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This research aims towards presenting an appropriate model for analyzing reinforced concrete (RC) beams repaired and strengthened using jackets of cementitious materials.The jackets incorporated chemically activated fly ash with glass fiber to enhance the load carrying capacity, cracking load and ductility at normal temperature and after exposed to elevated temperature. Three-dimensional nonlinear finite element (FE) model has been developed using finite element package, ANSYS 14.0. Eleven RC beams strengthened using plain or RC jackets containing activated fly ash and glass fibers and loaded with four-point loading arrangement were analyzed. The parameters of the study comprised damage level induced before jacketing, effect of exposure to elevated temperature and effect of jacket reinforcement. The finite element results obtained in this investigation; ultimate flexural capacity, mid-span deflection, crack progression, failure mode and stresses in concrete, showed good agreement when compared with the available experimental data results. The presented FE models showed the potential of performing numerical simulation instead of experimental tests to save time and costs.

Widespread dissemination of carbapenem-producing Klebsiella pneumoniae (KPC) is of major concern in healthcare settings. Resistance to carbapenems involves multiple mechanisms such as the production of carbapenemases, impermeability of outer membrane and efflux pump mechanism. Objective: The aim of this study was to evaluate the prevalence of carbapenemase-producing K. pneumoniae strains among various clinical specimens obtained from different wards and to detect KPC as a mechanism of resistance. Methodology: 100 samples (55urine and 45sputum) were collected from outpatients and inpatients attending urology and chest departments in Beni Suef University Hospital aiming to isolate K. pneumoniae during the period of December 2016 to January 2018. The isolates were tested for susceptibility to ertapenem using E test. Resistant isolates were subjected to phenotypic detection of carbapenemase production by Modified Hodge Test (MHT) and molecular assessment of KPC gene by PCR. Phylogentic tree analysis was used to detect their relationship by DNA sequencing reaction. Results: K.pneumoniae were isolated from 31(31%) of the samples taken. Out of them 19(61.8%) were resistant to ertapenem by E test. By phenotypic method,17/19 (89.4%) were positive for carbapenemase by MHT; and only 13 out of them (76.4%) were confirmed as KPC by PCR. Conclusion: High rate of carbapenem-resistance in K.pneumoniae by both phenotypic and molecular methods was observed. These results warrant more firm infection control measures along with a strictly implemented antibiotic stewardship program to prevent their spread.