creep, shrinkage, relaxation, prestress losses, transformed section Besides possible economic advantages and increasing the load-carrying capacity, the use of post-tensioning in steel-concrete composite bridge structures also offers several benefits:(1) The range of elastic behavior is expanded. The expansion of elastic material behavior eventually results in a procrastination or even elimination of the occurrence of plastic deformation.(2) The deformation due to service loading is reduced. Analysis was performed to estimate the overall structure response, and the results were compared to the experimental data. The validity and effectiveness of the analytical model were examined by comparing the calculated results with the data collected from the field.Several important observations from the experimental and analytical investigation are summarized as below:(1) The experimental measurements confirmed the presence of compressive stresses throughout the deck shortly after post-tensioning. The bridge deck may be subjected...

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Algebraic Methods for Creep Analysis of Continuous Composite Beams

Cited by 52 publications

References 8 publications

Analysis of composite beams with partial interaction using the direct stiffness approach accounting for time effects

Analysis of composite beams with partial interaction using the direct stiffness approach accounting for time effects

Non-Linear Deformation and Stability of Reinforced Concrete Column Under the Long-Time Load

Examination of Post-Tensioned Steel Bridges in Indiana

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