Optimization techniques for the design of high-performance fibre-reinforced concrete

Published on Mar 1, 2001in Structural and Multidisciplinary Optimization4.542
路 DOI :10.1007/S001580050165
Bhushan Lal Karihaloo56
Estimated H-index: 56
(Cardiff University),
D. Lange-Kornbak5
Estimated H-index: 5
Sources
Abstract
This paper will demonstrate how rigorous mathematical programming techniques can be employed in the design of fibre-reinforced concrete mixes which have both high tensile strength and high ductility. For this it is necessary to know how the microstructural parameters of a mix influence its macroscopic behaviour. The microstructural-macroscopic relationships are reviewed, and the corresponding optimization problem formulated and solved by nonlinear mathematical programming.
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3 Authors (S. Sharma, ..., T.Y. Chang)
References15
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#1Bhushan Lal Karihaloo (Cardiff University)H-Index: 56
#2J. Wang (ICL: Imperial College London)H-Index: 1
These lecture notes will describe a procedure for modelling the complete macroscopic response (including strain hardening and tension softening) of two short fibre reinforced cementitious composites and show how their microstructural parameters influence this response. From a mathematical point of view it is necessary to examine how bridging forces imposed by the fibres alter the opening of multiple cracks in elastic solids under unidirectional tensile loading. The strain hardening is essentiall...
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#1D. Lange-Kornbak (USYD: University of Sydney)H-Index: 5
#2Bhushan Lal Karihaloo (AAU: Aalborg University)H-Index: 56
Abstract The complete tension softening behaviour of short-fibre-reinforced cementitious composites which exhibit extensive matrix cracking is established by combining a fracture mechanical approach for bridged, discontinuous cracks with a statistical approach for a bridged, through-crack via consistent relationships for the bridging stress. These relationships account for adhesive and frictional bonding of fibres along a crack and are capable of accommodating the effects of fibre content and pr...
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#1Bhushan Lal Karihaloo (AAU: Aalborg University)H-Index: 56
#2Jianxiang Wang (ICL: Imperial College London)H-Index: 27
Last. M. Grzybowski (KTH: Royal Institute of Technology)H-Index: 1
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Abstract This paper presents a superposition approach for studying the influence of bridging forces upon the opening of multiple cracks in elastic solids under unidirectional tensile loading. The bridging forces may be purely elastic and proportional to the crack-opening displacements, but an elasto-plastic bridging law is more likely to represent reality in a short fibre-reinforced solid. The fibres debond from the elastic matrix at a certain critical crack-opening and thereafter provide a resi...
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Linear elastic fracture mechanics application of LEFM to concrete nonlinear fracture theories for concrete approximate nonlinear fracture models test methods for the determination of fracture parameters brittleness and size effect of concrete structures determination of the tension softening response of concrete application to plain concrete structures application to reinforced concrete structures application to high performance cementitious materials.
#1Andrzej M. BrandtH-Index: 6
Introduction Composites and Multiphase Materials Concrete-Like Composites Components of Cement Based Composites Reinforcement of Cement-Based Composites Structure of Cement Composites Interfaces Strength and Deformability Under Short-Term Static Load Cracking in Cement Matrices and Propagation of Cracks Fracture and Failure of Material Structures Behaviour of Cement Matrix Composites in Various Service Conditions Design and Optimization of Cement Based Composites High-Strength Concrete and High ...
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Abstract The concept of high packing density has been recently rediscovered, as a key for obtaining ultra-high-performance cementitious materials. First, this paper presents two models allowing to predict the packing density of a particle mix. These models are derived from the Mooney's suspension viscosity model. At a second step, considerations on the parameter to be maximized during the mix-design process are presented. Reference is made to the Maximum Paste Thickness concept, which leads to c...
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#1Paulo J.M. Monteiro (University of California, Berkeley)H-Index: 65
#2Paulo R. L. Helene (USP: University of S茫o Paulo)H-Index: 16
Last. S. H. KangH-Index: 1
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There are many methods for determining a concrete mix proportion when the compressive strength is the design criterion; however, there is much less information available when other criteria, such as the fracture energy or the elastic modulus, are specified. For these cases, a new mix design nomogram has been developed from well-established concrete relationships. The application of this method is demonstrated by an experimental programme which shows the influence of cement content, water-to-ceme...
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From experiments using fiber reinforced densified small particles containing high volume fraction of fine and short steel fibers, it was found that the formation of multiple cracking which occurs between the point of first cracking and the peak load, was the main cause for the improvement in total strain capacity. This region, which is the inelastic strain region due to microcracking, is a unique property of high-performance fiber reinforced concrete (FRC). Multiple microcracking is a property o...
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#2Surendra P. ShahH-Index: 116
Historical developments mechanics of fibers basic concepts of mechanical properties - tension, bending constitutive materials mixture proportions - mixing and casting procedures properties of freshly mixed FRC properties of hardened FRC compression, tension and flexure FRC under impact and fatigue loading creep, shrinkage and long-term performance of FRC plastic drying shrinkage fiber-reinforced shotcrete glass fiber reinforced cement (GFRF) thin sheet products slurry infiltrated fiber concrete ...
#1Victor C. Li (UM: University of Michigan)H-Index: 111
A micromechanical model is constructed for the compressive strength of fiber-reinforced cementitious composites (FRCs). This model is based on the classical models of compressive failure of brittle solids in which sliding microcracks induce wing-crack growth under compression loads. The concept of increased microcrack sliding resistance and wing-crack growth retardation associated with fiber bridging is exploited to produce a strengthening effect of fibers in composite strength. The concept of d...
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#1Muhammad Usman Rashid (University of Engineering and Technology)H-Index: 2
Abstract It is common perception that fiber reinforced concretes (FRCs) are prone to internal and external deterioration due to presence of fibers. This is the reason that construction industry is reluctant to use FRC despite of having large number of advantages. The main objective of this research is to investigate the natural weathering effect on prestressed concrete girders. These girders comprising of one control mix, two girders with steel fiber reinforced concrete (SFRC), two with polyprop...
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Abstract This paper analyses the bond behaviour of steel reinforcement bars in the matrix of nano-silica (NS)-modified self-consolidating engineered cementitious composites (SC-ECC). Presented first is the results of pull-out tests performed on three different diameters (12鈥痬m, 16鈥痬m, 20鈥痬m) sizes of reinforcing steel bar embedded in the matrix. Subsequently, the results of the experiment are used in identifying the bond-slip relationship which explains the interactions between steel bars and ma...
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#1Alireza Habibi (Shahed University)H-Index: 6
#2Jian Ghomashi (UKH: University of Kurdistan Hewler)H-Index: 1
Abstract The main objective of this study is to develop an optimum mix design method for self-compacting concrete (SCC) based on experimental results. For this purpose, mix design of self-compacting concrete is formulated as an optimization problem. Given the importance of manufacturing costs of concrete, the total cost of one cubic meter of self-compacting concrete is considered as the objective function in the optimization problem, which must be minimized. Limitation of the 28-day compressive ...
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#1Francisco Montero-Chac贸n (LUC: Loyola University Chicago)H-Index: 4
#2H茅ctor Cifuentes (University of Seville)H-Index: 14
Last. Fernando Medina (University of Seville)H-Index: 9
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This work presents a lattice鈥損article model for the analysis of steel fiber-reinforced concrete (SFRC). In this approach, fibers are explicitly modeled and connected to the concrete matrix lattice via interface elements. The interface behavior was calibrated by means of pullout tests and a range for the bond properties is proposed. The model was validated with analytical and experimental results under uniaxial tension and compression, demonstrating the ability of the model to correctly describe ...
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#2Manish SharmaH-Index: 12
#1Carl Fr茅d茅ric Hilchenbach (University of Stuttgart)H-Index: 1
#2Ekkehard Ramm (University of Stuttgart)H-Index: 53
The present contribution deals with a gradient based optimization strategy to improve the ductility of composite structures. In order to achieve the chosen optimization goal, stiff inclusions in a soft matrix are varied in shape and location controlled by the variation of implicit level-set functions. The eXtended Finite Element Method (XFEM) allows the use of a fixed structured mesh. For the non-linear constitutive behaviour an isotropic damage model is chosen for interface and matrix softening...
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#1Rachna AggarwalH-Index: 1
#2Maneek Kumar (Thapar University)H-Index: 9
Last. Mahesh Kumar Sharma (Thapar University)H-Index: 4
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This paper presents Reliability Based Design Optimization (RBDO) model to deal with uncertainties involved in concrete mix design process. The optimization problem is formulated in such a way that probabilistic concrete mix input parameters showing random characteristics are determined by minimizing the cost of concrete subjected to concrete compressive strength constraint for a given target reliability. Linear and quadratic models based on Ordinary Least Square Regression (OLSR), Traditional Ri...
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A method is proposed for proportioning self-compacting high- and ultra-high-performance concrete mixes without steel fibres (SCHPC/SCUHPC) and with steel fibres (SCHPFRC/SCUHPFRC) which meet the standard flow and passing ability criteria without segregation. This method is based on an extensive investigation of the flow characteristics of self-compacting concrete (SCC) mixes using computational simulations. It provides an alternative tool to the heuristic mix design of SCC, thus avoiding expensi...
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#1Hyun-Do YunH-Index: 22
#2Keitetsu RokugoH-Index: 14
Last. Sung-Chan LimH-Index: 1
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This paper describes a method to replace part of the concrete at the tensile bottom of one-way slabs with strain-hardening cement-based composite (SHCC) in order to mitigate cracking and improve the durability of the reinforced concrete (RC) members. Specifically, this paper explores the structural application of an expansive SHCC to mitigate crack damage in RC flexural members. The results of tests on eight simply supported RC slabs are described. The effects of the type of SHCC used and the SH...
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