Browsing by Author "Silva, KSM"

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item: Conference-Full-text
Optimized alternative structural forms for standard highway bridge beams with higher strength concretes
(2013-11-11) Silva, KSM; Jayasinghe, MTR
With the latest developments of concrete technology, it is possible to rely on concretes of higher strengths for normal construction activities with confidence. One of the features of stronger concretes is the ability to withstand higher compressive stresses. This advantage has been fully utilized to propose alternative structural forms for bridge decks using the standard T-beams where the possibility of using lesser number of beams and the lesser quantity of in-situ cast concrete is investigated. It is shown that there is a possibility to form robust bridge decks with half the number of beams when composite beam slab bridge decks are formed instead of pseudo-slab type bridges for the same span range.
item: Thesis-Abstract
The Response of conventional structures in Sri Lanka to adverse forces of nature
Silva, KSM; Jayasinghe, MTR
ABSTRACT With the experience of minor earthquakes in deferent areas in Sri Lanka recent times, structural adequacy of existing structures has been questioned. Since a lot mof research has already been carried out on buildings in related to their behavior in seismic loads, this research focus on Special structure such as "Kalutara Dagaba", Dagaba at Colombo port and Elevated water towers./ Due to unavailability of required data for detailed analysis of first two structures this study has mainly concentrated on elevated water towers. Since the "Intze" type is the most common type of the water tower for more than 500m3 capacities, the scope of this study has further reduced to study of "Intel" type water towers./ Since the effect of wind as well as earth quake would be acting horizontally; there is a general belief among the engineers that those structures design to resist wind forces can withstand minor earth quakes as well./ In this back ground, this study has concentrated on the impact of wind and earthquakes on "Intze" type water towers of deferent capacities. Analysis shows that exiting water towers which have designed for wind loads are not adequately strong for the resisting earthquakes. It is hoped that this study will shed light some structural deficiencies available in existing structures with respect to lateral loads of dynamic nature.