scholarly journals Contribution to the damage modelling of reinforced concrete structures

2018 ◽  
Vol 149 ◽  
pp. 01052
Author(s):  
Mourad KHEBIZI ◽  
Hamza GUENFOUD ◽  
Mohamed GUENNFOUD
Keyword(s):  
Reinforced Concrete ◽  
Numerical Models ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Nonlinear Behaviour ◽  
Cracked Concrete ◽  
Finite Elements Modeling ◽  
Linear Behaviour ◽  
Cyclical Loading ◽  
Good Agreement

A two-dimensional multi-layered finite elements modeling of reinforced concrete structures at nonlinear behaviour under monotonic and cyclical loading is presented. The non-linearity material is characterized by several phenomena such as: the physical non-linearity of the concrete and steels materials, the behaviour of cracked concrete and the interaction effect between materials represented by the post-cracking field. These parameters are taken into consideration in this paper to examine the response of the reinforced concrete structures at the non-linear behaviour. Two examples of application are presented. The numerical results obtained, are in a very good agreement with available experimental data and other numerical models of the literature.

scholarly journals Influence of ground motion duration on ductility demands of reinforced concrete structures

2019 ◽  
Vol 11 (4) ◽  
pp. 503-517 ◽  
Author(s):  
Eric De Jesus Vega ◽  
Luis A. Montejo
Keyword(s):  
Reinforced Concrete ◽  
Short Duration ◽  
Numerical Models ◽  
Dynamic Properties ◽  
Response Spectrum ◽  
Concrete Structures ◽  
Strong Motion ◽  
Reinforced Concrete Structures ◽  
Inelastic Demand ◽  
Long Duration

Abstract This article investigates the level of influence that strong motion duration may have on the inelastic demand of reinforced concrete structures. Sets of short-duration spectrally equivalent records are generated using as target the response spectrum of an actual long-duration record. The sets of short-duration records are applied to carefully calibrated numerical models of the structures along with the target long-duration records. The input motions are applied in an incremental dynamic analysis fashion, so that the duration effect at different levels of inelastic demand can be investigated. It was found that long-duration records tend to impose larger inelastic demands. However, such influence is difficult to quantify, as it was found to depend on the dynamic properties of the structure, the strength, and stiffness degrading characteristics, the approach used to generate the numerical model and the seismic scenario (target spectrum). While for some scenarios, the dominance of the long record was evident; in other scenarios, the set of short records clearly imposed larger demands than the long record. The detrimental effect of large strong motion durations was mainly observed in relatively rigid structures and poorly detailed flexible structures. The modeling approach was found to play an important role in the perceived effect of duration, with the lumped plasticity multilinear hysteretic models suggesting that the demands from the long records can be up to twice the inferred from distributed plasticity fiber models.

Study on Seismic Behavior of Vertical Connection in Prefabricated Reinforced Concrete Structures

2011 ◽  
Vol 250-253 ◽  
pp. 1385-1394
Author(s):  
Guo Hua Song ◽  
Dong Wei Wang ◽  
Bing Kang Liu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Repeated Loading ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Dowel Action ◽  
Cycle Loading ◽  
Good Agreement

The paper attempts to research the seismic behavior and mechanical mechanisms under repeated low-cycle loading of vertical connections in prefabricated reinforced concrete structures. Eighteen specimens were designed and tested, the test process and the mechanical mechanisms are studied, the seismic behavior of connections is analyzed, and the shear resistance formulas are proposed. The theoretical values based on proposed formulas are good agreement with test results. Under repeated loading, the shear resistance decreases, the connection ductility increases with connecting bar, but decreases with connection width. However, all the connections fail crisply with poor ductility. At sudden-cracking, the shear resistance increases with connecting bar, but changes nonlinearly with connection width. The resistance is composed of attributions of mechanism of diagonal-compressive column (MDCC) and mechanism of compressive friction action (MCFA). After sudden-cracking, the shear resistance is provided by weakened MDCC and dowel action of connecting bars (DACB). It increases with connecting bar and connection width.

scholarly journals Estimation of the pull-off resistance models of reinforced concrete structures by a numerical method

2021 ◽  
Vol 350 ◽  
pp. 00011
Author(s):  
Mikalai Shalabyta ◽  
Elizabeth Matweenko ◽  
Nikifor Matweenko ◽  
Valery Rakhuba
Keyword(s):  
Numerical Modeling ◽  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Strain State ◽  
Numerical Models ◽  
Tensile Force ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
New Information ◽  
Concrete Elements

Comparative analysis of calculations of calculation numerical models for pulling out embedded parts in reinforced concrete structures is carried out. Based on the results of numerical modeling, new information about the stress-strain state in reinforced concrete elements from the local action of the tensile force has been obtained.

scholarly journals DEFLECTION OF FLEXURAL REINFORCED CONCRETE STRUCTURES WITH EXTERNAL NON-METALLIC REINFORCEMENT (EXPERIMENTAL AND THEORETICAL INVESTIGATION)

2002 ◽  
Vol 8 (3) ◽  
pp. 164-168
Author(s):  
Juozas Valivonis
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Investigation ◽  
Concrete Beams ◽  
Theoretical Calculations ◽  
Concrete Structures ◽  
Reinforced Concrete Beams ◽  
Experimental Investigations ◽  
Reinforced Concrete Structures ◽  
Metallic Reinforcement ◽  
Good Agreement

In many cases concrete structures with prestressed steel being sufficiently strong do not meet requirements for stiffness. It is possible to avoid steel prestressing in concrete structures by means of providing additional non-metallic reinforcement, which gives opportunity to increase stiffness of beams significantly. Experimental investigations of reinforced concrete beams with external non-metallic reinforcement were made. Method for calculation of deflection of beams with external non-metallic reinforcement is presented in this article. Theoretical calculations of deflections using the proposed method were performed. Sufficiently good agreement with experimental deflection values was obtained.

Response of R/C Buildings during the 1987 Whittier Narrows Earthquake

1993 ◽  
Vol 9 (1) ◽  
pp. 67-95 ◽  
Author(s):  
Emmanuel Maragakis ◽  
Mehdi Saiidi ◽  
Saber Abdel-Ghaffar
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Strong Motion ◽  
Elastic Response ◽  
Reinforced Concrete Structures ◽  
Structural Members ◽  
Linear Elastic ◽  
Observed Damage ◽  
Comparison Of The Results ◽  
Good Agreement

Strong motion records from several reinforced concrete structures were recovered after the 1987 Whittier, California earthquake. The objective of this paper is to present the highlights of a research study which was performed to review the available data from reinforced concrete buildings, to select representative buildings, and to analyze these buildings using available computer programs for linear analysis. Linear-elastic mathematical models were built for each structure based on the physical properties of the structural members. A comparison of the results of the computer analysis to the available measured responses data showed good agreement for the majority of the buildings studied. Limited studies on the effects of damping variation and soil-structure interaction were performed. The results of this study have led to the conclusion that the linear dynamic analysis can realistically predict the response of reinforced concrete structures subjected to small to moderate earthquakes. The deviations from the elastic response were consistent with the observed damage of the structures during the Whittier earthquake.

Inertial wave dynamics in a rotating and precessing cylinder

1995 ◽  
Vol 303 ◽  
pp. 233-252 ◽  
Author(s):  
J. Jonathan Kobine
Keyword(s):  
Numerical Models ◽  
Primary Objective ◽  
Laser Doppler Velocimeter ◽  
Nonlinear Behaviour ◽  
Viscous Effects ◽  
Wave Dynamics ◽  
Quantitative Measurements ◽  
Linear Behaviour ◽  
Inertial Wave ◽  
Good Agreement

Results are Presented from an experimental study of fluid in a rotating cylinder which was subjected to precessional forcing. The primary objective was to determine the validity of the linear and inviscid approximations which are commonly adopted in numerical models of the problem. A miniature laser Doppler velocimeter was used to make quantitative measurements of the flow dynamics under a variety of forcing conditions. These ranged from impulsive forcing to continuous forcing at the fundamental resonance of the system. Inertial waves were excited in the fluid in each case, with the extent of nonlinear behaviour increasing from one forcing regime to the next. Good agreement was found with the predictions of linear theory in the weaker forcing regimes. For stronger forcing, it was possible to determine the approximate duration of linear behaviour before the onset of nonlinear dynamics. Viscous effects were found to be relatively weak when the frequency of precessional forcing was away from resonance. However, there was evidence of strong boundary-layer phenomena when conditions of resonance were approached.

scholarly journals Numerical-computational analysis of reinforced concrete structures considering the damage, fracture and failure criterion

2013 ◽  
Vol 6 (1) ◽  
pp. 101-120 ◽  
Author(s):  
L. A. F. de Souza ◽  
R. D. Machado
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Numerical Models ◽  
Classical Model ◽  
Concrete Structures ◽  
Constitutive Models ◽  
Reinforced Concrete Structures ◽  
Element Discretization ◽  
Structural Parts ◽  
Elastoplastic Constitutive Model

The experimental results of testing structures or structural parts are limited and, sometimes, difficult to interpret. Thus, the development of mathematical-numerical models is needed to complement the experimental analysis and allow the generalization of results for different structures and types of loading. This article makes two computational studies of reinforced concrete structures problems found in the literature, using the Finite Element Method. In these analyses, the concrete is simulated with the damage classical model proposed by Mazars and the steel by a bilinear elastoplastic constitutive model. Numerical results show the validity of the application of constitutive models which consider the coupling of theories with the technique of finite element discretization in the simulation of linear and two-dimensional reinforced concrete structures.

Sign in / Sign up

Export Citation Format

Share Document