Effect of End Blocks on Anchorage Zone Stresses in Prestressed Concrete Girders

Sarles, Dan; Itani, Rafik Y.

doi:10.15554/pcij.11011984.100.114

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…However, for fibre reinforced concrete segments, more fibres may be required to increase the flexural tensile strength. The increase in peak stress with eccentricity for low load width ratios, has also been confirmed by Sarles and Itani (1984); Gupta and Khapre (2008). However, for load width ratios (a/d) less than 0.3, the peak stresses increase as shown in Figure 12a and Figure 13 respectively.…”

Section: Effects Of Eccentricity (E/d) On Peak Stresssupporting

confidence: 56%

“…The earliest work in literature to propose an equation for the bursting force was by Morsch (1922Morsch ( ,1924. Further theoretical investigations are given in the literature by Bortsch (1935); Magnel (1949); Sievers (1952); Guyon (1953Guyon ( ,1972; Iyengar (1962); Robbins (1969,1970); Sarles and Itani (1984). Of these the works by Guyon (1953Guyon ( ,1972 and Iyengar (1962) are the ones widely used in the present day industry in the design of precast segments.…”

Section: Figure 1 Definition Of a And D Dimensions For Tunnel Boring mentioning

confidence: 99%

“…Robbins (1969, 1970) found that Poisson ratio has little effect. Sarles and Itani (1984) used the FE method to model prestressed concrete girders for the evaluation of the usefulness of end blocks. The FE model was made up of eight node three-dimensional solid elements with three degrees of freedom per nodal point.…”

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

“…Linear elastic, isotropic and homogeneous material properties were assumed. Sarles and Itani (1984) used a Poisson ratio of 0.167 (on the basis that Robbins (1969, 1970) had shown that the Poisson ratio had little effect) and a Young's modulus for concrete of 28000 MPa. One of the conclusions of Sarles and Itani (1984), was that the maximum transverse tensile stresses increase with eccentricity.…”

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

“…Sarles and Itani (1984) used a Poisson ratio of 0.167 (on the basis that Robbins (1969, 1970) had shown that the Poisson ratio had little effect) and a Young's modulus for concrete of 28000 MPa. One of the conclusions of Sarles and Itani (1984), was that the maximum transverse tensile stresses increase with eccentricity. Burdet (1990) used elastic FE analysis in his study at the University of Texas in Austin to propose design equations which were later adopted in the American Standards.…”

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

See 4 more Smart Citations

Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Boye¹,

Abbey

Ngambi

et al. 2019

Lat. Am. j. solids struct.

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In precast concrete segmental tunnels, radial and circumferential joints are often the most highly stressed parts and it is therefore important to use appropriate equations to accurately analysed these joints during design and provide adequate structural capacity to avoid failure. Different design codes have put forward equations for the estimation of bursting forces due to concentrated load on precast end blocks. The equations were specifically developed for pre-stressed concrete anchors and not specifically for precast concrete segmental tunnels. The design equations often account for the effects of load eccentricity in estimating bursting force but not the peak stress. This paper assesses the accuracy of published equations for bursting force and peak stress by conducting a high-resolution two-dimensional (2D) finite element (FE) based parametric studies. It was found that the effects of load eccentricity are significant for highly concentrated loads (load width ratios less than 0.3) and that they increase the peak bursting stresses significantly. Regression analysis is used to develop equations for estimating the peak bursting stress and bursting force due to load eccentricity for the design of precast concrete tunnel segments. These equations are more accurate as compared to pre-existing equations and important for practising engineers and designers.

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Section: Effects Of Eccentricity (E/d) On Peak Stresssupporting

confidence: 56%

Section: Figure 1 Definition Of a And D Dimensions For Tunnel Boring mentioning

confidence: 99%

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

See 3 more Smart Citations

Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Boye¹,

Abbey

Ngambi

et al. 2019

Lat. Am. j. solids struct.

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A state-of-the-art review of prestressed concrete tub girders for bridge structures

Wang

Kim

2022

J Infrastruct Preserv Resil

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This paper presents a state-of-the-art review of prestressed concrete tub girders for bridge structures, which are a resilient solution to reduce the occurrence probability of disruptive events and to extend the longevity of built-environments. Technical parameters are categorized in accordance with physical characteristics and corresponding contents are examined. Unlike the case of box girders, the open-section tub girders demand secondary structural elements to improve stability. As far as application is concerned, pre- and post-tensioning methods are taken into account with a focus on the implications of geometric variables, on-site splice, and applied forces. The applicability of existing design provisions is also evaluated in the context of live load distributions and end zone cracking. While the strand size of 12.7 mm and 15.2 mm is dominant in the United States, research has commenced on the use of 17.8 mm strands to accommodate a high level of prestressing force. The effectiveness of precast decking panels is elaborated against conventional cast-in-place decks, and the extension of overhangs is delineated.

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