Papers by Mohammed Ayman
Engineering Failure Analysis, 2020
In this paper and based on a previous work, a parametric study was executed to capture the crucia... more In this paper and based on a previous work, a parametric study was executed to capture the crucial parameters that affect the response of reinforced concrete beams, whether the thermal response or the structural response. The aim behind the used methodology from the previous work was reaching a reliable algorithm that has the capability to simulate any reinforced concrete element under both mechanical and fire loads. This algorithm is based on connecting thermal analysis and structural analysis with coupling technique called sequential coupling technique. This technique allow taking into consideration the non-linearity for thermal material properties such as conductivity, specific heat, and density, and also the non-linearity for mechanical properties such as stress-strain relationship, and thermal expansion coefficient, beside the nonlinearity for concrete compressive strength, and rebar ultimate strength. This algorithm is achieved through detailed numerical finite element models using ANSYS program. The main parameters that had been studied in this paper are the effect of increasing concrete compressive strength, increasing concrete cover, and the effect of increasing the lateral stiffness of the beam on the total response.
2ND INTERNATIONAL CONFERENCE ON STRUCTURAL SAFETY UNDER FIRE & BLAST LOADING CONFAB 2017, 2017
Structural deterioration and collapse during major fire is evident and recorded every year in man... more Structural deterioration and collapse during major fire is evident and recorded every year in many incidents. Such events lead to severe injuries and deaths in addition to major economic loss of property. Research efforts to accurately predict the effect of fire on the structural safety and performance and to identify ways to mitigate such effect have been increasing recently with the increase in the capital investment in buildings and infrastructure sectors. In this paper we are seeking to reach a reliable algorithm to simulate a reinforced concrete beams under both mechanical and fire loads. The proposed algorithm is performed based on connecting thermal analysis and structural analysis using a sequential coupling technique. These analyses involve non-linearity of both thermal and structural properties such as conductivity, specific heat, stress-strain relationship, and thermal expansion in order to capture the thermal and mechanical response during both heating and cooling phases. The proposed algorithm is achieved through detailed numerical finite element models utilizing ANSYS program. The numerical results of the proposed methodology are verified against those of published experimental work. In that work, two beams were tested. The first one failed durin was exposed to different fire scenario, so it was cooled and reloaded to evaluate the residual capacity. The results of the numerical model showed good correlation with the experimental results in both thermal and mechanical responses indicating the efficiency of the numerical model and its applicability to be used in further parametric studies.
Books by Mohammed Ayman
This Book is intended to give an illuminating presentation on simulating structural realistic pro... more This Book is intended to give an illuminating presentation on simulating structural realistic problems using ABAQUS. The problem definition and configuration for the first two examples of this book are taken from ABAQUS manual to give the reader the opportunity to compare results, and also illustrate the ideal modeling algorithm according to manual, then the same modeling concept and procedures are used through the book for a group of comprehensive structural problems, beside the detailed explanation for the new needed tools according to each problem, accompanied by ABAQUS manual explanation if needed.
To give the desired complete understanding for structural simulation and ABAQUS tools, the book is started with the most simplified examples, and then the level of complexity is increased gradually. This book will be published in the form of parts, each part focus on a specific topics, that are explained through a detailed group of problems.
Thesis Chapters by Mohammed Ayman
Cairo University , 2018
Structural deterioration and collapse during major fire is evident and recorded in many incidents... more Structural deterioration and collapse during major fire is evident and recorded in many incidents. Such events lead to severe injuries and deaths in addition to major economic loss of property. Research efforts to accurately predict the effect of fire on the structural safety and performance and to identify ways to mitigate such effect has been increasing recently with the increase in the capital investment in buildings and infrastructure sectors. In this thesis the main objective is reaching a reliable algorithm to simulate a reinforced concrete beams under both mechanical and fire loads. The proposed algorithm is performed based on connecting thermal analysis and structural analysis using a sequential coupling technique. These analyses involves non-linearity of both thermal and structural properties such as conductivity, specific heat, stress-strain relationship, thermal expansion to capture the thermal and mechanical response during both heating and cooling phases. The proposed algorithm is achieved through detailed numerical finite element models utilizing ANSYS program. The numerical results of the proposed methodology is verified against that of published experimental work. In that work, two beams were tested. The first one failed during fire where the fire resistance was evaluated in minutes. The second one didn’t fail during fire as it exposed to different fire scenario, so it was cooled and reloaded to evaluate the residual capacity. The results of the numerical model showed good correlation with the experimental results in both thermal and mechanical responses indicating the efficiency of the numerical model. This algorithm of creating the coupled numerical model, is then used to execute parametric study, for establishing the effect of some parameters on beam thermal and structural responses to fire loads.
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Papers by Mohammed Ayman
Books by Mohammed Ayman
To give the desired complete understanding for structural simulation and ABAQUS tools, the book is started with the most simplified examples, and then the level of complexity is increased gradually. This book will be published in the form of parts, each part focus on a specific topics, that are explained through a detailed group of problems.
Thesis Chapters by Mohammed Ayman
To give the desired complete understanding for structural simulation and ABAQUS tools, the book is started with the most simplified examples, and then the level of complexity is increased gradually. This book will be published in the form of parts, each part focus on a specific topics, that are explained through a detailed group of problems.