Browsing by Author "Gunatilake, D"

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item: Article-Full-text
Finite element modelling approach to determine optimum dimensions for interlocking concrete blocks used for road paving
(Taylor & Francis, 2019) Gunatilake, D; Mampearachchi, WK
Interlocking concrete block paving (ICBP) is one of the foremost construction methods used in most of the developing countries due to its economic benefits. Although it has emerged as a cost-effective paving material, it is yet being developing as a full-fledged construction technique. The aim of this study was to develop a finite element modelling (FEM) approach to determine optimum dimensions for concrete blocks and to evaluate the deflections and stresses induced in pavements with the application of loads. A three-dimensional FEM was built using the ANSYS FEM software to analyse pavements with different block shapes and laying patterns. Uni 3 block in a herringbone bond pattern induced the lowest deflections and stresses, and therefore the dimensions of Uni 3 block were considered as the optimum dimensions in this analysis. Based on that, a new block shape which incorporated the same behaviour was proposed. Angles 110° and 100° were recommended instead of 137° for the uni-style block shape. Furthermore, the stress and deflection distributions observed in the pavement for a change in the wheel wander indicated significant variations in the stresses when the wheel wander was closer to the pavement edge.
item: Conference-Full-text
Indoor Air Quality (IAQ) Inside a Hospital Theatre
(2014-05-07) Gunaratne, S; Gunatilake, D; Madushanka, R; Perera, M; Jayasinghe, C; Perera, A; Rajapaksa, S
In this research study, the effect of the activities associated with a hospital theatre, on its IAQ has been studied since the theatre staff experience some discomfort while being inside the theatre. In order to evaluate this, variation of Carbon Dioxide (CO2), Carbon Monoxide (CO), Total Volatile Organic Compounds (TVOC) and Particulate Matter less than 2.5 microns (PM2.5) concentrations inside the theatre were measured and analyzed. Significant variations were observed in the concentrations of CO2, TVOC and CO inside the operation theatre. CO2 concentration inside the room increased at the beginning and end of the surgeries due to high occupant density and also during Laparoscopic surgeries. TVOC concentration was affected by the usage of different chemicals during the surgery. Major effect to the CO concentration was by Diathermy.
item: Conference-Full-text
Indoor air quality (IAQ) inside a hospital theatre
(Department of Civil Engineering, University of Moratuwa, 2012-12) Gunaratne, S; Gunatilake, D; Madushanka, R; Perera, TM; Jayasinghe, C; Perera, A; Rajapaksa, S; Nawagamuwa, U; De Silva, LIN
In this research study, the effect Abstract: of the activities associated with a hospital theatre, on its IAQ has been studied since the theatre staff experience some discomfort while being inside the theatre. In order to evaluate this, variation of Carbon Dioxide (CO:), Carbon Monoxide (CO), Total Volatile Organic Compounds (TVOC) and Particulate Matter less than 2.5 microns (PM25) concentrations inside the theatre were measured and analyzed. Significant variations were observed in the concentrations of CO:, TVOC and CO inside the operation theatre. CO2 concentration inside the room increased at the beginning and end of the surgeries due to high occupant density and also during Laparoscopic surgeries. TVOC concentration was affected by the usage of different chemicals during the surgery. Major effect to the CO concentration was by Diathermy.