Browsing by Author "Jayasinghe, T"

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item: Conference-Full-text
A comparative study to evaluate the effectiveness of different structural forms for medium-rise apartment buildings
(IEEE, 2022-07) Wijekoon, S; Jayasinghe, T; Herath, S; Herath, A; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
The rapid urban migration and the infrequency of spaces in megacities have become a challenge for all most all countries. To fulfill the housing requirements of the ever-growing population with the scarcity of valuable lands, the best solution is to come up with high-rise or medium-rise apartment buildings. Even though there are different structural forms that can be incorporated into high-rise apartment structures, most of the time structural designers select based on their experience and approach which are not effective all the time. The structural design for a given structure should be optimum in terms of structural performance and associated costs. Since wind and seismic forces govern the design of high-rise structures, those lateral forces are significant to be studied. So, this analytical study was carried out to evaluate the effectiveness of six different structural systems of 20-story RC (Reinforced Concrete) structures under the effect of wind and seismic loadings including a moment-resisting frame as the base model, four wall frame structures and a frame-tube structure. Models are compared based on the parameters such as maximum top storey displacement, inter-storey drift ratios, member forces and moments utilization, seismic induced base shear and human perception levels of lateral acceleration.
item: Thesis-Abstract
Design of a technique to study the stress relaxation behaviour of crosslinked rubbers subjected to a constant tensile strain
Jayasinghe, T; Fernando, KP
The objective of this work was to design a technique to study the stress relaxation behaviour of crosnlinked rubbers subjected to a constant tensilestra in, with provision for monitoring two independent parameters namelya. The force on the specimen (under constant strain) at a given timeb. The instantaneous modulus of the specimen at a given time, which is given by the gradient of the force versus deflection curve when the strained specimenis subjected to a further deformation at the time of measurement. The importance of these two parameters lies in the fact that the decay of the force on the specimen under constant strain is a good estimate of the cleave of the chemical bonds on the rubber network with time while the instantaneous modulus is an indication of the influence of the secondary network formed by the cleaved bonds on the rubber. The theories of stress relaxation and the equipment available for stress relaxation Measurements are discussed in detail it: this work in addition to the details of the proposed technique. It should be mentioned that especial emphasis was made here to reduce the cost of equipment when compared with the standard equipments available so that this technique could be made more popular among quality control as well as research workers. In this respect, the proposed equipment was designed in such a way that the load measuring device, which is the most expensive component in the set up could be shared among number of specimens under obesrvations , without disturbing their deformations. Number of specimens prepared under similar conditions were tested using the proposed equipment to study its reproducibility. It was found that the decay of the force on the strained specimen with time was showing excellent reproducibility even though the instantaneous modulus did not show such behavior. A detailed analysis of these results with further modifications recommended is given at the latter part of this work.
item: Conference-Full-text
Development of a microscopic traffic simulation model for Galle road, Colombo
(Sri Lanka Society of Transport and Logistics, 2022-08) Jayasinghe, T; Sivakumar, T; Kumarage, AS; Perera, N; Thibbotuwawa, A
This research attempts to build a microscopic traffic simulation model for a 17km road section in the Galle Road corridor in Colombo, Sri Lanka. The simulation was developed by utilizing existing traffic counts collected at multiple intersections. The developed model is validated with actual hourly traffic speeds on the corridor. This simulation platform can be used to evaluate different traffic management interventions.
item: Conference-Full-text
Study on the cracks developed in Dematamal Viharaya, Uva Province Sri Lanka
(2013-11-26) Paskaran, S; Perera, M; Kumara, D; Jayasinghe, T; Jayasinghe, C; Lewangamage, S;
Stupas of Sri Lanka stand as proud examples for the engineering Excellence of ancient Sri Lanka. Dematamal Viharaya at Butthala is one of the oldest Stupas in Sri Lanka built in the 2nd Century BC. It is a, 19m tall non-plastered brick structure. This Stupa has developed since 1998. Cracks have initiated from the Pesawalalu and propagate to the top of the Dome. The width of these cracks varies from 0.2mm to 0.5mm. The research covered in this report is aimed at the identification of the causes for the cracks and to propose corrective actions. A comprehensive study was carried out to identify the possible causes for the cracks which may be due to self weight and shape of the stupa, expansive nature of soil, arch action induced due to separation of old and modern masonry. Experiments were done to assess the expansive nature of the soil and A Finite element analysis was carried out using the Finite element software SAP2000. The results revealed that the possible cause can be the arch action induced due to separation of old and modern masonry. Increasing the bearing of the new brick work at the base and the installation of a tie beam around the pesawalalu are the two corrective actions suggested in this report.
item: Article-Full-text
Suitability of modular technology for house construction in sri lanka
(MDPI, 2023) Munmulla, T; Gamage, HDH; Navaratnam, S; Ponnampalam, T; Zhang, G; Jayasinghe, T
Prefabricated volumetric modular building construction is an emerging technology in many countries used to develop the construction industry through its value-added benefits. The adoption of these novel technologies in the Sri Lankan construction industry has been relatively slow compared with other developing countries, delaying the development of the construction industry and the attainment of the added benefits of these technologies. Therefore, this study aims to identify the suitability of modular construction for the Sri Lankan construction industry via a survey and case study. A questionnaire survey was developed and distributed to assess and identify the benefits of implementing the concepts and constraints in Sri Lanka. Then, the construction cost of a proposed single-story house delivered through conventional and modular practices was compared. The survey results showed that introducing a modular concept to the industry is suitable and would benefit the Sri Lankan construction industry. Further, survey participants believed that the economic benefits brought in by modular construction are significantly more important than environmental and social benefits when selecting modular construction. The case study on a single-story affordable modular house showed a 32% reduction in total construction costs and a 36% reduction in labour costs compared to conventional house construction. Further, costs for total modular construction and labour were 32% and 36% less than those of conventional construction costs and labour costs. Moreover, a 16% reduction in embodied energy was observed when compared with conventional construction. Therefore, the modular concept could be used to construct affordable houses and will be cost-effective with the correct choice of material.