Seismic Assessment of a 5-Storey Retrofitted Rc Building

Bark, Hussein; Markou, George; Mourlas, Christos; Papadrakakis, Manolis

doi:10.7712/100016.2302.16740

Cited by 3 publications

(2 citation statements)

References 5 publications

(4 reference statements)

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“…In the literature, it is stated that this model is particularly suited for structural engineering NLFEA. Demonstrations of the computational efficiency and comparisons to commercially available algorithms can be found in the literature (Bark, Markou, Mourlas, and Papadrakakis, 2016;Markou, Sabouni, Suleiman, and El-Chouli, 2015;Markou and Papadrakakis, 2013;.…”

Section: Introductionmentioning

confidence: 99%

Non-linear finite element analyses applicable for the design of large reinforced concrete structures

Engen

Hendriks

Øverli

et al. 2017

European Journal of Environmental and Civil Engineering

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In order to make non-linear finite element analyses applicable during assessments of the ultimate load capacity or the structural reliability of large reinforced concrete structures, there is need for an efficient solution strategy with a low modelling uncertainty. A solution strategy comprises choices regarding force equilibrium, kinematic compatibility and constitutive relations. This contribution demonstrates four important steps in the process of developing a proper solution strategy: 1) definition, 2) verification by numerical experiments, 3) validation by benchmark analyses and 4) demonstration of applicability. A complete solution strategy is presented in detail, including a fully triaxial material model for concrete, which was adapted to facilitate its implementation in a standard finite element software. Insignificant sensitivity to finite element discretization, load step size, iteration method and convergence tolerance were found by numerical experiments. A low modelling uncertainty, denoted by the ratio of experimental to predicted capacity, was found by comparing the results from a range of experiments to results from non-linear finite element predictions. The applicability to large reinforced concrete structures is demonstrated by an analysis of an offshore concrete shell structure.

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Section: Introductionmentioning

confidence: 99%

Non-linear finite element analyses applicable for the design of large reinforced concrete structures

Engen

Hendriks

Øverli

et al. 2017

European Journal of Environmental and Civil Engineering

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“…Many simplified models have been developed for the simulation of RC structural members under ultimate limit state and cyclic loading conditions with moderate success. The accuracy limitations of these numerical models is well documented thus researchers turned towards more detailed 3D approaches (Kotsovos and Pavlovic, 1995;Hartl, 2002;Lykidis and Spiliopoulos, 2008;Červenka and Papanikolaou, 2008;Papanikolaou and Kappos, 2009;Markou and Papadrakakis, 2013;Ali et al, 2016, Mourlas et al, 2017 in an attempt to develop accurate and robust modeling methods that will be able to predict the mechanical response of any RC structural member or structure. These research studies adopt the use of hexahedral elements that treat cracks through the use of the smeared crack approach and model rebars as embedded rod or beam finite elements.…”

Section: Introductionmentioning

confidence: 99%

Computationally Efficient and Robust Nonlinear 3D Cyclic Modeling of RC Structures Through a Hybrid Finite Element Model (HYMOD)

Markou

Mourlas

Papadrakakis

2018

Int. J. Comput. Methods

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A computationally efficient and robust simulation method is presented in this work, for the cyclic modeling of reinforced concrete (RC) structures. The proposed hybrid modeling (HYMOD) approach alleviates numerical limitations regarding the excessive computational cost during the cyclic analysis and provides a tool for the detailed simulation of the 3D cyclic nonlinear behavior of full-scale RC structures. The simplified HYMOD approach is integrated in this work with a computationally efficient cyclic concrete material model so as to investigate its numerical performance under extreme cyclic loading conditions. The proposed approach adopts a hybrid modeling concept that combines hexahedral and beam-column finite elements (FEs), in which the coupling between them is achieved through the implementation of kinematic constraints. A parametric investigation is performed through the use of the Del Toro Rivera frame joint and two RC frames with a shear wall. The proposed modeling method managed to decrease the computational cost in all numerical tests performed in this work, while it induced additional numerical stability during the cyclic analysis, in which the required number of internal iterations per displacement increment was found to be always smaller compared with the unreduced (hexahedral) model. The HYMOD provides for the first time with the required 3D detailed FE solution tools in order to simulate the nonlinear cyclic response of full-scale RC structures without hindering the numerical accuracy of the derived model nor the need of developing computationally expensive models that practically cannot be solved through the use of standard computer systems.

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Simplified HYMOD non-linear simulations of a full-scale multistory retrofitted RC structure that undergoes multiple cyclic excitations – An infill RC wall retrofitting study

Markou

Mourlas

Bark

et al. 2018

Engineering Structures

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Having the ability to assess the earthquake resistance of retrofitted reinforced concrete (RC) structures through accurate and objective nonlinear cyclic analysis is of great importance for both scientists and professional Civil Engineers. Full-scale RC structure simulations under ultimate limit state cyclic loading conditions through the use of 3D detail modeling techniques, is currently one of the most challenging modeling tasks that any research or commercial software can undertake. The excessive computational demand and the numerical instabilities that occur when dealing with this type of cyclic nonlinear numerical analysis, make this modeling approach impractical. The simplified hybrid modeling (HYMOD) approach is adopted in this work, which overcomes the above numerical limitations and it is used herein to illustrate the capabilities of the method in capturing the experimental results of a full-scale 4-storey RC building that was retrofitted with RC infill walls and carbon fiber reinforced polymer jacketing. This work has the aim to investigate the importance of numerically accounting for the damage that has developed at the concrete and steel domains during the analysis of problems that foresee consecutive cyclic loading tests. Based on the numerical findings, it was concluded that the proposed modeling approach was able to accurately capture the experimental data and predict the capacity degradation of the building specimen. Furthermore, the proposed method was used to numerically investigate different retrofitting configurations that foresaw the use of infill RC walls. The numerical experiments performed in this work demonstrate that the proposed modeling approach provides with the ability to study the cyclic mechanical behavior of full-scale RC structures under ultimate limit state conditions, thus paves the way in performing additional parametric investigations in determining the optimum retrofitting design of RC structures by using different types of interventions.

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Seismic Assessment of a 5-Storey Retrofitted Rc Building

Abstract: Abstract. Due to severe damages on structures caused by earthquakes different approaches

Cited by 3 publications

References 5 publications

Non-linear finite element analyses applicable for the design of large reinforced concrete structures

Non-linear finite element analyses applicable for the design of large reinforced concrete structures

Computationally Efficient and Robust Nonlinear 3D Cyclic Modeling of RC Structures Through a Hybrid Finite Element Model (HYMOD)

Simplified HYMOD non-linear simulations of a full-scale multistory retrofitted RC structure that undergoes multiple cyclic excitations – An infill RC wall retrofitting study

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