Non-Tensioned Steel in Prestressed Concrete Beams

Shaikh, A. Fattah; Branson, Dan E.

doi:10.15554/pcij.02011970.14.36

Cited by 20 publications

(8 citation statements)

References 8 publications

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“…Shaikh and Branson [7] showed that the I e method can be used to compute deflections of partially prestressed beams loaded above the cracking load. For this case, the cracking moment must take into account the effect of prestress.…”

Section: Deflection Constraintsmentioning

confidence: 99%

Optimum Design of Partially Prestressed Concrete Beams

2017

IJSR

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Abstract:The research presents a formulation for optimum design of partially prestressed concrete beams based on elastic analysis.The optimum design is selected to satisfy the limitations of ACI-Code 2014. The objective function is the cost of the beam. The design variables are the cross-sectional dimensions, the area of strands, and the additional ordinary reinforcement area used. The constraints represent inequality limitations on stresses, ultimate strength capacity, shear, deflection, and practical considerations according to the design requirements. The optimization problem is formulated for several sections like; rectangular, symmetrical I-, T-, and unsymmetrical I-section. The formulation of the optimization problem has been made by utilizing the sequential unconstrained minimization technique (SUMT). The procedure could be used practically by structural engineers.

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Section: Deflection Constraintsmentioning

confidence: 99%

Optimum Design of Partially Prestressed Concrete Beams

2017

IJSR

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“…The simply supported prestressed concrete beam tested by Shaikh and Branson [11] was selected for the analysis using the developed computer program. This beam was loaded by central point load.…”

Section: Numerical Examples: I-shaikh and Branson Prestressed Concretmentioning

confidence: 99%

“…Geometry and loading condition for Shaikh and Branson beam[11]. Load-Deflection Curve for Shaikh and Branson beam[11].CL Fig. (6) 3-D finite element idealization Shaikh and Branson beam[11] geometry and loading condition for Lin beam [12].…”

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confidence: 99%

Embedded Formulation of Prestressed Tendon in 3d – Brick Element

Mahmood¹,

Behnam²

2010

(AREJ)

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In the present work a formulation of the reinforced bars and prestressed tendons embedded in the brick element is developed and used for the nonlinear analysis of reinforced-prestressed concrete beams. The reinforcement and prestressing bars are represented by an axial 3 nodded bar elements embedded into the 20 nodded isoparametric brick concrete element. Perfect bond is assumed between concrete and prestressing steel bars (or tendons) such that displacements and strains of the bars are assumed to be compatible with those of the concrete element. To verify the applicability of the model two prestressed beams are analyzed and the numerical results show a good agreement with the experimental one.

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“…Betono valkðnumo bei traukimosi veiksniai, jo mechaniniø rodikliø kitimas laike turi didelae átakà ilgalaike apkrova veikiamø gelþbetoniniø (be ir su iðankstiniu átempiu) konstrukcijø átempiø ir deformacijø bûviui. Eksperimentiniai [13] bei teoriniai [4] tyrimai parodë, kad ilgalaikës deformacijos dël betono valkðnumo ir traukimosi gali 34 kartus virðyti trumpalaikes deformacijas. Ilgalaikiai procesai lemia deformacijø ir átempiø persiskirstymà tarp armatûros ir betono [4,5], neutraliosios aðies padëties pokytá, o esant iðankstiniam apspaudimui armatûros iðankstiniø átempiø maþëjimà (nuostolius) [68] gelþbetoniniuose elementuose.…”

Section: áþAngaunclassified

“…Dar vienas PCI ilgalaikiø iðlinkiø (álinkiø) prognozavimo metodo [10] trûkumø yra tas, kad betono valkðniosios bei traukimosi deformacijos kiekvieno poveikio atveju ávertinamos vienu daugikliu, t. y. nëra galimybës nustatyti atskiro efekto átakos iðlinkiø (álinkiø) augimui. Turint miðriai armuotà elementà, neátemptos iðilginës armatûros átaka ilgalaikiø iðlinkiø (álinkiø) augimui dël betono valkðniøjø bei traukimosi deformacijø ávertinama A. F. Shaikh ir D. E. Branson [13] Nesupleiðëjusio ruoþo kreivis dël trumpalaikio apspaudimo jëga P bei savojo elemento svorio (ar iðoriniø apkrovø) sukelto lenkimo momento apskaièiuojamas taip: e -e ae ö = ç ÷ è ø ,…”

Section: Kiekybinës Charakteristikøunclassified

Long‐term Deformation Analysis of Non‐cracked Pc Members Using Flexural Constitutive Model and Design Methods

Zamblauskaitė

Kaklauskas

Vainiūnas

2006

Technological and Economic Development of Economy

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In this paper, an attempt has been made to extend application of the recently proposed Flexural constitutive model to long‐term deformation analysis of prestressed concrete members. The effect of non‐linear time effects of creep and shrinkage are taken into account. Effective modulus method is used for modeling of long‐term deformations. The proposed calculation technique is based on the layered approach and use of material stress and strain relationships. Curvatures and deflections prediction results were tested against experimental data of prestressed concrete beams reported in the literature.

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Non-Tensioned Steel in Prestressed Concrete Beams

Cited by 20 publications

References 8 publications

Optimum Design of Partially Prestressed Concrete Beams

Optimum Design of Partially Prestressed Concrete Beams

Embedded Formulation of Prestressed Tendon in 3d – Brick Element

Long‐term Deformation Analysis of Non‐cracked Pc Members Using Flexural Constitutive Model and Design Methods

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