Structural Engineering Commons^™

Assessment Of Safety Monitoring Indexes Of High Rcc Gravity Dams Considering Hydraulic Fracture, Mohamed Ramdan, Jinsheng Jia Professor, Xu Li Professor

Journal of Engineering Research

High concrete gravity dams, particularly Roller-Compacted Concrete (RCC) types, face long-term safety challenges due to weak interlayer formation and crack propagation. This study presents a comprehensive evaluation of safety monitoring indexes for the Guxian high RCC dam (currently under construction in China) using both numerical and theoretical models. A Finite Element Method (FEM) was applied with two approaches: the strength reduction method, which considers weak layers, and the overloading method, which simulates extreme loading without accounting for material degradation. A comparative analysis between these two methods was conducted to determine which more effectively evaluates dam safety under varying conditions. Additionally, …

Flexural Behavior Of Sustainable Concrete Beams Containing Waste Tire Fibers And Recycled Aggregates, Wael M. Montaser Ass.Prof

Journal of Engineering Research

The increasing accumulation of diverse waste materials poses a significant societal challenge, highlighting the importance of developing methods to reuse such waste effectively. One promising solution involves incorporating recycled coarse aggregate (RCA) obtained from demolished concrete into new concrete mixtures. Additionally, tire-derived fibers (TDF), sourced from recycled tires, present an environmentally friendly substitute for conventional reinforcement materials. The integration of RCA with TDF in reinforced concrete beams offers a sustainable approach to enhancing structural performance. This experimental study investigates the flexural performance of reinforced concrete beams containing recycled coarse aggregate (RCA) and tire-derived fibers (TDF). Four mixes with varying RCA …

The Influence And Firing Of Zircon, Ilmenite, And Magnetite As Partial Sand Replacement On The Properties Of Concrete For Specialized Applications., Samy A. Fawzy

Journal of Engineering Research

This study investigates the impact of partially replacing sand with varying percentages (10%, 20%, 30%, and 50%) of zircon (ZrSiO4), ilmenite (FeTiO3), and magnetite (Fe3O4) on the physical and mechanical properties of concrete. The research focuses on evaluating the compressive strength, density and radiation shielding capabilities of the modified concrete mixtures. The effect of firing concrete cubes(600,900 and 1100 C) with various percentages of the three materials were studied also. The use of these heavy minerals aims to enhance concrete properties for specialized applications such as radiation shielding structures and high-density construction. Results indicate that increasing the replacement percentage of …

Machine Learning-Based Prediction Of Load Capacity In Corrugated Concrete-Filled Double Skin Tubes Under Axial Load, Aya Mohsen Handousa Mansoura University, Fikry Salem, Nabil Mahmoud Mahmoud, Mohamed Ghannam

Journal of Engineering Research

Concrete-filled double-skin steel tubular (CFDST) columns have become widely utilized in building construction and bridges, thanks to their exceptional structural capabilities. This study investigates the axial compression behavior of corrugated CFDST columns, analyzing the impact of flat or corrugated external/internal plates and varying internal steel tube widths. Furthermore, basic regression analysis fails to precisely forecast the complicated relation between the column properties and their compressive strength. To overcome these challenges, this study suggests two machine learning (ML) models, including the Gaussian process (GPR) and the extreme gradient boosting model (XGBoost). To estimate their strength, these models employ a range of …

A Comprehensive Review Of Carbonation In Supplementary Cementitious Concrete: Factors Affecting, Measurement Methods, And Challenges, Mariam Farouk Ghazy, Metwally Abd Allah Abd Elaty, Esraa Samir Abdeljalil

Journal of Engineering Research

Abstract-After water, concrete is the most widely used material on the planet. Accelerated carbonation treatment is an effective approach of reducing carbon emission in the concrete industry. Such carbonation process converts gaseous CO2 into carbonated minerals. This review provided a special focus on internal and external variables affecting carbonation depth. Internal variables such as mixture components, External variables such as adding pozzolanic materials such as fly ash, and slag were examined systematically, temperature, pressure, and CO2 concentration. The effect of accelerated carbonation curing on the compressive strength of concrete at early ages, both positive and negative influences were identified. …

Structural Performance Of Corrugated Steel Plate Shear Walls, Eyad Ayman Bakry, M. F. Hassanein, Ayman Seleemah

Journal of Engineering Research

Abstract- Corrugated Steel Plate Shear Walls (CoSW) represent a groundbreaking advancement in structural engineering, providing exceptional seismic resilience, energy dissipation, and lateral stiffness compared to traditional flat steel plate shear walls. This paper offers a comprehensive review of CoSW performance under various conditions, including cyclic and seismic loads, with a focus on enhancing geometric configurations and reinforcement techniques. Key innovations such as enhanced corrugation angles, stiffener integration, and strategically designed openings are discussed. Recent progress in computational modeling and experimental validation has further refined design methodologies, ensuring their practical applicability. The review highlights that critical parameters such as corrugation depth, …

Numerical Investigation Of Thermal Effects On Concrete Bridges: Insights From Frame And Shell Modeling, Mohamed Ibrahim Metwally Dr., Mohamed A. El Zareef Prof.

Journal of Engineering Research

Bridges are essential structural components of transportation networks, and their performance is significantly influenced by temperature variations. Thermal expansion and contraction can induce stresses that affect structural stability, necessitating accurate modeling techniques for design and maintenance. This study investigates the thermal behavior of a three-span continuous box girder bridge using two different numerical modeling approaches: the Frame Element model and the Shell Element model. The research evaluates the effects of uniform temperature conditions (20°C) and a temperature gradient of ±5°C, focusing on bending moments, normal forces, and fiber stresses. Results indicate that the Shell Element model predicts bending moments and …

Finite Element Modeling Of Newly Developed Cold-Formed Hollow Flanged Z-Beams, Mohammed Ahmed Diab, Mohamed Saeed Refaey, Hanan Eltobgy

Journal of Engineering Research

Cold-formed hollow flanged sections (CFHFS) are considered an innovative advancement in cold-formed steel design. These sections offer large lateral torsional rigidity over the open cold-formed section resulting in enhanced flexural capacity. This paper introduces a numerical study on the section moment capacity of newly developed cold-formed hollow flanged Z-beams (CFHFZBs). CFHFZBs can be easily constructed in the Egyptian market by welding an industrially available main Z-element to two secondary Z-elements to form the hollow flange. This paper presents the finite element modeling of sixteen CFHFZBs in a four-point bending arrangement using ABAQUS software. To obtain verified finite element models (FEMs), …

Experimental Investigation Of Multi-Cell Column Foun-Dations Under Bending Loads, Mostafa Abdo Abdllah Sharp

Journal of Engineering Research

This study investigates the structural behavior of connections between multi-cell columns and foundations under bending loads. The term "multi-cell" refers to sections with multiple longitudinal hollow cores separated by thin webs. A total of eight specimens were modeled and analyzed using the finite element software ABAQUS/CAE [1], under a single loading line system until failure. To facilitate this study, a control specimen was created as a benchmark, enabling the assessment of various parameters' impact on the connection. These parameters include embedment depth, the number of cells in the column, the presence of shear studs, internal plates, and concrete infill within …

The Performance Of Different Systems In Resisting Seismic Loading For High Rise Concrete Structures, Samy A. Fawzy

Journal of Engineering Research

High-rise buildings are subjected to gravity and mostly lateral loading from seismic and wind loads that affect the behavior of such structures. In this study, we will deal with the seismic behavior of different concrete systems. Moment resisting frame, Shear wall, global bracing and dual system are used in this study. A 3D model in static and dynamic analysis was done using ETABS software then a pushover analysis and a parametric study as well for different systems. The study proved that the case of moment resisting frame is the worst in resisting displacements and drift as well. Although the model …

Numerical Analysis Of Cold-Formed Built-Up Battened Steel Columns Under Eccentric Compressive Loading, Mai Mohamed Sheta, Hanan Hussein Eltobgy, Mohamed Massoud El Saadawy, Khaled Abdallah Gharib

Journal of Engineering Research

This paper presents a 3D finite element model simulation using ABAQUS finite element software to investigate the behavior of steel battened beam columns under uniaxial loads. The columns consist of double-channel cold-formed slender open sections. The study highlighted the effects of various factors on the ultimate capacity of these beam-column members.

By considering both global and local imperfections, the model focuses on the structural strength and performance of battened cold-formed steel columns made from built-up sections. These cold-formed steel (CFS) columns have a slenderness ratio ranging from 50 to 162. Axial loads are applied at the pin-ended support of the …

Non-Linear Analysis Of Axially Loaded Built-Up Open Section Cold-Formed Columns, Mai Mohamed Sheta, Hanan Hussein Eltobgy, Mohamed Massoud El Saadawy, Khaled Abdallah Gharib

Journal of Engineering Research

Built-up open cold-formed sections are commonly used in entrances, structural corners, and window frames. These elements exhibit low torsional stiffness and are highly susceptible to cross-sectional deformation. Battened built-up cold-formed steel (CFS) open columns offer enhanced load-carrying capacity when individual profiles cannot withstand applied loads.

Extensive research has focused on understanding the buckling behavior of these structural elements. However, limited studies have explored the impact of spacing between cold-formed C-channel sections. Existing research suggests that battened columns with adequately spaced members exhibit superior structural performance compared to those with closely spaced channels.

A critical factor affecting the performance of battened …

Numerical Study For Strengthening Hexagonal Castellated Steel Beams Using Hexagonal Ring Stiffeners, Amany M. Morad, Omnia F. Kharoub, Nashwa Yossef

Journal of Engineering Research

This paper investigates numerically how the castellated steel beams are affected by the addition of hexagonal stiffeners around hexagonal web openings. Increasing the CSBs' load-bearing capacity and improving their overall structural behavior are the main objectives of this strengthening technique. Although there are different failure modes as a result of castellation, the main emphasis of this study is web post-buckling. Using ABAQUS software, a 3D finite element model is created to analyze the beam's behavior. The model's accuracy was validated by comparing its results with those from previous experimental studies. Failure loads, failure modes, and load-deflection curves of CSBs are …

Optimization Of The Cross-Section Of Generic Flexible Bridges, Manal Kamal Zaki, Mina M. Helmy, Mark M. Tawadros

Journal of Engineering Research

This paper investigates the behavior of flexible bridges prone to aerodynamic instabilities due to wind. Optimal cross-sections that reduce aerodynamic forces are recommended. This is achieved by studying a variety of bridge sections with different widths of upper and lower sloping edges in addition to studying the upper and lower cramps of the deck. The wind velocities are also parameterized. Computations are developed based on the powerful computational fluid dynamics (CFD) method known as FLUENT and embedded in ANSYS software. For parametric study, a design of experiments (DOE) is performed based on the response surface methodology (RSM) combined with the …

Preliminary Spectral Matching Analysis Of The Rod El-Farag Region In Cairo, Egypt, Ahmed F. Youssef, Amr Z. Elkady, Ayman A. Seleemah

Journal of Engineering Research

Abstract: Earthquake engineering assessments are essential for evaluating the seismic response of structures. Nonlinear dynamic analysis is a highly effective method for evaluating seismic re-sponse, considering the complex, three-dimensional, and dynamic behaviour of structures during earthquakes. The complexity of seismic damage assessment arises from ground motion and struc-tural modelling parameters. Spectral matching is a key method in seismic codes and aids in selecting earthquake accelerograms for performance- and force-based designs. Spectrum-matched data is increasingly used to estimate nonlinear structural responses. Spec-tral matching utilizes the wavelet adjustments introduced by Abra-hamson (1992) and refined by Hancock et al. (2006) to adjust earth-quake …

Optimizing And Validation Of Sustainable Uhpc With Waste Glass Powder Utilizing Modified Particle Packing Approach And Response Surface Methodology, Mohamed Taman, Elsaid Maaty, Alaa Mehrez, Ahmed Kamal Isaac

Journal of Engineering Research

The current study explores the potential of utilizing Waste glass powder (WGP) as an alternative to cement in the development of sustainable eco-friendly Ultra-high-performance concrete (UHPC). UHPC mixtures underwent optimization through the application of a Modified Andreasen and Andersen (MAA) particle packing model, resulting in a reduction of cement content from 900 to 800 kg/m³. Six mixes were cast, with varying levels of cement replacement ratios with WGP up to 50%. The evaluation focuses on the flowability, dry density, and mechanical properties of UHPC at different ages using normal curing. A statistical model utilizing response surface methodology (RSM) …

Investigating The Influence Of Confinement Stress And Concrete Type On The Performance Of Precast Segmental Dry Shear-Keyed Joints, Khaled Ramzy, Mahmoud Ahmed Abdel Aziz Mohammed

Journal of Engineering Research

This investigative research delves into the correlation between dry joint ultimate load and varied applied confinement stress levels – low at 2 MPa, moderate at 4 MPa, and high at 6 MPa – within structural joints. The focus is on diverse configurations of shear key quantities (single, dual, and triple shear keys) within these joints. Additionally, an examination was conducted on the influence of concrete types –Normal Strength Concrete (NSC) rated at 30 MPa, High Strength Concrete (HSC) at 60 MPa, and Ultra-High Strength Concrete (UHSC) at 120 MPa – alongside the aforementioned confinement stress levels on load capacity. The …

Influence Of Concrete Jacketing On The Performance Of Steel Columns Under Blast Induced Progressive Collapse, Hanan Eltobgy Prof., Mohamed Saeed Refaey Dr., Mohamed Ahmed Aboshok Dr., Ahmed Emadel-Din Abdel-Aal Eng.

Journal of Engineering Research

This study investigates the influence of concrete jacketing on the performance of steel columns subjected to blast loading, which can lead to progressive collapse. Using Finite Element Method (FEM) simulations, the research evaluates concrete-encased steel columns with different concrete cover thicknesses to measure their resistance to lateral displacements induced by blasts. Findings reveal that increasing the thickness of the concrete cover markedly improves the column's ability to withstand such loads. The study also highlights that steel has better energy dissipation properties than concrete. It examines how the combined challenges of progressive collapse and blast loading influence the overall structural response …

Experimental Investigation Of Light-Weight Concrete-Filled Stainless Steel Tube Composite Long Columns, Nadia Fath Alla, Kamel Kandeel, Mahmoud El-Nagar

Journal of Engineering Research

The main target of this study is to investigate the behavior and performance of long composite circular stainless steel columns filled with light-weight concrete. An experimental study was carried out on four specimens, two of them are long composite circular stainless steel columns with length 1400 mm, diameter 100 mm and thickness of stainless steel tube 2 mm filled with light-weight and normal concrete with strengths 12 and 26 mpa respectively, which denoted by C1400/12 and C1400/26. The other two specimens are short composite circular stainless steel columns with length 500 mm, diameter 100 mm and thickness of stainless steel …

Numerical Study For The Behavior Of Stainless-Steel Sigma Columns Under Axial Compression Load, Hayat H. Hegazy, Nashwa M. Yossef Prof, Mostafa F. Hassanein

Journal of Engineering Research

This study investigated numerically the behavior of slender austenitic stainless-steel grade EN 1.4420 columns under compression loads. The column has a single lipped Sigma cross section. The finite element model was developed using ABAQUS software, then it was validated by comparing its results against outcomes from a previous experimental study. A parametric study conducted on pin-ended Sigma columns explores the effect of various factors on ultimate strength and failure modes, such as thickness (t) and flange width (B). Results indicate that as the thickness of the column increases, so does its ultimate load capacity. Thicker columns …

Experimental Study On Fiber Reinforced Concrete (Frc) Beams With Splices, Mohie Eldin Salah Shoukry, Ahmed Mokhtar Tarabia, Nabil Youssef Nabil

Journal of Engineering Research

This paper presents the results of an experimental study involving nine simply supported beams featuring lap-spliced bars within the constant moment zone. All beams shared identical reinforcement details, including three longitudinal reinforcement bars (12 mm diameter) and two top reinforcement bars (8 mm diameter) for shear stirrup hanging. The lap-spliced specimens were created with a splice length of thirty times the bar diameter (360 mm). The study focused on two key parameters: the fiber content of hooked-end steel fibers used in the concrete mix and the presence of stirrups in the lap-splice region. The hooked-end steel fiber used was with …

Effect Of Corrugation Properties On The Flexural Behavior Of Small-Scale Mono-Symmetric Steel Girders With Corrugated Webs, Ahmed Elgendy, Ahmed M. El Hadidy, Dr. Mahmoud Hassan Elboghdadi

Journal of Engineering Research

Steel girders with corrugated webs have been extensively researched and used in a variety of applications during the last few decades, including bridges and industrial buildings. Many studies explored the behavior of double symmetric girders with corrugated webs, but only a few articles used unequal flanges. Furthermore, the majority of research focuses on large-scale girders such as bridge girders, with just a few publications considering small-scale girders that may be employed in traditional construction applications. Additionally, performed investigations that consider the flexural behavior focused their studies on the effect of varying the dimensions of flanges without considering the effect of …

Finite Element Investigation For The Flexural Behavior Of Small-Scale Mono-Symmetric Steel Girders With Corrugated Webs, Ahmed H. Elgendy, Ahmed M. El Hadidy, Dr. Mahmoud Hassan Elboghdadi

Journal of Engineering Research

In the last decades, steel girders with corrugated webs have been widely investigated and implemented in many applications such as bridges and industrial facilities. Many researchers investigated the flexural behavior of traditional doubly symmetric girders with corrugated webs, but a very limited number of investigations considered the usage of unequal flanges. In addition, for most cases the performed investigations focus on the behavior of large-scale girders similar to bridge girders, while few papers considered small-scale girders that could be used in traditional structures. Thus, the objective of this paper is to investigate the lateral torsional buckling behavior of small-scale unsymmetric …

Exemplary Studies On The Torsional Response Of Single Pile In Contaminated Sand, Ahmed Nasr, Waseim Azzam, Nada Ramadan

Journal of Engineering Research

Deep foundations, including piles, are employed in types of coastal soil because the soil in such regions may be subjected to several variables that alter the engineering features of the soil, like oil contamination. Together with the loads caused by supported superstructures, the pile foundations may also be susceptible to torsional loads from eccentric, horizontal loads brought on by winds, earthquakes, ship accidents, and waves. Tests have been conducted in this laboratory investigation to examine the behavior of piles under torsional load (T) in polluted sandy soil. Also, tests investigated how the Lp/Dp ratio affected the piles' bearing capacity. Details …