stress analysis of concrete structures subjected to alkali

Stress Analysis of Concrete Structures Subjected to Alkali ...

Stress Analysis of Concrete Structures Subjected to Alkali-Aggregate Reactions by Victor Saouma, Luigi Perotti, and Takashi Shimpo. ACI Structural Journal/September-October 2007 533 various parameters; and 4) present three case studies ... Stress analysis = , , , , ) ...

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Stress Analysis of Concrete Structures Subjected to Alkali ...

Stress Analysis of Concrete Structures Subjected to Alkali-Aggregate Reactions. This paper, a follow-up to previous research, examines how a complex and coupled constitutive model for the alkali-aggregate reaction (AAR) in concrete can be used for the long-term (until reaction exhaustion) prediction of an AAR-affected concrete structure.

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Stress Analysis of Concrete Structures Subjected to ...

Mar 01, 1995  Predicting stress levels caused by thermal effects is a main factor in the correct design of structures; both relate to aspects of the maximum stress limitation and the durability of constructions. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable ...

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FINITE ELEMENT ANALYSIS OF CONCRETE STRUCTURES

The alkali-aggregate reaction was first reported in 1940 as a cause of severe cracking in some concrete structures. It is only in recent years that papers have been published dealing with the effects of AAR on the performance of structures. This thesis outlines a methodology for numerical simulation of the response of concrete subjected to ...

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Effect of Multiaxial Stresses on Alkali-Silica Reaction ...

structures. While concrete in structures is subjected to various stress states, the mechanism of ASR has been mostly investigated for unrestrained specimens. This study investi-gates the influence of uniaxial, biaxial, and triaxial stresses on the ASR-affected concrete by analyzing triaxial expan-

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Aging, Cracking and Shaking of Concrete Dams

Stress Analysis of Concrete Structures Subjected to Alkali Aggregate Reactions. American Concrete Institute Structural , Journal, Vol. 104, No. 5, pp. 532- 541, September-October, 2007. ... Normal Stress Distribution (t=3.260sec)-10-8-6-4-2 0 2 ... Data Preparation for Stress Analysis.

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Stochastic analysis of concrete dams with alkali aggregate ...

Jun 01, 2020  Stochastic analysis of concrete dams with alkali aggregate reaction ... As shown earlier, expansion depends on the temperature and stress field. ... Stress analysis of concrete structures subjected to alkali-aggregate reactions. ACI Mater. J., 104 (2007), pp. 532-541.

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MATERIAL, STRUCTURAL AND MODELLING ASPECTS OF

multiaxial expansions in concrete structures, such as nuclear concrete structures, that are subjected to stresses or restraints in one or more directions. The materials part of this work is, therefore, focused on the characterization of ASR-affected concrete under multiaxial stresses. Some of the test measurements

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Stress Analysis of Concrete Structures Subjected to ...

Mar 01, 1995  Predicting stress levels caused by thermal effects is a main factor in the correct design of structures; both relate to aspects of the maximum stress limitation and the durability of constructions. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable ...

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Characterization of concrete materials by using stress ...

Dec 02, 1999  A new instrument for monitoring the quality of concrete materials has been developed by Andec Mfg. Ltd. This new instrument, the AndeScope, can be used to evaluate concrete materials by measuring the stress wave velocity, dynamic elastic constant, quality factor (Q

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Macroscopic model of concrete subjected to alkali ...

Mar 01, 2004  1. Introduction1.1. General aspects of AAR expansion. Structural problems related to alkali–aggregate reaction (AAR) have been detected in concrete structures since the beginning of the 20th century, but it was not before 1940 that it was first identified by Stanton .Since then, many efforts have been made to minimize its deleterious effects on concrete.

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NONLINEAR ANALYSIS OF CONCRETE STRUCTURESt

finite element analysis of concrete structures can be very costly and may require considerable user exper- ... model behavior when it is subjected to various stress-strain paths. Finally, in Part II of tbe paper we ... present the results of the analyses of the Sandia pressure vessel, an alkali-silica reacted beam and a PWR prestressed concrete ...

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E ects of Uniaxal Stress on Alkali-Silica Reaction Induced ...

1 E ects of Uniaxal Stress on Alkali-Silica Reaction Induced 2 Expansion of Concrete Cyrille F. Dunant,a, Karen L. Scrivenerb 3 aUniversity of Toronto, Galbraith Building, 35 St. George street, CA ...

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FINITE ELEMENT ANALYSIS OF WALLS WITH ALKALI-SILICA ...

Reinforced Concrete, Alkali Silica Reaction (ASR), Cyclic Loading, Shear Capacity, FEA . 1. INTRODUCTION. The research program on assessment of structures subjected to concrete pathologies (ASCET) was organized by the OECD/NEA. The objective of this research program is to make general recommendations for aging management of concrete nuclear ...

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Evaluating Sensitivity of an AAR-Affected Concrete Arch ...

Jun 05, 2015  Alkali aggregate reaction may affect the ultimate strength and structural performance of wet concrete structures such as arch dams. In addition to chemically-dependent factors, such as alkali aggregate reactivity, humidity, the mixture materials, etc., some other parameters intensify the complexity of the reaction simulation. In this regard, structural responses, i.e., stress values, cracks ...

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Active Confinement Subjected to Monotonic and Cyclic Axial ...

analysis and design of GPC structures require a reliable and accurate material model of GPC, which can only be obtained by conducting multi-axial experiments on structural GPC. On the other hand, due to the inherent brittleness of GPC and the high demand for ductility of GPC structures subjected

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Victor E. Saouma Alkali-Aggregate Reactions

Hariri-Ardebili, M., and Saouma, V. (2018) Sensitivity and uncertainty analysis of AAR affected reinforced concrete shear walls Engineering Structures, Vol. 172, pp. 334-345; Liaudata, J. and Carol, I. and Lopez, C. and Saouma, V. (2018) ASR Expansions in Concrete under Triaxial Confinement Cement and Concrete Composites, Feb., pp 160-170

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(PDF) Effect of applied stresses on alkali–silica reaction ...

Several researchers developed models and methods in order to evaluate the degradation of ASR-damaged structures [1][2][3]. However, the effect of one major parameter is still badly known: the effect of applied stresses on ASR-induced strains.During all their service life, civil engineering structures may be subjected to large mechanical stresses.

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Saouma, Victor CU Experts CU Boulder

Stress, analysis of concrete structures subjected to alkali-aggregate, reactions. ACI Structural Journal. 532-541. 2007; Fracture mechanics based model for joints under cyclic loading. Journal of Engineering Mechanics. 1151-1159. 2006

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INFLUENCE OF CREEP AND STRESS STATES ON ALKALI

The structures affected by Alkali-Silica Reaction (ASR) to be re-assessed are frequently subjected to permanent loads such as dead weight, permanent external loadings or pre-stressing. Stresses make the strain variations within the structures rather complex to be analyzed.

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1. Introduction

Cement and concrete have been widely used in construction and civil engineering for over a century, while the production of cement entails several challenges that are environmentally detrimental, such as intensive carbon dioxide emissions and high energy consumption [1, 2].These environmental problems have become more prominent with societal development, and more attention has been paid to ...

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Influence of stress restraint on the expansive behaviour ...

Sep 15, 2010  @article{osti_21483651, title = {Influence of stress restraint on the expansive behaviour of concrete affected by alkali-silica reaction}, author = {Berra, M and Faggiani, G and Mangialardi, T and Paolini, A E}, abstractNote = {The primary objective of this study was to ascertain whether the Threshold Alkali Level (TAL) of the concrete aggregates may be taken as a suitable

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INFLUENCE OF CREEP AND STRESS STATES ON ALKALI

The structures affected by Alkali-Silica Reaction (ASR) to be re-assessed are frequently subjected to permanent loads such as dead weight, permanent external loadings or pre-stressing. Stresses make the strain variations within the structures rather complex to be analyzed.

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Effect of Multiaxial Stresses on Alkali-Silica ... - Concrete

Jul 01, 2017  Alkali-silica reaction (ASR) causes expansion, cracking, and degradation of the mechanical properties of concrete. While ASR performance of unrestrained concrete specimens is relatively well understood, the ASR performance of concrete structures is complicated by co-acting stresses. This paper investigates the influence of sustained multiaxial ...

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A coupled mechanical and chemical damage model for ...

Nov 15, 2013  A coupled mechanical and chemical damage model for concrete affected by alkali–silica reaction. United States: N. p., 2013. ... with the ultimate goal of reliably simulating and predicting the long-term performance of concrete structures subjected to various aging and degradation mechanisms. ... stress-dependent ASR swelling and elastic ...

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Alkali Aggregate Reaction in Nuclear Concrete Structures ...

To simulate the ASR effects on the structural behaviour of reinforced concrete elements, two mechanisms are considered in VecTor2: induced expansion, and ... Alkali Aggregate Reaction in Nuclear Concrete Structures: Part 4: Modelling and Analysis ...

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[PDF] Chemo-Mechanical Micromodel for Alkali-Silica ...

This paper presents a two-stage numerical model for alkali-silica reaction (ASR)/stress analysis in concrete. The coupled analytical chemo-mechanical model developed by Suwito et al. was modified to include the effects of internal moisture and ion concentration on the transport properties of concrete. A finite difference model was used to simulate the coupled diffusion of alkali into concrete ...

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FINITE ELEMENT ANALYSIS OF WALLS WITH ALKALI-SILICA ...

Reinforced Concrete, Alkali Silica Reaction (ASR), Cyclic Loading, Shear Capacity, FEA . 1. INTRODUCTION. The research program on assessment of structures subjected to concrete pathologies (ASCET) was organized by the OECD/NEA. The objective of this research program is to make general recommendations for aging management of concrete nuclear ...

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Concrete Expansion Induced by Alkali–Silica Reaction in a ...

Jan 03, 2017  Alkali–aggregate reaction in concrete structures consists of a chemically deleterious reaction between alkalis liberated during the cement hydration and reactive minerals present in the aggregates like silica, silicate or carbonate. The process leads to the formation of a gel, which expands in the presence of hydroxyl ions, causing cracks and volumetric variation in the concrete.

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(PDF) Analytical Study of Reinforced Concrete Element ...

Risk of accidents due to fire is more often and has become a common occurrence leading to the loss of lives and property In this regard, the study investigates the effects of fire on concrete members reinforced or strengthened with polypropylene

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Creep, Shrinkage and Durability Mechanics of Concrete and ...

CREEP, SHRINKAGE AND DURABILITY MECHANICS OF CONCRETE AND CONCRETE STRUCTURES contains the keynote lectures, technical reports and contributed papers presented at the Eighth International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8, Ise-shima, Japan, 30 September - 2 October 2008). The topics covered

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Experimental Study on Thermal Expansion Behavior of ...

Concrete is widely used in underground engineering and bears three-dimensional stress transmitted by overlying load. When a fire occurs, the thermal expansion of concrete structure under such stress state is different from that under stress-free state. For this purpose, a self-developed real-time high-temperature true triaxial test system was applied to investigate the thermal expansion ...

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The Effect Of Multiaxial Stresses On The Alkali-Silica ...

Jul 12, 2017  The Effect Of Multiaxial Stresses On The Alkali-Silica Reaction (ASR) Damage Of Concrete ... expansions in concrete structures that are subjected to

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MODELLING OF ALKALI-AGGREGATE REACTION IN

concrete subjected to AAR, including effects of the reinforcement presence, the 3D stress state and humidity. A real case study will be presented, showing a set composed by column, pile caps and piles of a building foundation structure that suffered the effect of AAR.

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Material, structural and modelling aspects of alkali ...

Material, structural and modelling aspects of alkali aggregate reaction in concrete . 10 0 0 0 0

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