Design of Concrete Structures with Stress Fields

Muttoni, Aurelio; Schwartz, Joseph; Thürlimann, B.

doi:10.1007/978-3-0348-9047-2

Cited by 108 publications

(139 citation statements)

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“…These solutions are nevertheless difficult to be used in practice due to the bents and hooks required for the flexural bars. -The worst performances are in general obtained for the flexural arrangement type C (flexural bars developed in the compression chords [29], Fig. 3d), which is however, very simple to be arranged in practice.…”

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 98%

“…where q refers to the geometrical reinforcement ratio (cross-sectional area of the reinforcement divided by the width and effective depth of the section), f y refers to the yield strength of the reinforcement and f cp to the plastic strength of concrete (f cp = f c Ág fc , where f c is the compressive strength of concrete measured in cylinder and g fc a brittleness factor [29,30]: g fc = (30/f c [MPa]) 1/3 6 1).…”

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

“…In these cases, the inner forces ( Fig. 2c) can be deviated in an efficient manner [29] with development of a CTT node (tension chords in equilibrium with an inclined compression strut) and a CCC node (only compression struts at the node). -On the other hand, opening corners perform in general worse than closing corners for the same amount of mechanical reinforcement ratio.…”

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

“…-On the other hand, opening corners perform in general worse than closing corners for the same amount of mechanical reinforcement ratio. Their behaviour is highly influenced by the detailing of the CCT nodes [29] (Fig. 2d, one tension chord in equilibrium with two compression struts).…”

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

“…2b). Research has been founded on experimental works and some design approaches have been proposed on their basis, mostly based on lower-bound solutions of the theory of plasticity (strut-and-tie modelling [1,28,29], refer to Fig. 2c, or stress fields [29][30][31], refer to Fig.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of nodal regions of reinforced concrete frames subjected to opening moments and proposals for their reinforcement

Campana

Ruiz

Muttoni

2013

Engineering Structures

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Type of publication:Peer reviewed journal article The strength and deformation capacity of concrete frames is typically governed by their nodal regions behaviour. This is particularly relevant for frame corners subjected to opening bending moments, where premature brittle failures may develop depending on the reinforcement arrangement. Although some previous investigations have shown a significant dependence of the nodal regions behaviour as a function of the corner angle (a, measured between frame axes), most research has concentrated on orthogonal corners (a = 90°). However, design recommendations obtained for orthogonal corners may not be directly applicable (neither optimal) for other corner angles, and particularly for larger corner angles. In this paper, the result of an experimental and theoretical investigation on frame corners with a corner angle (a = 125°) is presented. Sixteen tests were performed on 400-mm thickness specimens representative of actual frame corners subjected to opening bending moments. The experimental results are investigated by means of Elastic-Plastic Stress Fields and strut-and-tie models leading to a number of recommendations for their design in practice.

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Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 98%

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

Section: Behaviour Of Orthogonal Nodal Regionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Behaviour of nodal regions of reinforced concrete frames subjected to opening moments and proposals for their reinforcement

Campana

Ruiz

Muttoni

2013

Engineering Structures

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Querkrafttragfähigkeit von Stahlbetonträgern

Sigrist

Hackbarth

2010

Beton und Stahlbetonbau

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Auch nach vielen Jahren teilweise intensiver Forschung wird die Bestimmung des Querkraftwiderstands von Stahl‐ und Spannbetonträgern in der Fachwelt weiterhin rege diskutiert. Dies liegt einerseits an der Komplexität des Problems, andererseits an der Weiterentwicklung von Bauweisen und Baustoffen sowie den veränderten Fragestellungen. Im vorliegenden Beitrag wird ein dreistufiges Vorgehen präsentiert, das die Bemessung, die Überprüfung und die detaillierte rechnerische Beurteilung von Bauteilen unter Querkrafteinwirkung umfasst. Im Zentrum stehen die Verallgemeinerten Spannungsfelder, die sich insbesondere für die vertiefte Untersuchung und die generelle Überprüfung eines Tragwerks eignen. Die entsprechenden Festlegungen sind durch Versuche gut abgesichert und so aufbereitet, dass sie sich für die Anwendung in der Ingenieurpraxis eignen. Die auf dieser Grundlage ermittelten Querkraftwiderstände werden denjenigen nach den Normen DIN 1045‐1 und Eurocode 2 gegenübergestellt. Es zeigt sich, dass eine Überprüfung der Normvorschriften angebracht wäre. Generell soll der Beitrag zur Diskussion und weiteren Entwicklung der nationalen und internationalen Normen beitragen.Shear Strength of Structural Concrete BeamsEven after many years of in‐depth research, the determination of shear strength of structural concrete beams is still in discussion. The reasons for that are, on the one hand, the complexity of the problem and, on the other hand, further developments of structural systems and building materials as well as new questions arising from the evaluation of existing structures. In this contribution a structured procedure including design, detailed analysis and elaborate assessment of structural concrete members subjected to shear is presented. The focus is on the Generalized Stress Field Approach which particularly enables a profound analysis and a general evaluation of a structure. The corresponding definitions are well supported by experimental results and arranged to be easily used in practical application. Shear strengths calculated on the basis of this method are compared to results according to DIN 1045‐1 and Eurocode 2. It shows that a re‐evaluation of the code provisions is well appropriate. Basically, this contribution may be regarded as a contribution to the discussion about the development of national and international codes.

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Haunch retrofit of RC beam–column joints: Linear stress field analysis and Strut‐and‐Tie method application

Marchisella

Muciaccia

2023

Earthq Engng Struct Dyn

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This paper addresses the stress field of reinforced concrete (RC) beam–column joints retrofitted with haunches. Design of such solution currently assumes internal forces evaluated by the so called β‐factor approach, which was originally conceived targeting the enhancement of steel moment‐resisting frames. Extension to RC is subsequent as it emerges from the literature survey. The analytical model is first critically rediscussed. Inconsistencies of the adopted structural scheme, with respect to the actual mechanical behavior, may lie on the compatibility conditions which are imposed between the haunch and concrete beam (or column). In this regard, two‐dimensional finite element models (FEM), using linear‐elastic materials, are employed to study the stress field of two benchmark specimens derived from literature. A partial validation is carried out against experimentally derived internal forces. Results show that, for haunches with extended flat plates and stiff diagonals, compressive diffusion affects the entire haunch region. Consequently, beam's kinematic hypothesis of linear strains is no longer valid. The predicted joint shear demand resulted underestimated by β‐factor approach by 50%. Since 2D FEM may be not efficient for many practical circumstances, an application of Strut‐and‐Tie is alternatively proposed. Finally, both the limitations and possible extensions of the proposed approaches are stated transparently.

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Design of Concrete Structures with Stress Fields

Cited by 108 publications

References 0 publications

Behaviour of nodal regions of reinforced concrete frames subjected to opening moments and proposals for their reinforcement

Behaviour of nodal regions of reinforced concrete frames subjected to opening moments and proposals for their reinforcement

Querkrafttragfähigkeit von Stahlbetonträgern

Haunch retrofit of RC beam–column joints: Linear stress field analysis and Strut‐and‐Tie method application

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