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Predicting shear failure in reinforced concrete members using a three-dimensional peridynamic framework

#1Mark Hobbs (University of Cambridge)

#2G Hattori (University of Cambridge)H-Index: 6

Last. John Orr (University of Cambridge)H-Index: 10

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Abstract null null The assumptions made in design codes can result in unconservative predictions of shear strength for reinforced concrete members. The limitations of empirical methods have prompted the development and use of numerical techniques. A three-dimensional bond-based peridynamic framework is developed for predicting shear failure in reinforced concrete members. The predictive accuracy and generality of the framework is assessed against existing experimental results. Nine reinforced co...

#1Mads E. Andersen (DTU: Technical University of Denmark)H-Index: 1

#2Peter Noe Poulsen (DTU: Technical University of Denmark)H-Index: 11

Last. John Forbes Olesen (DTU: Technical University of Denmark)H-Index: 18

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Abstract null null A numerical analysis of the limit state for solids, with an adequately described structural geometry, is often a computationally demanding task, and there is a need for an effective method. The existing solid elements for Finite Element Limit Analysis (FELA) are either computationally expensive or require a stress cutoff of the yield surface for triaxial stress states. This paper presents an effective partially mixed lower bound tetrahedral constant stress solid element that c...

Type 4 bell-shaped proportional damping model and energy dissipation for structures with inelastic and softening response

#1Chin-Long Lee (Cant.: University of Canterbury)H-Index: 7

Abstract null null Several damping models were proposed to incorporate un-modeled damping when simulating seismic response of large-scale structures, but most did not provide parameter calibration against energy dissipation. This study addresses this problem by developing a new bell-shaped proportional damping model, allowing energy dissipation to be directly related to modal damping ratio. It also addresses the concerns of using proportional damping models with the tangent stiffness approach. T...

Genetic algorithm using probabilistic-based natural selections and dynamic mutation ranges in optimizing precast beams

#1Tien Dat Pham (Kyung Hee University)H-Index: 1

#2Won-Kee Hong (Kyung Hee University)H-Index: 16

Abstract null null In this paper, optimal designs for precast beams were determined using a genetic algorithm. Two new features for enhancing genetic algorithms were developed in the present study, considerable improvements obtained by applying the proposed methods were shown in a parametric study. Firstly, probabilistic-based natural selection was introduced, selecting parental chromosomes for reproduction using inherited probabilities calculated by the ranking of each design among populations....

Recurrent neural network-based multiaxial plasticity model with regularization for physics-informed constraints

#1L. Borkowski (Raytheon)

#2C. Sorini (ASU: Arizona State University)

Last. Aditi Chattopadhyay (ASU: Arizona State University)H-Index: 31

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Abstract null null A recurrent neural network (RNN) based model is developed as a surrogate to predict nonlinear plastic response under multiaxial loading. The RNN-based model is trained and tested on stress versus strain curves generated using a numerical solution based on the classical radial return method. Besides simply learning the basic constitutive relationship, a novel approach is taken to enforce certain physical conditions. Specifically, regularization is employed to maintain non-negat...

A non-standard numerical method for finite element modelling of tensile cracks in quasi-brittle material

#1Manuela Alessandra Scamardo (Polytechnic University of Milan)H-Index: 3

#2Alberto Franchi (Polytechnic University of Milan)H-Index: 12

Last. Pietro Crespi (Polytechnic University of Milan)H-Index: 7

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Abstract null null In this paper, a non-standard finite element (FE) method, coupled with a mathematical programming procedure, is presented to simulate initiation and propagation of in-plane tensile cracks in quasi-brittle material. Potential crack lines are defined and limited by the FE edges. The cracks are considered as localized plastic deformations imposed at the nodes along the potential crack paths. Crack opening is detected at each node by a limit value of tensile force normal to the cr...

#1Mikail F. Lumentut (Curtin University)H-Index: 10

#2Michael I. Friswell (Swansea University)H-Index: 84

Abstract null null The dynamics of elastic cantilevered smart pipes conveying fluid with non-uniform flow velocity profiles is presented for optimal power generation. The Navier-Stokes equations are used to model the incompressible flow in the circular smart pipe, and flow profile modification factors are formulated based on the Reynolds number and Darcy friction factor. The coupled constitutive dynamic equations, including the electrical circuit, are formulated for laminar and turbulent flows. ...

Return mapping with a line search method for integrating stress of the distortional hardening law with differential softening

#1Jinwoo LeeH-Index: 19

#2Hyuk Jong BongH-Index: 12

Last. Myoung-Gyu LeeH-Index: 44

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Per-phase spatial correlated damage models of UD fibre reinforced composites using mean-field homogenisation; applications to notched laminate failure and yarn failure of plain woven composites

#1Ling Wu (University of Liège)H-Index: 14

#2Tianyu Zhang (University of Liège)

Last. Ludovic Noels (University of Liège)H-Index: 24

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Abstract null null A micro-mechanical model for fibre bundle failure is formulated following a phase-field approach and is embedded in a semi-analytical homogenisation scheme. In particular mesh-independence and consistency of energy release rate for fibre bundles embedded in a matrix phase are ensured for fibre dominated failure. Besides, the matrix cracking and fibre-matrix interface debonding are modelled through the evolution of the matrix damage variable framed in an implicit non-local form...

#1Marta Knawa-Hawryszków (Wrocław University of Technology)H-Index: 1

#2Dawid Prokopowicz (Wrocław University of Technology)H-Index: 3

Last. D. Bryja (Wrocław University of Technology)H-Index: 6

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Abstract null null This paper proposes a continuous approach to formulation of a general three-dimensional nonlinear cable model. The model’s assumptions include selected acceptable restrictions regarding its application to various types of civil engineering structures. The model is dedicated to static and dynamic analyses of complex tension structures, particularly the ones subjected to moving loads. In order to demonstrate the versatility and comprehensiveness of the computational model two ex...

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