Application of plastic-damage multidirectional fixed smeared crack model in analysis of RC structures

Purpose Near-surface mounted (NSM) fiber-reinforced polymer (FRP) rod is extensively applied in reinforced concrete (RC) structures. The mechanical performances of NSM FRP-strengthened RC structures depend on the bond behavior between NSM reinforcement and concrete. This behavior is typically studied by performing pull-out tests; however, the failure behavior, which is crucial to the local debonding process, is not yet sufficiently understood. Design/methodology/approach In this study, a three-dimensional meso-scale finite element method considering the cohesion and adhesion failures is presented to model the debonding failure process in pull-out tests of NSM FRP rod in concrete. The smeared crack model is used to capture the cohesion failures in the adhesive or concrete. The interfacial constitutive model is applied to simulate the adhesion failures on the FRP-adhesive and concrete-adhesive contact interfaces. Findings The present method is first validated by two simple examples and then applied to a practical NSM FRP system. This work studied in detail the debonding process, the bond failure types, the location of peak bond stress, the transmitting deformation in adhesive and the morphology of contact zone. The developed method provides a practical and convenient tool applicable for further investigations on the debonding mechanism for the NSM FRP rod in concrete. Originality/value A three-dimensional meso-scale finite element method considering the cohesion and adhesion failures is presented to model the debonding failure in NSM FRP-strengthened RC structures. The smeared crack model and the interfacial constitutive model are introduced to develop a convenient approach to analyze the failures in adhesive, concrete and related interfaces. The developed numerical method is applicable for studying the debonding process, the bond failure types, the location of peak bond stress, the transmitting deformation in adhesive and the morphology of contact zone in detail.

Download Full-text

Overview of Numerical Simulation Model of Mesoscopic Concrete Crack

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.744-746.1443 ◽

2015 ◽

Vol 744-746 ◽

pp. 1443-1447

Author(s):

Si Qi Li ◽

Yin Bai

Keyword(s):

Numerical Simulation ◽

Finite Element ◽

Element Model ◽

Crack Model ◽

Discrete Fracture Model ◽

Model Studies ◽

Concrete Crack ◽

Fracture Models ◽

Smeared Crack ◽

Smeared Crack Model

Through a number of literature analysis and research, this paper investigates the reviews and comparison under the meso model for numerical simulation of crack in a finite element model (FEM), including discrete fracture model, smeared crack model, fracture mechanics crack model,bond crack model. Studies show that: compared to other fracture models , smeared crack model by eliminating the need to change the unit type and re-division unit grid computing simple and widely used for treatment of concrete cracks in finite element method, the author cites a using smeared crack model example that are discussed in the paper.

Download Full-text

Cracking Behavior of a Concrete Arch Dam with Weak Upper Abutment

Mathematical Problems in Engineering ◽

10.1155/2017/6541975 ◽

2017 ◽

Vol 2017 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Lei Xu ◽

Shuaizhao Jing ◽

Jie Liu ◽

Yefei Huang

Keyword(s):

Mechanical Properties ◽

Sensitivity Analysis ◽

Failure Mode ◽

Arch Dam ◽

Dam Failure ◽

Crack Model ◽

Cracking Behavior ◽

Concrete Arch Dam ◽

Smeared Crack ◽

Smeared Crack Model

The cracking behavior and failure mode of a 78 m high concrete double-curvature arch dam with weak upper abutment are investigated through performing cracking analysis. The mechanical behavior of concrete is simulated using a smeared crack model, in which a combination of the compression yield surface and the crack detection surface with a damaged elasticity concept is employed to describe the failure of concrete. The arch dam with practical mechanical properties of the upper and lower abutments is firstly studied with emphasis on its cracking behavior during overloading. Then, a comprehensive sensitivity analysis is carried out to investigate the influence of the ratio of the mechanical properties of upper abutment to those of lower abutment on dam failure with prime attention placed on the failure mode. Simulation results indicate the adopted smeared crack model is well-suited to the crack analysis of concrete arch dam. It is shown that cracking is localized around the interface between upper and lower abutments, which leads to a fast crack growth in the through-thickness direction of dam and finally causes the dam failure. Furthermore, the sensitivity analysis presents three types of failure modes corresponding to different ratio value, wherein Modes II and III should be avoided since the weak upper abutment plays a predominant role in the cracking and failure of concrete arch dam.

Download Full-text

Probabilistic Nonlinear Analysis of Bubble Tower Structure due to Extreme Pressure and Temperature

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.821.725 ◽

2016 ◽

Vol 821 ◽

pp. 725-732 ◽

Cited By ~ 1

Author(s):

Juraj Králik ◽

Juraj Kralik

Keyword(s):

Probabilistic Analysis ◽

Linear Analysis ◽

Crack Model ◽

Extreme Pressure ◽

Structural Resistance ◽

Tower Structure ◽

Smeared Crack ◽

Ansys System ◽

Analysis Models ◽

Smeared Crack Model

This paper presents an application of the probabilistic analysis of structural resistance of the bubble tower structure of a VVER 440/213. The evaluation is based on an extension of the smeared crack model developed on base of Kupfer's bidimensional failure criterion, rotated crack, CEB-FIP model of failure energy and implemented into the ANSYS system. The non-linear analysis was considered for the median values of the input data and the probabilistic analysis models the uncertainties of loads, material resistance and other modeling issues.

Download Full-text