On Development of Suitable Stress Fields for Structural Concrete

Ruiz, Miguel Fernández; Muttoni, Aurelio

doi:10.14359/18780

Cited by 24 publications

(9 citation statements)

References 11 publications

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“…where F T is the measured tangential force, F N is the measured normal force, A sp = πD 2 steel /4 is the area of the horizontal projection of a sphere and f cp is the equivalent plastic compressive resistance of the material accounting for the material brittleness in compression and for the fact that the plastification is a gradual process (with regions in the softening phase while others attain the material strength [22], [23]). According to Model Code 2010 [21], this value can be estimated as:…”

Section: Tests With Concrete Specimensmentioning

confidence: 99%

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Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Pundir

Tirassa

Ruiz

et al. 2019

Cement and Concrete Research

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Aggregate interlocking allows transferring shear and normal stresses through open cracks, and is considered to significantly contribute to the force transfer in cracked concrete. The complex phenomenon depends on the roughness of cracked surfaces, where material protruding from one side may engage with the opposite one. Two-Phase models were established in the 1980's by Walraven to estimate the force transfer, distinguishing between cement matrix and spherical aggregates. The approach leads to good results but has several shortcomings. In this paper, the fundamental assumptions are reviewed using specific numerical and experimental investigations. Special tests respecting the geometrical assumptions are presented and the results compared with numerically calculated estimates. The model is extended to address some shortcomings and investigate the physical nature of the main parameters. Positive aspects of Two-Phase Models and a number of limitations are highlighted, allowing a consistent step forward in the understanding of aggregate interlocking.

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Section: Tests With Concrete Specimensmentioning

confidence: 99%

“…A suitable value for f c,ref is 30 MPa [21], [23]. Each test is plotted as four curves in a graph with four axes, to better show the relationship between the measured values of τ , σ, δ and w.…”

Section: Tests With Concrete Specimensmentioning

confidence: 99%

Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Pundir

Tirassa

Ruiz

et al. 2019

Cement and Concrete Research

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“…When the load-carrying capacity of concrete structures is determined by use of rigid-plastic or elasto-plastic models, the plastic concrete compressive strength, f cp , used in the concrete failure criterion (21) should be based on a reduction of the uniaxial compressive strength, f c , with the effectiveness factor, ν. 23,24 Adopting in this paper a formulation of ν similar to the one in the fib Model Code 2010, 25 the definition becomes:…”

Section: Concrete Effectiveness Factormentioning

confidence: 99%

Design‐oriented elasto‐plastic analysis of reinforced concrete structures with in‐plane forces applying convex optimization

Vestergaard

Larsen

Hoang

et al. 2021

Structural Concrete

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Assessment of the cracked behavior at service load and verification of sufficient deformation capacity in the ultimate state are often required when designing reinforced concrete structures. Most existing methods dedicated to nonlinear analysis of reinforced concrete, however, are not well-suited in practice for use in design processes involving large-scale structural problems due to an enormous modeling effort and lack of numerical stability. This paper presents a new finite element framework for efficient elasto-plastic analysis of two-dimensional reinforced concrete structures subjected to in-plane forces. The basic concept is to adopt a stress-based finite element formulation and cast the problem as a convex optimization problem where energy principles are invoked through a formalistic application of nonlinear-elastic material models. The method accounts for reinforcement yielding and concrete crushing, including the strength reduction due to cracking, and can be used to imitate the elasto-plastic response of fully-cracked structures subjected to monotonic loading. The efficiency of the method is demonstrated, inter alia, by an analysis of a complex structure, where the discretized problem has more than 1 million variables and is solved within a few minutes on a standard personal computer.

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“…El diseño y detallado del acero de refuerzo conforme a modelos de armadura es una herramienta imprescindible para identificar e interpretar las fuerzas en los elementos de concreto ante los efectos de: i) cortante, ii) flexión, iii) fuerza axial y, iv) torsión (Marti 1985a(Marti /b, 1991Schlaich et al 1987, Muttoni et al 1997. Este enfoque ha permitido la elaboración de métodos de diseño que predicen con un margen de seguridad adecuada la resistencia del concreto reforzado, pues se sustenta en hipótesis conservadoras (Fernández-Ruiz y Muttoni 2007).…”

Section: Capítulo 1: Objetivo Del Trabajounclassified

“…A diferencia de ellos, los efectos de cortante son difíciles de explicar, pues los parámetros que los definen son muchos (Kani 1964). Para intentar entender el cortante en trabes de concreto con y sin refuerzo transversal, se han hecho estudios experimentales (por ejemplo, Mörsch 1909, Talbot 1909, Bresler y Scordelis 1963, Kani 1964, entre otros) y analíticos (por ejemplo, Thürlimann 1979, Marti 1985a/b, Schlaich et al 1987, Fernández-Ruiz y Muttoni 2007, Archundia y Tena 2015. Sin embargo, a la fecha no se tiene una teoría unificada que explique en su totalidad la distribución de las fuerzas internas en el concreto debidas a cortante.…”

Section: Capítulo 2: Retrospectiva Del Diseño a Cortante En Trabes De...unclassified

Verificación experimental de los campos de esfuerzo y modelos de armadura en trabes esbeltas de concreto reforzado

Valdes¹

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Con la intención de mejorar el entendimiento del mecanismo a cortante en trabes esbeltas de concreto reforzado, Archundia y Tena (2015) propusieron un parámetro de esbeltez plástica sustentado en: i) modelos de armadura, ii) definiciones estrictas de las regiones B-D y, iii) una definición con sustento mecánico para la sección crítica por cortante. Aunque la propuesta es consistente con la mecánica del concreto, desde el punto de vista de un diseño con modelos de armadura o un diseño por secciones, requiere de validez experimental. El objetivo general de este trabajo es proporcionar respaldo experimental al marco teórico propuesto por Archundia y Tena (2015) para explicar el comportamiento a cortante de trabes esbeltas de concreto reforzado.

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On Development of Suitable Stress Fields for Structural Concrete

Abstract: Strut -and-tie

Cited by 24 publications

References 11 publications

Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Review of fundamental assumptions of the Two-Phase model for aggregate interlocking in cracked concrete using numerical methods and experimental evidence

Design‐oriented elasto‐plastic analysis of reinforced concrete structures with in‐plane forces applying convex optimization

Verificación experimental de los campos de esfuerzo y modelos de armadura en trabes esbeltas de concreto reforzado

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