Influence of prestressing on the punching strength of post-tensioned slabs

Thibault, Clément; Ramos, Aura; Ruiz, Miguel Fernández; Muttoni, Aurelio

doi:10.1016/j.engstruct.2014.04.034

Cited by 47 publications

(40 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Eccentric compression (as prestressing) can lead to even higher stiffness (lower rotation for the same level of load) than the response of a perfectly confined slab [11]. It should be noted that shrinkage of the slab may reduce that force.…”

Section: Influence Of Compressive Membrane Actionmentioning

confidence: 99%

“…The compression may result from prestressing [11] or from restrained lateral expansion due to external rigid elements (like shear walls) or the rigidity of the surrounding slab portion. The numerical model allows analyzing all these cases by varying the boundary conditions of the axisymmetric slab.…”

Section: Influence Of Compressive Membrane Actionmentioning

confidence: 99%

“…The internal forces considered are the bending moment m and the axial force n, whereas the related deformations are curvature v and dilation of the axis e. The law is based on an approach used by Muttoni [3] and Clément et al [11] but it is modified to describe the dilation of the axis and to approximate the response of a section under high tensile forces in a more suitable manner. The resulting curves and a comparison with a layered non-linear analysis are presented in Fig.…”

Section: Appendix B Multi-linear Sectional Analysismentioning

confidence: 99%

“…(1)) is applied to predict the punching capacity. The failure criterion may be modified to include the beneficial influence of the axial compressive forces acting on the control perimeter [11], which can also be obtained from the numerical analysis (Fig. 9(c)).…”

Section: Comparison Of the Numerical Model To Experimentsmentioning

confidence: 99%

“…With reference to the influence of an axial compression r n in the control perimeter, it can be taken into account by replacing the rotation w with a modified rotation w 0 = w + 45r n /E c P 0 as shown in [11]. The load-rotation curve may be calculated with several levels of approximation [4] and it may also include the influence of slab continuity [12], normal forces and applied moments [11,13].…”

Section: Punching Of Flat Slabsmentioning

confidence: 99%

See 4 more Smart Citations

Influence of moment redistribution and compressive membrane action on punching strength of flat slabs

Einpaul

Ruiz

Muttoni

2015

Engineering Structures

Self Cite

View full text Add to dashboard Cite

Type of publication:Peer reviewed journal article The punching shear strength of interior column connections of flat slabs has traditionally been investigated with isolated test specimens subjected exclusively to hogging bending moments. However, the behavior of such specimens is different from that of actual flat slabs, as the potentially beneficial phenomena of moment redistribution between hogging and sagging moments and compressive membrane action cannot take place in the conventional experiments. In the present paper, an axisymmetric numerical model is introduced that allows analyzing the role and significance of these effects on the flexural deformations of continuous flat slabs. Combined with the failure criterion of the Critical Shear Crack Theory, this model can be used to predict the punching capacities of such slabs. Comparisons are made to the results of some unconventional punching tests from the literature showing sound agreement between the modeling results and the experimental observations. The results suggest that the punching capacity of continuous slabs with low amounts of flexural reinforcement in the interior column regions may be underestimated in the current codes of practice.

show abstract

Section: Influence Of Compressive Membrane Actionmentioning

confidence: 99%

Section: Influence Of Compressive Membrane Actionmentioning

confidence: 99%

Section: Appendix B Multi-linear Sectional Analysismentioning

confidence: 99%

Section: Comparison Of the Numerical Model To Experimentsmentioning

confidence: 99%

Section: Punching Of Flat Slabsmentioning

confidence: 99%

See 3 more Smart Citations

Influence of moment redistribution and compressive membrane action on punching strength of flat slabs

Einpaul

Ruiz

Muttoni

2015

Engineering Structures

Self Cite

View full text Add to dashboard Cite

show abstract

100 Jahre Durchstanzen im Massivbau – Alles erforscht?

Ungermann

Kalus

Claßen

et al. 2022

Beton und Stahlbetonbau

View full text Add to dashboard Cite

Flachdecken sind eine heute oft ausgeführte Konstruktionsform im Hoch‐ und Industriebau, die zu Beginn des 20. Jahrhunderts erstmals angewendet wurde. Flachdecken ermöglichen vor allem flexibel und nachhaltig nutzbare Gebäudestrukturen, die maßgeblich zur Verlängerung der Gesamtnutzungsdauer beitragen. Das durch die punktförmige Lagerung verursachte Durchstanzversagen stellt in der Bemessung oftmals den entscheidenden Nachweis dar. Seit mehr als 100 Jahren ist daher eine Vielzahl experimenteller und numerischer Untersuchungen zum Durchstanzen durchgeführt worden. Hierbei lag der Fokus gleichermaßen auf dem Durchstanzen bei Flachdecken und Fundamenten, die im Vergleich durch ihre gedrungene Ausführung ohne günstig wirkende Plattenmembranwirkungen ein verändertes Tragverhalten aufweisen. In diesem Beitrag werden die wesentlichen Meilensteine in der historischen Entwicklung punktförmig gelagerter Platten aufgezeigt und anschließend aktuelle Untersuchungen am Institut für Massivbau in Aachen vorgestellt. Dabei geht der Beitrag auch auf die Frage ein, ob trotz der langen Forschungshistorie immer noch wissenschaftlicher Forschungsbedarf besteht.

show abstract

Experimental and theoretical evaluation of punching strength of steel fiber reinforced concrete slabs

Gouveia

Lapi

Orlando

et al. 2017

Structural Concrete

View full text Add to dashboard Cite

This paper deals with the experimental and theoretical evaluation of punching shear capacity of steel fiber reinforced concrete (SFRC) slab-column connections. Five experimental specimens with a thickness of 160 mm, different fiber volume contents (0, 1.0, and 1.5%) and different flexural reinforcement ratios (0.75 and 1.5%) have been tested. The experimental results were evaluated using a physicalmechanical model based on the critical shear crack theory (CSCT). The model has given a good approximation of experimental punching shear strengths. In general, tests have highlighted a significant increase in load and deformation capacity of fiber reinforced concrete slab-column connections in comparison with reinforced concrete connections.Punching failure mechanism has been the issue of several studies since the early twentieth century until today. In the early 1960s, Kinnunen and Nylander 1 developed a landmark mechanical model for subsequent theories. This model is based on the assumption that punching shear strength is attained at a given critical rotation of the slab. In 1989, Shehata and Regan, 2 starting from Kinnunen and Nylander approach, proposed a new model where they hypothesized three different types of failure. In 1990, Broms 3 improved Kinnunen and Nylander model, including unsymmetrical punching and size effect.In 1991, Muttoni and Schwartz 4 presented the basis of a new mechanical model, whose first draft was published in 2003 5 ; finally, in 2008, the final version of the critical shear crack theory (CSCT) was published. 6 CSCT describes the relationship between punching strength and the width of the critical shear crack accounting for its roughness. Two curves are defined, the first curve describing the failure criterion, and the second representing the load-rotation relationship of the flat slab. The critical state is set at the intersection between these two curves (Figure 1).The CSCT, thanks to its versatility and consistency, can be used in many different cases, like flat slabs with shear reinforcement 7,8 , SFRC slabs 9,10 , and prestressed concrete slabs. [11][12][13][14] Furthermore, CSCT can be applied to slabs strengthened using different techniques, like externally glued fiber reinforced polymers 15 or post-installed shear reinforcement. [16][17][18] For this reason, CSCT has been included in codes of practice and it is the basis for fib Model Code 2010 19 punching design and verification.When fibers are added to concrete, the mechanical properties of concrete change. The post-cracking tensile behavior improves, as fibers delay crack propagation. The behavior of the composite material (SFRC) is highly affected by the fiber reinforcement ratio. The softening behavior, typical of uniaxial test, can be significantly modified by the presence of fibers (Figure 2).

show abstract

Influence of prestressing on the punching strength of post-tensioned slabs

Cited by 47 publications

References 7 publications

Influence of moment redistribution and compressive membrane action on punching strength of flat slabs

Influence of moment redistribution and compressive membrane action on punching strength of flat slabs

100 Jahre Durchstanzen im Massivbau – Alles erforscht?

Experimental and theoretical evaluation of punching strength of steel fiber reinforced concrete slabs

Contact Info

Product

Resources

About