Browsing by Author "Shanaka, KBK"

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    item: Conference-Extended-Abstract
    A Study on present situation, construction procedures, sensitivity towards the fill height and possible failure scenarios of corrugated soil-steel bridges using PLAXIS
    (2010) Gunathilaka, WMS; Shanaka, KBK; Lewangamage, CS; Jayasinghe, MTR
    The Southern Highway Project introduced the technology of using Soil-Steel Bridges to Sri Lankan construction industry for the first time. Because of the fact that the technology is still new and less familiar, therefore, it is very important to look at the suitability of the Soil-Steel structures in the Sri Lankan context. The corrugated Sail-Steel Bridges hare been used as underpass and drainage structures in the Southern Highway Project. Corrosion of the metal structure highly depends on the soil types and the ground water conditions of the region where the structure is to be constructed. Already constructed soil-steel structures were closely examined in-order to collect the information on corrosion The loading and unloading procedures given in the guidelines are questionable and there is a need to establish proper guidelines for loading and unloading process for the safety during construction and while the structure is functioning. The actual construction sequence followed in the soil-steel structure construction was modelled using Finite Element Computer Modelling and the stresses and deformations of the structure were obtained. The stresses of the steel structure under different fill heights and the HA loading was also modelled using Unite element computer modelling: Using FEM model, possible failure scenarios n ere identified.
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    item: Conference-Extended-Abstract
    A study on structural behaviour of corrugated soil-steel bridge structure (long span) in Southern highway for different depth of soil cover
    (2010) Shanaka, KBK; Gunathilaka, WAS; Lewangamage, CS; Jayasinghe, MTR
    Corrugated Soil-Steel Bridges have been used as underpass and drainage structures in the Southern Highway Project. This design and construction process is novel to the Sri Lankan context. The Ring Compression theory, which is based on two dimensional plain strain idealizations, has been used in the design of the structures. However due to the presence of the ring walls, the effect of uneven loading in the longitudinal direction due to load combinations of HA and HB loads, these assumptions are in question. The maximum and minimum depths of soil covers have been defined according to the results obtained by the Ring Compression theory. The effects of depth of cover in Soil-Steel bridges were evaluated using finite element computer modelling according to the US 5400 The original design results and the results of finite element analysis were compared. The structural stability of the existing bridges with respect to the different fill heights was determined. The Ring Compression and Finite Element Methods results are compatible for higher depth of covers The stresses of the steel structure for defined maximum and minimum depth of cover, at the ultimate limit state conditions are less than the crushing strength of the steel. Butt further buckling analysis should be considered because the corrugated steel structure vulnerable to buckling failure