Investigations on the influence of radial confinement in the impact response of concrete

Yousef Al-Salloum,Saleh Alsayed,Tarek Almusallam,S.M. Ibrahim,H. Abbas 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.14 No.6

Annular and solid concrete specimens with different aspect ratios and static unconfined compressive strengths were studied for impact loading using SHPB test setup. Numerical simulations in LSDYNA were also carried out and results were validated. The stress-strain curves obtained under dynamic loading were also compared with static compressive tests. The mode of failure of concrete specimen was a typical ductile failure at high strain rates. In general, the dynamic increase factor (DIF) of thin solid specimens was higher than thick samples. In the numerical study, the variation of axial, hydrostatic and radial stresses for solid and annular samples was studied. The core phenomenon due to confinement was observed for solid samples wherein the applied loads were primarily borne by the innermost concrete zone rather than the outer peripheral zone. In the annular samples, especially with large diameter inside hole, the distribution of stresses was relatively uniform along the radial distance. Qualitatively, only a small change in the distribution of stresses for annular samples with different internal diameters studied was observed.

Prediction of compressive strength of concrete using neural networks

Yousef A. Al-Salloum,Abid A. Shah,Saleh H. Alsayed,Tarek H. Almusallam,M.S. Al-Haddad,H. Abbas 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.10 No.2

This research deals with the prediction of compressive strength of normal and high strength concrete using neural networks. The compressive strength was modeled as a function of eight variables: quantities of cement, fine aggregate, coarse aggregate, micro-silica, water and super-plasticizer, maximum size of coarse aggregate, fineness modulus of fine aggregate. Two networks, one using raw variables and another using grouped dimensionless variables were constructed, trained and tested using available experimental data, covering a large range of concrete compressive strengths. The neural network models were compared with regression models. The neural networks based model gave high prediction accuracy and the results demonstrated that the use of neural networks in assessing compressive strength of concrete is both practical and beneficial. The performance of model using the grouped dimensionless variables is better than the prediction using raw variables.

Attitude towards an Advertisement Translated for the Lebanese Market: Between Adaptation and Censorship

Franck Barbin,Sawsan SALLOUM 서울대학교 외국어교육연구소 2014 외국어교육연구 Vol.- No.-

We studied censorship in Lebanese advertising and the role played by translators. To avoid offending consumers, adapting a text often means prior censorship conducted by the translator before publication or post censorship imposed by the authorities after publication. By analyzing an advertisement having an implicitly sexual message, we tried to show the extent to which this advertisement could offend Lebanese people and would therefore need to be censored. We based our work on an attitude survey which was conducted among Lebanese women and also interviewed experts in advertising. The participants were asked to give an aesthetic and moral judgment on the advertisement and to suggest changes to the image and the message. The different levels of acceptance enabled us to draw a typology of consumers which was then linked to the choices made by the translators. Our study proved that censorship is more a question of personal judgment than religion.

Behavior of FRP‑Strengthened RC Beams with Large Rectangular Web Openings in Flexure Zones

Tarek Almusallam,Yousef Al?Salloum,Hussein Elsanadedy,Abdulhafiz Alshenawy,Rizwan Iqbal 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.5

This paper aims to investigate the behavior of fiber reinforced polymer (FRP) strengthened reinforced concrete (RC) beams containing large rectangular web openings in the flexure zone. Studied parameters were type of loading, opening size and strengthening scheme. Seven RC beams categorized into two different groups were tested. In the first group, two unstrengthened beams (one solid without opening and one with large rectangular web opening in the pure flexure zone) were tested under four-point bending. In the second group, five beams were tested under center-point loading. They comprised of one reference solid beam and four beams with large rectangular web opening in the maximum-moment region. Out of the four beams with openings, two specimens were unstrengthened and the other two were strengthened with two different FRP schemes. A numerical study was also conducted and the results of analysis were validated with experiments. The calibrated analysis was then used for some useful parametric studies in which the effect of different parameters was investigated.

Surveillance Study of Acute Gastroenteritis Etiologies in Hospitalized Children in South Lebanon (SAGE study)

Ghssein, Ghassan,Salami, Ali,Salloum, Lamis,Chedid, Pia,Joumaa, Wissam H,Fakih, Hadi The Korean Society of Pediatric Gastroenterology 2018 Pediatric gastroenterology, hepatology & nutrition Vol.21 No.3

Purpose: Acute gastroenteritis (AGE) is a major cause of morbidity and remains a major cause of hospitalization. Following the Syrian refugee crisis and insufficient clean water in the region, this study reviews the etiological and epidemiological data in Lebanon. Methods: We prospectively analyzed demographic, clinical and routine laboratory data of 198 children from the age of 1 month to 10 years old who were admitted with the diagnosis of AGE to a private tertiary care hospital located in the district of Nabatieh in south Lebanon. Results: Males had a higher incidence of AGE (57.1%). Pathogens were detected in 57.6% (n=114) of admitted patients, among them single pathogens were found in 51.0% (n=101) of cases that consisted of: Entamoeba histolytica 26.3% (n=52), rotavirus 18.7% (n=37), adenovirus 6.1% (n=12) and mixed co-pathogens found in 6.6% (n=13). Breast-fed children were significantly less prone to rotavirus (p=0.041). Moreover, children who had received the rotavirus vaccine were significantly less prone to rotavirus (p=0.032). Conclusion: Our findings highlight the high prevalence of E. histolytica infection as the major cause of pediatric gastroenteritis in hospitalized children, during the summer period likely reflecting the insanitary water supplies and lack of hygiene. Moreover the 42.4% of unidentified causative pathogens should prompt us to widen our diagnostic laboratory arsenal by adopting new diagnostic technologies.

Post-Heating Response of Concrete-Filled Circular Steel Columns

Husain Abbas,Yousef Al-Salloum,Saleh Alsayed,Mohammed Alhaddad,Rizwan Iqbal 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.4

Concrete-Filled Steel Tubular (CFST) columns are increasingly becoming popular for carrying heavy loads. One of the major concerns for such columns has always been the exposure to fire and subsequent cooling for which different methods are adopted. This study investigates the effect of cooling regimes after exposure to elevated temperature of 600oC for three hours on axial compression behavior of concrete-filled circular stub columns. The experimental program involves the testing of thirty columns consisting of two sizes of outer steel tube. Double skin columns were also considered for the bigger diameter column. The cooling regimes considered in the study were annealing and water quenching. The columns were tested for two possible modes of load transfer viz. core loaded and composite loaded. The behavior of columns was studied in terms of ultimate load capacity, loaddeformation pattern and stresses in the materials. The ductility of concrete-filled columns was higher than that of the steel tube alone. The confinement offered by outer steel tube was less in composite loaded columns as compared to core loaded columns. The annealing was found to be slightly better than water quenching for post-fire cooling of columns.

Prediction of Punching Shear Strength of HSC Interior Slab-Column Connections

Hussein M. Elsanadedy,Yousef A. Al-Salloum,Saleh H. Alsayed 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.2

Flat plate systems are widely used in reinforced concrete structures. Using of high-strength concrete has been common recently. In the current international codes of practice for concrete structures, the design methods for assessment of punching shear capacity are based on experimental data of flat plates with Normal-Strength Concrete (NSC). The aim of this research is to come up with new formula for punching shear resistance, consistent with data of flat plates made from High-Strength Concrete (HSC). Test results of 61HSC interior slab-column connection specimens were collected from the literature. The available test results were not only compared with current code provisions but with equations proposed by other researchers as well. A new formula for predicting punching shear strength of HSC interior slab-column connections is proposed. An innovative design equation is also suggested.

Surveillance Study of Acute Gastroenteritis Etiologies in Hospitalized Children in South Lebanon (SAGE study)

Ghassan Ghssein,Ali Salami,Lamis Salloum,Pia Chedid,Wissam H Joumaa,Hadi Fakih 대한소아소화기영양학회 2018 Pediatric gastroenterology, hepatology & nutrition Vol.21 No.3

Purpose: Acute gastroenteritis (AGE) is a major cause of morbidity and remains a major cause of hospitalization. Following the Syrian refugee crisis and insufficient clean water in the region, this study reviews the etiological and epidemiological data in Lebanon.Methods: We prospectively analyzed demographic, clinical and routine laboratory data of 198 children from the age of 1 month to 10 years old who were admitted with the diagnosis of AGE to a private tertiary care hospital located in the district of Nabatieh in south Lebanon.Results: Males had a higher incidence of AGE (57.1%). Pathogens were detected in 57.6% (n=114) of admitted pa-tients, among them single pathogens were found in 51.0% (n=101) of cases that consisted of: Entamoeba histolytica26.3% (n=52), rotavirus 18.7% (n=37), adenovirus 6.1% (n=12) and mixed co-pathogens found in 6.6% (n=13). Breast-fed children were significantly less prone to rotavirus (p=0.041). Moreover, children who had received the rota-virus vaccine were significantly less prone to rotavirus (p=0.032).Conclusion: Our findings highlight the high prevalence of E. histolytica infection as the major cause of pediatric gastro-enteritis in hospitalized children, during the summer period likely reflecting the insanitary water supplies and lack of hygiene. Moreover the 42.4% of unidentified causative pathogens should prompt us to widen our diagnostic laboratory arsenal by adopting new diagnostic technologies.

Reliability Assessment of HFRC Slabs Against Projectile Impact

Nadeem A. Siddiqui,Yousef A. Al?Salloum,Tarek H. Almusallam,Aref A. Abadel,Husain Abbas 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.6

In the present study, a probabilistic procedure is presented for estimating the reliability of hybrid fiber reinforced concrete (HFRC) slabs against the impact of hemispherical nose projectiles considering uncertainties involved in the material, geometric and impact parameters. The influence of hybrid fibers in improving the safety level of reinforced concrete slabs against impact loads has also been studied on a parametric basis. The failure of the HFRC slabs was assumed to occur when the impact velocity of the projectile exceeds the ballistic limit of the slab i.e. perforates the slab. To illustrate the procedure, a probabilistic analysis was carried out on the impact test results of HFRC slabs containing different proportions of hooked-end steel, polypropylene and Kevlar fibers, recently published by the authors. Reliability assessment was performed for a range of applied nominal impact loads by varying the impact velocity of the given projectile. Reliability analysis yields the safety level of all the HFRC slabs against the impact of the above projectile. Effect of fibers, especially steel fibers, and slab thickness on the reliability of HFRC slabs are also investigated on a parametric basis.

Primary leiomyosarcoma of the liver: Two new cases and a systematic review

Francesco Esposito,Chetana Lim,Laurence Baranes,Chady Salloum,Cyrille Feray,Julien Calderaro,Daniel Azoulay 한국간담췌외과학회 2020 Annals of hepato-biliary-pancreatic surgery Vol.24 No.1

Primary hepatic leiomyosarcoma (PHL) is a rare malignant tumor, which originates from smooth muscles. Clinical presentation and imaging features are non-specific and can mimick the most frequent primary liver tumors namely hepatocellular carcinoma and intrahepatic cholangiocarcinoma. We report here two cases of PHL including one from the portal vein. The literature was searched for studies reporting cases of PHL reported from 2011 and 2019. The two patients were operated with R0 resection. Diagnosis of PHL was confirmed by histopathological and immunohistochemical examinations. Surgery remains the mainstay of the management of PHL. R0 resection is the main prognostic factor. Our literature search identified 16 additional cases from 12 reports. Preoperative diagnosis of PHL needs a high degree of suspicion due to atypical clinical presentation and non-specific imaging features. Surgery is the mainstay of the management of PHL. R0 resection is the main prognostic factor.