Browsing by Author "Morawaka, UD"

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    item: Thesis-Abstract
    Constraints implementation of PPP urban development infrastructure projects
    (2024) Morawaka, UD; Hadiwattege, C
    Urban development infrastructure projects are vital as they can facilitate significant benefits to society. As a result of the struggling economies of developing countries Public-Private Partnerships (PPPs) have been identified as a key strategic policy to deliver public infrastructure facilities. PPPs facilitate the private sector to get involved with financing, designing, building, operating, maintaining and management of projects. However, Sri Lanka is still struggling to implement PPP urban development infrastructure projects due to institutional constraints. This study focuses on investigating the constraints of the public sector for better implementation of PPP urban development infrastructure projects. From this study, it was critically reviewed the use of PPP by the public sector with special reference to urban development infrastructure projects and explained the PPP coverage on infrastructure projects in Sri Lanka. Further, it explicated the government's institutional barriers to better implementation of PPP projects through a comprehensive literature review. Considering these institutional barriers, a study was carried out in the Urban Development Authority (UDA), Sri Lanka to appraise the challenges that the UDA is facing for better implementation of PPP infrastructure projects. Descriptive statistics were used to analyse the empirical data acquired from a questionnaire survey from both inside and outside 32 professionals who closely worked with PPP infrastructure projects of UDA. The studies revealed six main areas and 38 subareas of barriers for better implementation of infrastructure PPP projects. The main areas are Project Feasibility, Procurement Method, Risk Allocation, Managing Social Barriers, Continuous Involvement and Support from the Government Staff. In the context of UDA, Managing Social Barriers and Support from the UDA staff were appraised as the most challenging sectors. Finally, the findings identified the main constraints for better implementation of PPP urban development infrastructure projects. Keywords: Urban Development Infrastructure Projects, Public-Private Partnerships, Urban Development Authority, government institutional barriers
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    item: Conference-Full-text
    Traffic induced vibration analysis of existing steel bridge in Padeniya-Anuradhapura Road
    (Department of Civil Engineering, University of Moratuwa, 2011-12) Kodikara, KATL; Morawaka, UD; GunathiIake, IAPMP; Lewanagamage, CS; Ratnayake, N
    The Bridge which is located in Padeniya-Abstract: Anuradhapura road is a steel truss bridge with three spans of approximately 31m long. It is currently undergoing a development process which includes constructing a new cantilever pedestrian walkway of 1.5m in length of either side of the bridge. Because of this proposed cantilever foot walk static as well as dynamic loading will be changed. In order to ensure that the structure is safe under the additional loads, structural analysis was carried out for static condition as well as for dynamic condition to check the adequacy of structural elements.Analyses of the bridge under static and dynamic loading were done by the finite element (FE) method. The bridge model is such that the structural steel is idealized by beam elements and the deck is represented by shear flexible shell elements. The support with elastomeric bearings is idealized by using an internal element with linear springs. Modelling was carried out using commercial FE software package SAP2000. Based on the results of finite element analysis this paper suggests the effectiveness of using elastomeric bearings for enhancing vibration serviceability hence expanding life span of steel truss bridges.
  • Thumbnail Image
    item: Conference-Abstract
    Traffic induced vibration analysis of existing steel bridge in Padeniya-Anuradhapura road
    (2011) Kodikara, KATL; Morawaka, UD; Gunathilake, IAPMP; Lewanagamage, CS
    The selected Bridge which is located in Padeniya-Anuradhapura road is a steel truss bridge with three spans of approximately 31m long. It is currently undergoing a development process which includes constructing a new cantilever pedestrian walkway of 1.5 m in width of either side of the bridge. Because of this proposed cantilever foot walk static as welt as dynamic loading will be changed. In order to ensure that the structure is safe under the additional loads structural analysis uwr carried out for static condition as well as for dynamic condition and check the adequacy of structural elements. Analyses of the bridge under static and dynamic loading were done by the finite element (FE) method. The bridge model is such that the structural steel is idealized by beam elements and the deck is represented by shear flexible shell elements. The support with elastomeric bearings is idealized by using an internal element with linear springs. Modeling was carried out using commercial FE software package SAP2000. Structural Analysis revealed that there is a kind of a vibration problem exists. As a solution for this vibration problem, this paper suggests the effectiveness of using elastomeric bearings hence expanding life span of steel truss bridges.