Punching resistances of unbonded post-tensioned slabs by decompression methods

Silva, R. J. Carvalho; Regan, P. E.; Melo, Guilherme S.

doi:10.1680/stco.6.1.9.62459

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The ratio of vertical shear force to the moment per unit width (V/m) depends on the column geometry and loading arrangement. Silva et al (2005) showed that the redistribution of forces occurring after cracking makes it unnecessary to consider elastic concentration of stress. Hence, the moment can be averaged across the width of specimen or within the contraflexure lines.…”

Section: Proposed Formulamentioning

confidence: 99%

Shear strength of slab-column connections under gravity and cyclic lateral loading

Himawan.¹

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The main objective of this research is to study the shear strengths of reinforced concrete and post-tensioned slab-column connections under gravity and cyclic lateral loading. This study covers interior, edge, and corner connections constructed using normalweight concrete. The effects of prestressing force, column rectangularity, unbalanced moment transfer, and cyclic loading are included. However, only slab-column connections without beams, drop panels, column capitals, openings, and any type of shear reinforcement are considered in this study.

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Section: Proposed Formulamentioning

confidence: 99%

Shear strength of slab-column connections under gravity and cyclic lateral loading

Himawan.¹

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Design for punching of prestressed concrete slabs

Thibault

Ramos

Ruiz

et al. 2013

Structural Concrete

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Prestressing in flat slabs helps to control deformations and cracking under service loads and allows the required slab thickness to be reduced, thus leading to more slender structures and an economic solution for long spans. However, as a consequence of the limited thickness of these members, punching typically governs at the ultimate limit state. Studies of the punching shear strength have shown that the presence of prestressing in flat slabs has a number of potential beneficial effects, namely the vertical component (force) carried by inclined tendons, the in‐plane compression stresses and the bending moments developed near the supported region. However, the approach provided by codes of practice for punching design in the presence of prestressing may differ significantly. Some codes neglect the influence of the bending moments introduced as a result of prestressing and the sections at which the deviation forces of the tendons are considered may be located at different distances from the edge of the supported region. The influence of prestressing on the punching shear strength of members without shear reinforcement is investigated in this paper by using the fundamentals of the critical shear crack theory. Using that as a basis, and also taking into account 65 tests available in the scientific literature, the suitability and accuracy of a number of design codes, e.g. Model Code 2010, Eurocode 2 and ACI 318‐11, are investigated and compared.

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Punching resistances of unbonded post-tensioned slabs by decompression methods

Cited by 2 publications

References 2 publications

Shear strength of slab-column connections under gravity and cyclic lateral loading

Shear strength of slab-column connections under gravity and cyclic lateral loading

Design for punching of prestressed concrete slabs

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