Strength predictions of pile caps by a strut-and-tie model approach

Park, JungWoong ParkJ.; Kuchma, Daniel KuchmaD.; Souza, Rafael Alves de

doi:10.1139/l08-062

Cited by 29 publications

(20 citation statements)

References 5 publications

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“…In addition, it is noticed that the coefficients of variation (cv) are high, showing the complexity of the problem. Park et al [18] and [8] compared some experiments with the theoretical results of strut-and-tie models and the bending theory (slab analogy), and even with relatively high cv, the STM showed more reliable predictions. In Table 5, the statistical parameters are calculated assuming separate groups of tests by researcher.…”

Section: Comparative Studymentioning

confidence: 99%

Design of deep pile caps by strut-and-tie models

Santos

Carvalho

Stucchi

2019

Rev. IBRACON Estrut. Mater.

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There are many methods for designing pile caps, but there is still no consensus on which one provides the best approach for the practical engineers. In Brazil, many structural designers use the classical Blévot method; however, the applicability of the method has been questioned after the revision of the NBR 6118 standard for design of concrete structures in 2014. To support structural designers, a strut-and-tie model has recently been developed that relates the classical method to the most current concepts of strut-and-tie models. The theoretical bearing capacity of four-pile cap obtained through several strut-and-tie models are compared with experimental tests. The results show that this recently developed model is suitable for the design of deep pile cap.

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Section: Comparative Studymentioning

confidence: 99%

Design of deep pile caps by strut-and-tie models

Santos

Carvalho

Stucchi

2019

Rev. IBRACON Estrut. Mater.

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show abstract

“…This Bloodworth Cao & Xu 4 discrepancy has not been resolved in the Eurocodes (BSI, 2004;BSI, 2005). US and Canadian standards (AASHTO 2007;ACI 2005;CSA 1994) favour STM, but there has been uncertainty expressed about its applicability (Park et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Shear Behavior of Reinforced Concrete Pile Caps

Bloodworth

Cao²,

2012

J. Struct. Eng.

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The application of bending theory based methods and strut-and-tie models for the design of pile caps to resist shear is still a subject of debate, with the latest Eurocodes permitting both methods but not giving much guidance as to their use. The former UK design standards for concrete buildings and bridges, recently withdrawn, gave more guidance and it is likely that these methods will continue to be used by designers.However, there is considerable discrepancy between these standards, particularly with regards to the width of cap over which shear enhancement at short spans may be applied, and how much longitudinal reinforcement to take as a tie in the strut-and-tie method. Both standards are also seen as conservative.To gain a better understanding of the problem and assess the available design methods, nonlinear finite element analysis has been performed to investigate the shear behaviour of four-pile reinforced concrete pile caps, under full-width wall loading.The models were validated against an experimental programme that included an optical photogrammetric method for measuring full-field displacements. An extensive parametric study was carried out, varying shear span, cap width and reinforcement ratio over a practical range.The conservatism of the UK design standards, and the real shear capacity of the pile caps, were found to be a function of shear enhancement factor and the width of the 2 cap over which shear enhancement is applied. Strut-and-tie behaviour was observed in the models, and a commonly used strut-and-tie method was found to give fairly good predictions. A modified strut-and-tie method is suggested for this particular configuration of a four-pile cap under full-width loading, which gives more accurate predictions. This is especially so for samples with large transverse pile spacing where a significant proportion of the longitudinal reinforcement over the width of the cap can be assumed to participate in the yielding ties.

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“…Hence there is still relevance in discussing the relative merits of the historical UK standards with the advent of the Eurocodes. The American and Canadian design codes (AASHTO, 2007;ACI, 2005;CSA, 1994) have moved in recent years to recommending STM for pile caps (Adebar and Zhou, 1996;Park et al, 2008) and so there is merit also in consideration of these methods alongside bending theory-based design.…”

Section: Introductionmentioning

confidence: 99%

Shear behaviour of reinforced concrete pile caps under full-width loading

Cao¹,

Bloodworth²

2012

Proceedings of the Institution of Civil Engineers - Structures

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There has been discrepancy in the design procedures for reinforced concrete (RC) pile caps in the UK design codes BS 8110 and BS 5400 that arose from the independent development of semi-empirical bending theory-based shear design formulae based on limited experimental data. Stimulated by the advent of the Eurocodes, a series of reduced-scale RC pile caps were tested under full-width wall loading to investigate their real shear capacity. The British Standards have been confirmed to be conservative, with the degree of conservatism found to be a function of shear enhancement factor and the width of cap over which shear enhancement is applied. The strut-and-tie model from BS 8110 gave better agreement with the experimental results, although the limit on the width of the tension tie of three pile diameters meant it became conservative at wide transverse pile spacings. A revision to the strut-and-tie model is proposed, in which longitudinal reinforcement across 90% of the cap width is considered to participate in the yielding tie.

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Strength predictions of pile caps by a strut-and-tie model approach

Cited by 29 publications

References 5 publications

Design of deep pile caps by strut-and-tie models

Design of deep pile caps by strut-and-tie models

Numerical Modeling of Shear Behavior of Reinforced Concrete Pile Caps

Shear behaviour of reinforced concrete pile caps under full-width loading

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