INELASTIC COLLAPSE ANALYSIS OF REINFORCED CONCRETE FRAMED STRUCTURES USING THE HYBRID STRESS FINITE ELEMENTS

A numerical model using the Finite Element Method (FEM) for the nonlinear static and dynamic analysis of reinforced concrete (RC) beams, plates and shells is presented in this work. For this purpose, computer programs based on plasticity theory and with crack monitoring capabilities are developed. The static analysis of RC shells up to failure load is carried out using 9-node degenerated shell finite elements while 20-node brick finite elements are used for dynamic applications. The elasto-plastic constitutive law for concrete is coupled with a strain-rate sensitive model in order to take into account high loading rate effect when transient loading is intended. The implicit Newmark scheme with predictor and corrector phases is used for time integration of the nonlinear system of equations. In both cases, the steel reinforcement is considered to be smeared and represented by membrane finite elements. Various benchmark examples are solved with the present numerical model and comparisons with other published data are performed. For all examples, the path failure, collapse loads and failure mechanism is reproduced with great accuracy.

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A bi-dissipative damage model for concrete

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952015000100006 ◽

2015 ◽

Vol 8 (1) ◽

pp. 49-65

Author(s):

J. J. C. Pituba ◽

W. M. Pereira Júnior

Keyword(s):

Reinforced Concrete ◽

Structural Engineering ◽

Damage Mechanics ◽

Damage Model ◽

Continuum Damage Mechanics ◽

Concrete Material ◽

Framed Structures ◽

Energy Equivalence ◽

Proposed Model ◽

Damage Processes

This work deals with an improvement of an anisotropic damage model in order to analyze reinforced concrete structures submitted to reversal loading. The original constitutive model is based on the fundamental hypothesis of energy equivalence between real and continuous media following the concepts of the Continuum Damage Mechanics. The concrete is assumed as an initial elastic isotropic medium presenting anisotropy, permanent strains and bimodularity induced by damage evolution. In order to take into account the bimodularity, two damage tensors governing the rigidity in tension or compression regimes are introduced. However, the original model is not capable to simulate the influence of the previous damage processes in compression regimes. In order to avoid this problem, some conditions are introduced to simulate the damage unilateral effect. It has noted that the damage model is agreement with to micromechanical theory conditions when dealing to unilateral effect in concrete material. Finally, the proposed model is applied in the analyses of reinforced concrete framed structures submitted to reversal loading. These numerical applications show the good performance of the model and its potentialities to simulate practical problems in structural engineering.

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Damage detection on reinforced concrete framed structures using a band-variable filter

Research and Applications in Structural Engineering, Mechanics and Computation ◽

10.1201/b15963-417 ◽

2013 ◽

pp. 859-860

Keyword(s):

Reinforced Concrete ◽

Damage Detection ◽

Framed Structures

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Modeling reinforced concrete structures using coupling finite elements for discrete representation of reinforcements

Finite Elements in Analysis and Design ◽

10.1016/j.finel.2018.06.004 ◽

2018 ◽

Vol 149 ◽

pp. 32-44 ◽

Cited By ~ 6

Author(s):

Luís A.G. Bitencourt ◽

Osvaldo L. Manzoli ◽

Yasmin T. Trindade ◽

Eduardo A. Rodrigues ◽

Daniel Dias-da-Costa

Keyword(s):

Reinforced Concrete ◽

Finite Elements ◽

Concrete Structures ◽

Reinforced Concrete Structures ◽

Discrete Representation

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Damage to reinforced concrete buildings caused by the July 22, 1967 earthquake in Turkey

Bulletin of the Seismological Society of America ◽

10.1785/bssa0590020631 ◽

1969 ◽

Vol 59 (2) ◽

pp. 631-650

Author(s):

Safak Z. Uzsoy ◽

Uğur Ersoy

Keyword(s):

Reinforced Concrete ◽

Reinforced Concrete Buildings ◽

Framed Structures ◽

Concrete Buildings ◽

Observed Damage ◽

Construction Practice

abstract An attempt is made to analyze the damage caused to reinforced concrete-framed structures in the towns of İzmit and Adapazarı by the Mudurnu Valley earthquake of July 22, 1967. The observed damage shows that elaborate calculations for the design of structures to withstand earthquake forces are of little use unless they are based upon sound concepts, proper details, and are carried out by construction practice of good quality.

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Design Optimization of Fibres Reinforced Concrete Railway Tracks by Using Non-linear Finite Elements Analysis

10.1007/978-981-16-7160-9_11 ◽

2021 ◽

pp. 117-125

Author(s):

J. L. Tailhan ◽

P. Rossi

Keyword(s):

Reinforced Concrete ◽

Finite Elements ◽

Design Optimization ◽

Finite Elements Analysis ◽

Railway Tracks ◽

Non Linear

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Calculation of Reinforced Concrete Prismatic Shells by the Finite Element Method Using Variable Elasticity Parameters

Materials Science Forum ◽

10.4028/www.scientific.net/msf.945.969 ◽

2019 ◽

Vol 945 ◽

pp. 969-974

Author(s):

V. Kruglov ◽

V. Iurchenko

Keyword(s):

Finite Element ◽

Reinforced Concrete ◽

Finite Elements ◽

Concrete Slab ◽

Volume Ratio ◽

High Strength ◽

Finite Elements Method ◽

Software Module ◽

Reinforced Concrete Slab ◽

Elastic Characteristics

The paper considers the modification of the generally accepted formulation of the finite elements method by applying in the calculation I.Mileykovski’s refined technical theory of shells that takes into account the deformations of the transverse shear along the thickness of the model. When applying this solution path, it is possible to calculate thick and thin shells (plates) with equal efficiency, taking into account the complex strained state of an anisotropic material. It illustrates the inclusion in the computational algorithm of variable parameters of the elasticity of concrete, allowing more accurate evaluation of the stress-strain state in the finite element under complex (combined) loads. The presence of reinforcement in the material is modeled by dividing the structure into layers and sequentially reduction the elastic characteristics of the material based on the volume ratio of the components. The advantage of the algorithm is the ease of its integration with the conventional finite elements method. All transformations in this case consist in the modification of expressions for determining the elastic characteristics of the construction, calculating the gradient and stiffness matrices, while the sequence of further calculations does not change. This enables to use the proposed algorithm, including as a plug-in software module, expanding the capabilities of existing computing programs. The article demonstrates the application of the method in modeling a reinforced concrete slab made with the use of multi-component high-strength concrete of a heavy class having a prismatic strength under uniaxial compression of more than 110 MPa.

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