Abedulgader Baktheer

Abedulgader Baktheer
RWTH Aachen University · Institute of Structural Concrete

Dr.-Ing.

About

27
Publications
8,268
Reads
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181
Citations
Citations since 2017
27 Research Items
181 Citations
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Introduction
Abedulgader Baktheer currently works at the Institut of Structural Concrete, RWTH Aachen University. Abedulgader does research in Structural Engineering and Computational Modeling of Concrete.
Additional affiliations
May 2015 - May 2016
Ruhr-Universität Bochum
Position
  • Student Research Assistant
March 2015 - September 2016
Ruhr-Universität Bochum
Position
  • Student Research Assistant
Education
October 2016 - July 2022
RWTH Aachen University
Field of study
  • Structural Engineering
October 2014 - September 2016
Ruhr-Universität Bochum
Field of study
  • Computational Engineering

Publications

Publications (27)
Article
Full-text available
In this paper, a refined engineering rule for the assessment of remaining fatigue life of concrete under compressive cyclic loading with varying amplitudes is proposed. The rule has been derived based on a combined numerical and experimental investigation of the loading sequence effect. The applied modeling approach is based on a damage model using...
Article
Full-text available
In this paper, combined experimental-numerical investigations of the bond behavior between high-strength concrete and steel reinforcement under monotonic, cyclic and fatigue loading are presented. A modified beam-end test specimen is used to study the bond behavior under push-in compressive loading. The bond length, the concrete strength as well as...
Article
Full-text available
Mathematical modeling of fatigue behavior of concrete under compressive loading presents a challenging topic that attracts an increasing interest of the scientific community. The present paper proposes a new formulation of the microplane model referred to as MS1 aiming to capture the fundamental inelastic mechanisms that can reflect the tri-axial s...
Article
Full-text available
For a reliable and economical design of concrete structures subjected to fatigue loading, a comprehensive understanding and realistic prediction of concrete fatigue life under complex loading scenarios with variable amplitudes is of major concern. In this paper, experimental investigations of concrete behavior under monotonic, cyclic, and fatigue l...
Article
Full-text available
A thermodynamically consistent model proposed in this work introduces a generative symbolic framework for computational components, which can capture the inelastic behavior of interfaces with 3D kinematics in response to monotonic, cyclic, and fatigue loading histories. It contributes to a long list of existing cohesive zone models by introducing n...
Article
Full-text available
The fatigue of concrete has been the subject of research for many years, and yet, there are still open questions. In particular, the fatigue-induced damage evolution accompanied by a stress redistribution process propagating through the concrete structure is still not fully understood. So far, there are only few experimental studies addressing the...
Thesis
Full-text available
In spite of the considerable achievements that have been made in recent years in modeling and characterizing the fatigue behavior of concrete, still many open questions need to be fundamentally addressed in order to gain a deep and general insight into the fatigue phenomenology of concrete. In this thesis, a numerical, theoretical and experimental...
Conference Paper
Full-text available
Structures under repeated loading may fail prematurely due to fatigue of the interface between concrete and reinforcement. In this study, an experimental program is presented studying the bond behavior between normal-strength concrete and steel reinforcement under compressive monotonic and high cycle fatigue loading. Modified beam-end tests have be...
Method
Jupyter notebook showing (i) how to use the Python eco system of packages to symbolically derive the evolution equations from the thermodynamic potentials, i.e. Helmholtz free energy, threshold function and flow potential, (ii) how to transform it to an executable Python code and (iii) how to generate an executable C code that can be included in fi...
Conference Paper
Full-text available
Despite extensive research in the past few decades, design of beams without shear reinforcement is still considered to be a challenging task. With the goal to provide realistic and simple engineering models many researchers have contributed to the development of analytical and numerical approaches that improved our understanding of the mechanical b...
Conference Paper
Full-text available
A cost-efficient yet safe design of reinforced and prestressed concrete structures under fatigue loading is a highly complex and elaborate task. One of the main reasons for this is the still insufficient understanding of the fatigue damage phenomenology of concrete. A promising hypothesis states that the evolution of fatigue damage in concrete at s...
Chapter
Full-text available
In this paper we introduce a consistent constitutive model capturing the behavior of a 3D interface under both monotonic and cyclic loading. The model accounts for the interaction of dissipative effects during a combined decohesion-compression and sliding loading introduced through a smooth cap threshold functionand non-associative flow potential....
Chapter
Full-text available
In several recent mesoscale and macroscale material model formulations, the authors hypothesized that fatigue evolution in the material structure can be realistically modeled by defining a cumulative measure of inelastic shear strain as the fatigue driving mechanism. The standard method of fatigue characterization using cylinder compression tests...
Article
Full-text available
The load scenario with a compressive force applied to an anchored bar (push-in mode) has not been sufficiently addressed so far with reference to fatigue, since most of the studies available in the literature are focused on bond behavior under tensile forces (pull-out mode). However, special structures like the towers of wind turbines subjected to...
Conference Paper
Full-text available
Modeling the fatigue behavior of concrete is a challenging task that has attracted the interest of researchers during the last decades. A new formulation of a microplane fatigue model denoted as MS1 introduced by the authors is employed. It aims to capture the basic inelastic mechanisms that are driving the tri-axial stress redistribution within a...
Conference Paper
Full-text available
Shear load is considered as one of the most important actions in the assessment of reinforced concrete structures. Over the last two decades, significant progress has been made in numerical modelling, with a focus on crack propagation in quasi-brittle materials. It is now generally accepted that complex interaction effects governing the shear crack...
Article
Full-text available
A realistic prediction of the concrete fatigue life exposed to high-cycle loading scenarios with variable amplitudes is of utmost importance for a reliable and economically efficient design of civil engineering infrastructure for transport and energy supply. Current design codes estimate the fatigue life under variable amplitudes using the Palmgren...
Conference Paper
Full-text available
In the last decades, an increasing demand for renewable energy has been stimulating the development of more fatigue resistant wind turbines that can be exposed to millions of load cycles. Bond degradation caused by this high number of load cycles needs to be examined to guarantee the durability and safety of these structures. In this paper, experim...
Article
Full-text available
In this paper an evaluation of existing numerical models for concrete fatigue behavior subjected to compressive loading is presented. The brief review of available modeling approaches is accompanied with their classification based on the postulated fatigue damage hypothesis and on the modeling scale at which the damage is introduced. Based on the r...
Conference Paper
Full-text available
A thermodynamically based microplane fatigue damage model for plain concrete under compressive loading is introduced. The key idea of the present approach is to relate the fatigue damage to a cumulative measure of inelastic sliding/shear strains. Which reflects the fatigue damage accumulation owing to internal friction at subcritical fatigue loadin...
Conference Paper
Full-text available
In this paper, we combine experimental and numerical investigations of the bond fatigue behavior between concrete and reinforcement. A modified Beam-End-Test specimen has been used to study the bond behavior under monotonic and fatigue push-in loading. Moreover, a numerical modeling approach of bond fatigue developed by the authors has been used to...
Conference Paper
Full-text available
In this paper, a combined numerical and experimental investigations have been conducted to study the order effect of the concrete fatigue behavior. Two different fatigue modeling approaches from the literature have been implemented and used in this study. The first approach is based on the concept of "equal damage for equal work". Where the fatigue...
Conference Paper
Full-text available
In this paper, we introduce a thermodynamic based microplane fatigue damage model for plain concrete. The key idea of this approach is to relate the fatigue damage to a cumulative measure of inelastic sliding/shear strains. Which reflects the fatigue damage accumulation owing to internal friction under subcritical fatigue loading. The model is form...
Conference Paper
Full-text available
Realistic characterization of fatigue loading resistance is a paramount for an economical and reliable structural design of reinforced concrete (RC) and prestressed concrete (PC) structures. The need for innovative experimental methods for the characterization of fatigue behavior is driven by the current aims to construct wind turbine towers that m...
Article
Full-text available
In this paper we introduce a thermodynamically consistent bond-interface pressure-sensitive damage model with cumulative sliding strain measure as a fundamental source of fatigue damage. The modeling approach provides a clear physical interpretation of the dissipative mechanisms governing the propagation of fatigue damage within the concrete-steel/...
Conference Paper
Full-text available
In this paper we introduce a thermodynamically consistent bond-interface pressure-sensitive damage model with cumulative sliding strain measure as a fundamental source of fatigue damage. The modeling approach provides a clear physical interpretation of the dissipative mechanisms governing the propagation of fatigue damage within the concrete-steel...

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Projects

Projects (5)
Project
Resistance to cyclic loading is a fundamental component of the efficient and reliable structural design of traffic and power generation infrastructure made of concrete and reinforced concrete. Despite remarkable progress in recent years made in modeling and characterizing the concrete fatigue behavior, many open questions remain that need to be fundamentally addressed in order to develop a deep and general insight into the phenomenology of concrete fatigue. In this research proposal, the thermodynamic-based multi-scale fatigue modeling platform jointly developed by the project partners is used as a springboard to address three crucial issues affecting the fatigue behavior of concrete: (1) stochastic nature of loading and heterogeneous material structure, (2) time- and rate-dependent material response, and (3) thermomechanical interaction of dissipative mechanisms with fatigue loading. The theoretical and numerical developments will be validated by a systematic experimental program. The developed characterization methods will provide the basis for the improvement of engineering codes.
Project
A thermodynamical framework for fatigue behavior of interface will be formulated and applied using mesoscale discrete models of reinforced concrete in connection with an efficient adaptive time-stepping algorithm enabling simulation of high-cycle fatigue. Models will be applied to structural design. Bilateral project supported by Czech Science Foundation GC19-06684J and GermanScience Foundation (DFG)