Mohamed Said

Mohamed Said
Benha University · Department of Civil Engineering (Faculty of Engineering at Shoubra)

Professor

About

36
Publications
11,101
Reads
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392
Citations
Citations since 2017
23 Research Items
358 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100

Publications

Publications (36)
Article
The shear performance of T-shaped reinforced concrete (RC) deep beams with openings and subjected to several loading types was numerically investigated; and compared with existing experimental results. The studied parameters included flange dimensions, shear span-to-depth ratio, concrete strength, size and location of openings, VL and HZ stirrups r...
Article
Full-text available
The current study aims to assess the shear behaviour of reinforced mortar beams including Polyvinyl Alcohol Fibre (PVA) ranges from 0 to 2.25%, fly ash (55%) and silica fume (15%). Fourteen beams were experimentally tested under two concentrated loads. In addition, a finite element model was developed to predict the crack pattern, load–deflection,...
Article
Full-text available
The use of fibres of different sizes are needed to improve the control of multi-level cracking of reinforced concrete (RC). There are several studies of the use of hybrid fibres for this purpose, however, there is limited work on the finite element modelling (FEM) of fibres in crack arresting of RC beams. In this study, fifteen RC beams containing...
Article
This paper investigates the strengthening techniques of lightweight concrete (LWC) flat slabs vulnerable to punching shear failure. Thirteen reinforced LWC flat slab specimens were experimentally tested. The main investigated parameters were the type of shear reinforcement (steel bars, high strength bolts, or glass fiber reinforced polymers (GFRP)...
Article
Full-text available
The behavior of axially loaded columns constructed from recycled coarse aggregates (RCA) was studied. Two different concrete mixes with varying ratios of RCA (0, 20, 40 and 60%) are conducted to achieve a compressive strength of 35 MPa. The test variables include the two different mixtures and replacement ratio of RCA. The results of specimens with...
Article
This paper investigates the flexural performance of engineered cementitious composite (ECC) concrete beams reinforced with innovative hybrid bars. Hybrid bars combine the advantages of both FRP and steel bars in enhancing the ultimate strength, ductility, and corrosion resistance compared with pure FRP or steel bars. Twelve half-scale ECC-concrete...
Article
The experimental program of this study consisted of 12 slab specimens. The parameters investigated include ratio of reinforcement in compression and tension, amount of shear reinforcement and arrangement of shear reinforcement. Flexural reinforcement ratio especially in tension had a noticeable effect on the mode of failure and ultimate punching ca...
Conference Paper
Full-text available
This paper aims at investigating the parameters that affect strengthening of Steel Square Hollow Sections (SHS) and Rectangular Hollow Sections (RHS) against local buckling failure using CFRP sheets or strips. To obtain maximum capacity axial centric load of the section, parameters and cases that affect the percentage of strength enhancement provid...
Conference Paper
Full-text available
Provision of openings in serviceable reinforced concrete beams may result in a substantial decline in the beam's capacity and integrity; pointing out the necessity of opening strengthening. The present study investigates the response of reinforced concrete T-beams with strengthened openings disposed in shear span. The experimental program consisted...
Article
Twelve half-scale concrete beams were tested to investigate the flexural performance of concrete beams reinforced with locally produced hybrid bars and hybrid schemes. The variables are the reinforcement bar type (hybrid, GFRP, and steel) and the reinforcement ratios (0.85%, 1.26%, 1.70%, 1.8, and 2.13%). The test results showed a significant enhan...
Article
Full-text available
Analytical parametric study to investigate the influence of Light-Weight Concert strength, the arrangement, type, yield strength and amount of shear reinforcement steel, tensional and compressive reinforcement steel ratios and the use of steel fiber as shear reinforcement in punching shear behavior of Light-Weight Concrete flat slabs was establishe...
Article
Full-text available
Polyvinyl Alcohol (PVA) fiber was developed more than 80 years ago in Japan. They are heavily used in non-structural applications and in Engineered Cementitious Composites (ECC) mainly for beams and thin slabs sections. There are gaps in the research regarding their performance in other structural elements and at elevated temperatures. The aim of t...
Article
Full-text available
Thirteen specimens were experimentally tested under single midspan concentrated loads to study the shear behavior of lightweight concrete (LWC) and normal weight concrete (NWC) deep beams with web openings. In this research, the term LWC refers to the concrete obtained by partially replacing aggregate by polystyrene foam balls not the concrete cont...
Article
h i g h l i g h t s Performance of concrete beams with Engineered Cementitious Composites ECC. Variable volume fractions of (PVA) and (PP) fibers were used. ECC materials exhibits an improvement in ductility. Load carrying capacity is more significant for using PVA rather than PP. Non-linear finite element analyses were performed and assessed with...
Article
Full-text available
A non-linear finite-element analysis model was developed to predict the strength of high-strength concrete (HSC) slender columns. The studied parameters were compressive strength, load eccentricity, slenderness ratio and longitudinal and transverse reinforcement ratio. The model results were verified by comparison with analytical results and experi...
Article
Full-text available
Engineered cementitious composites (ECC) are ultra-ductile fiber-reinforced composites. The tensile strain capacity of ECC is about 200-500 times that of ordinary concrete. This ultra-ductility is a consequence to the tight multiple cracking under tensile forces resulting from incorporating random micro-fibers. This paper investigates the fresh pro...
Article
Engineered Cementitious Composites (ECC) considers a type of ultra-ductile cementitious composites with fiber reinforcement. It is developed for applications for economic purpose in the construction industry. ECC characterizes by strain hardening and multiple cracking. This paper experimentally investigates the performance of ECC concrete beams rei...
Article
Full-text available
This paper aims to study the seismic performance of exterior beam-column joints in building frames strengthened by ferrocement using nonlinear finite element analysis. Firstly, the proposed model was used to predict experimental results successfully. Secondly, a parametric study was carried out to assess the behavior of such joints with different a...
Article
Full-text available
A model for the strength analysis of high-strength concrete (HSC) columns subjected to eccentric loading is proposed. The model is based on a stability analysis of pin-ended columns using the theoretical sinusoidal equation for the deflected shape of the column. The reduction in column stiffness as the axial load increases, representing the basic c...
Article
Full-text available
This paper presents numerical study analysis and the results of confined masonry walls. The studied parameters were number of bays, number of stories, and openings of walls. It was showed that the window opening could reduce the lateral capacity of the solid by ranges of 7-27% for one bay wall, 6-30% for two bay walls, and 11-26% for three bays wal...
Article
Full-text available
The self-compacting concrete (SCC) is the newest innovating category of high performance concrete. The shear behavior of Fiber Reinforced Self-Compacted Concrete (FRSCC) deep beams was investigated. The experimental program consisted of twelve simply supported beams tested up to failure under four-point load. The key parameters covered in this inve...
Article
This paper presents an experimental and analytical study on the shear behavior of concrete beams reinforced with lab produced glass fiber reinforced polymers (GFRP) bars and stirrups. The bars and stirrups are manufactured by double parts die mold using local resources raw materials at lab. A total of ten beams measuring 120 mm wide, 300 mm deep an...
Article
Full-text available
This paper presents an implementation of a three-dimensional nonlinear finite element model for evaluating the behavior of reinforced concrete slabs under centric load. The concrete was idealized by using eight-nodded solid elements. While flexural reinforcement and the shear were modeled as line elements, a perfected bond between solid elements an...
Article
This paper presents the results of in-plane cyclic loading tests conducted on confined masonry walls retrofitted using low-cost ferrocement and GFRP systems. Ten wall assemblies with a 0.80-scale were built, consisting of a clay masonry panel, two confining columns and a tie beam. The assemblies were tested under a combination of a vertical load an...
Article
Full-text available
Glass fiber reinforced polymers (GFRP) reinforcement bars has a lower stiffness than steel reinforcement, which should be accounted for the ultimate and serviceability conditions, including the impact on member deflection and crack widths. This paper presents an experimental study of the flexural behavior of concrete beams reinforced with locally p...
Article
Full-text available
The shear behavior of reinforced concrete wide beams was investigated. The experimental program consisted of nine beams of 29 MPa concrete strength tested with a shear span-depth ratio equal to 3.0. One of the tested beams had no web reinforcement as a control specimen. The flexure mode of failure was secured for all of the specimens to allow for s...
Article
Full-text available
The main objective of the current research is to establish experimental data for minimum flexural reinforcement, ρmin, of high strength concrete (HSC) rectangular beams. Nine full-scale singly reinforced beams with flexural reinforcement ratios varying from 50% to 100% of the minimum limit specified by the ACI 363R-35 were tested in flexure. Concre...
Article
The behavior of high strength concrete colu mns; HSCC with steel fibers under cyclic loading was investigated. Fourteen half-scale column specimens were tested under cyclic lateral load. The key variables covered in this investigation include the steel fibers ratio ranging from 0.00% to 1.50%. The concrete st rength varied from 50 MPa to 100 MPa. T...

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Projects (10)
Project
Recently studies are performed to improve the structural behaviour of reinforced concrete (RC) structures. As an alternative reinforcing material to the steel reinforcement, fibre-reinforced polymer (FRP) bars is being considered due to their corrosion resistance characteristic, so the FRP bar has received considerable attention. In addition to the noncorrosive nature of the FRP materials, they also have a high strength-to-weight ratio. However, the brittleness of FRP greatly reduces the ductility of FRP- reinforced concrete (FRPRC) beams. In order to improve its flexural ductility, and at the same time retain the high strength feature of the FRP bars, it is proposed that steel longitudinal reinforcement should be added to form a hybrid FRPRC beam. Another technique to enhance the flexural ductility of RC beams is using engineered cementitious composites. Engineered Cementitious Composite (ECC), also called strain hardening cement-based composites (SHCC) or more popularly as bendable concrete, is an easily molded mortar-based composite reinforced with specially selected short random fibers, usually polymer fibers. Unlike regular concrete, ECC has a strain capacity in the range of 3–7% compared to 0.1% for concrete. So, if the steel bars or FRP bars or hybrid bars are used in concrete structures containing ECC as a flexural reinforcement, some advantages can be expected, but researches for the hybrid reinforced concrete structures containing ECC are very limited to date. Reference to the previous researches, the hybrid FRPRC beams behave in a more ductile manner when compared with the FRPRC beams. This study will investigate the behaviour of hybrid reinforced concrete beams containing ECC under flexural loading. The main variables that will be considered in this study are the type of concrete, volume of fibers, tension reinforcement steel ratio, FRP reinforcement ratio, hybrid reinforcement schemes. The flexural parameters that will be investigated are cracking load, ultimate load, reinforcement strain, crack width, ductility, deflection and failure modes.
Project
Goal: All Dear Colleagues – Collaborators and Their Laboratories are invited to attach to this project Their old, new, and future works or messages about any type of "Stability of Beams, Frames, and Trusses", i.e. elements, often thin-walled, losing their stability when are loaded not axially (like columns) but in a transverse plane to the elements' axes ... ... if any RSGate Member wants to be added to the project as the Collaborator (at least a co/authorship of one work about the "Stability of Beams, Frames and Trusses" would be required), He needs to be a follower of a member ... , sorry ... , but in another way, the system of the project doesn't recognize Him, and He can't be added ... , ... if any Dear Colleague–Collaborator of the project wants to add other Colleagues, which work on the "Stability of Beams, Frames and Trusses" (at least the co/authorship of one work about the "Stability of Beams" would be required) ... - don't hesitate to invite them ... The main rules of our Project are as follows: 1. every Colleague–Collaborator of our Project should attach at least 1 work about "Stability of Beams, Frames, and Trusses" or a message about it, 2. every Colleague–Collaborator of our Project should follow each other, 3. every Colleague–Collaborator of our Project should read and recommend, if only would be so possibility regarding a scientific level of researches, all works with each other, 4. every Colleague–Collaborator of our Project should comment works to each other if only would be a reason to do that - comments naturally may be critical but with respect to authors, 5. every Colleague–Collaborator of our Project should cite each other - if only would be so possibility regarding research works of each one, i.e. in every new work attached to our Project should be cited a big number, e.g. 100 works of Collaborators of our Project, 6. every Colleague–Collaborator of our Project should collaborate and write common (with the Collaborators as co-authors) papers, books, ... and other kinds of works, if only would be so possibility, 7. if any Colleague–Collaborator of our Project has a possibility to help to publish works (e.g. as a member of a scientific journal or publishing house editorial board) should give massage about it in the "goal of the project" or in "updates" in our Project, 8. if any Colleague–Collaborator knows about a conference with "Stability of Beams, Frames, and Trusses" as a panel or topic - He should inform us in the "goal of the project" or in "updates" in our Project ... I hope that the above rules of our Project would help us to get success in our scientific work ... , every one of us would like that His work would be noted, read, recommended, commented, discussed and cited ... , but somebody should do that ... All Dear Colleagues – Collaborators are invited to be added to the Stability of Structures’s Lab regarding the rules of the Lab: https://www.researchgate.net/lab/Stability-of-Structuress-Lab-Krzysztof-Murawski Faithfully Yours Krzysztof Murawski
Project
All Dear Colleagues–Collaborators and Their Laboratories are invited to attach to this project Their old, new, and future works or messages about the stability of plates, shells (cylindrical, spheral, conical, et cetera ... shells), and panels made of metals, composites, concrete, bricks (masonry), wood, et cetera ... in elastic, elastic-plastic and plastic states ... ... if any RSGate Member wants to be added to the project as the Collaborator (at least a co/authorship of one work about the "Stability of Plates" would be required), He needs to be a follower of a member ... , sorry ... , but in another way, the system of the project doesn't recognize Him, and He can't be added ... , ... if any Dear Colleague–Collaborator of the Project wants to add other Colleagues, which work on the stability (at least the co/authorship of one work about the "Stability of Plates" would be required) ... - don't hesitate to invite them ... The main rules of our Project are as follows: 1. every Colleague–Collaborator of our Project should attach at least 1 work about "Stability of Plates" or a message about it, 2. every Colleague–Collaborator of our Project should follow each other, 3. every Colleague–Collaborator of our Project should read and recommend, if only would be so possibility regarding a scientific level of researches, all works with each other, 4. every Colleague–Collaborator of our Project should comment works to each other if only would be a reason to do that - comments naturally may be critical but with respect to authors, 5. every Colleague–Collaborator of our Project should cite each other - if only would be so possibility regarding research works of each one, i.e. in every new work attached to our Project should be cited a big number, e.g. 100 works of Collaborators of our Project, 6. every Colleague–Collaborator of our Project should collaborate and write common (with the Collaborators as co-authors) papers, books, ... and other kinds of works, if only would be so possibility, 7. if any Colleague–Collaborator of our Project has a possibility to help to publish works (e.g. as a member of a scientific journal or publishing house editorial board) should give massage about it in the "goal of the project" or in "updates" in our Project, 8. if any Colleague–Collaborator knows about a conference with "Stability of Plates" as a panel or topic - He should inform us in the "goal of the project" or in "updates" in our Project ... I hope that the above rules of our Project would help us to get success in our scientific work ... , every one of us would like that His work would be noted, read, recommended, commented, discussed, and cited ... , but somebody should do that ... All Dear Colleagues – Collaborators are invited to be added to the Stability of Structures’s Lab regarding the rules of the Lab: https://www.researchgate.net/lab/Stability-of-Structuress-Lab-Krzysztof-Murawski Faithfully Yours Krzysztof Murawski