Browsing by Author "Jayasinghe, S"

Now showing 1 - 16 of 16

item: Article-Full-text
The black prince’s chapel: An architectural record of the church of our lady of the gate of heaven
(2015-10-15) Jayasinghe, S
Heritage buildings not only provide a living record of our social and cultural history but also make a positive contribution to our sense of place and our transnational identity. The four hundred year old church of Our Lady of the Gate of Heaven, Telheiras in the suburbs of Lisbon is an example of such a building. It is historically unique in relation to the religio-cultural and political affairs of Sri Lanka and Portugal during the overseas expansions of 16th and 17th centuries as it is presumed that this church and the convent is the only building erected in Europe by a Sri Lankan. It was originally built by Don Joao, known as the Black Prince, O Principe Negro in Portuguese sources, was a prince from Kandyan kingdom of Sri Lanka. He was the last male heir of the old Kandyan dynasty. Don Joao, the Black Prince’s ancestry can be historically traced back to the period of the fall of Kotte kingdom and the emergence of the Kandyan kingdom. He was the son ofYamasinhaBandara who was placed on the throne of Kandyan kingdom in 1592. After Yamasinha’s sudden death his 12 year-old son Don Joao, was proclaimed as the king. But due to political instability in the region, he was forced to leave the kingdom and seek protection in Colombo from the Portuguese. They entrusted him to the care of the Portuguese Franciscans missionaries. Subsequently Don Joao was sent to Goa, which was his home for fifteen years, later he was ordained as sub deacon priest was called to Lisbon and finally he settled down at Telheiras where around 1625 he built this church and convent in appreciation of what the Franciscans had done for him. The aim of this paper is to understand and document the historical evidence available in this church building and record the graphically-based historical information for research, publication and also for archival purpose
item: E-Book
The black prince’s chapel: The church built by a Sinhalese prince in Portugal
(2015-10-13) Jayasinghe, S;
item: SRC-Report
The Chronological development of baptismal fonts in urban churches in Colombo, Sri Lanka
(2020) Jayasinghe, S
Baptism is the act of ceremonial cleansing by which a person becomes a member of a Christian church. Although baptism could occur anywhere, the special place for baptism, either a freestanding building or smaller font, is a significant element of every communal church. Therefore, the baptistery or baptismal font has become an ordinary piece of furniture in many Christian churches practicing non-immersive methods, such as sprinkling or pouring of water. The simplest of these fonts have a stone, metal, or wooden pedestal, with a holder that could accommodate different shapes of water basins. Despite their smaller size, baptismal fonts often intermingle with prevailing architectural characters of an urban landscape. For instance, the signs and symbols prevalent in the baptismal fonts of most Anglican churches in Colombo mostly follow Gothic Revival architectural precedents. The relevant modern historiographical sources on the 19th and 20th-century urban architecture in Sri Lanka reveal that no systematic study on this significant aspect of church architecture has been conducted so far. Therefore, the main objective of this technical report was to record and analyze the chronological development of architectural characters as well as the current condition and state of preservation of 19th and 20th century Baptismal Fonts in urban churches in Colombo and its suburbs. Under this documentation project, the decorations and motives from the most representative Christian churches from different religious denominations have been systematically recorded as per their chronological development. Architectural measured drawings and graphical data were documented in parallel to understand the integration of the prevailing architectural character of buildings. Further, this documentation can be extended as a record for posterity and a primary tool for conservation and restoration. It can be used to communicate the architectural significance and heritage of surviving baptismal fonts not only to design and conservation professionals but to the public at large.
item: Thesis-Abstract
Comparison of portal frames of UB sections with the lattice girder portal frames
Jayasinghe, S; Hettiaracchchi, MTP
Portal frame structures are very popular in industrial buildings due to their pleasing appearance and shorter construction period. In Sri Lanka too, steel construction is increasingly being used for single storey buildings. Basically there are two types of steel portal frames adopted in Sri Lanka; these are called Prefabricated and pre- engineered portal frames./ Although the portal frame is inherently pleasing to the eye, given a well proportioned and detailed design, and less in cost for providing controlled environments, industrial connotation, together with increased service requirements has encouraged the use of lattice trusses for the roof structures. /The structural forms both in the simple form fixed column bases and as portal frames with moment resisting connections between the tops of columns are used for long span structures./ Although it is widely used, portal frame may not be the best solution for large span single story buildings. Lattice girders are successfully used for medium size spans. However it is not widely used for large span buildings in Sri Lanka./ The construction industry here has many years of experience and necessary skills on fabricating truss or lattice type structures. Even though skilled and unskilled labor involvement is high, it will not reflect crucially on ultimate cost of the structure as the labor cost is less here in Sri Lanka, compared to European countries. Therefore in Sri Lanka lattice girder construction for large span buildings may be more cost effective. The main objective of this research is to compare the portal frames formed with lattice girders with the conventional portal frames with Universal Beam sections for different span ranges and compare them in same spans, in the context of optimum cost and space requirements.
item: E-Book
Dwelling of faith: Art & architecture of the catholic churches in the Galle diocese
(2015-10-12) Jayasinghe, S
item: Conference-Full-text
Evaluation of evapotranspiration methods to replace penman- monteith method in the absence of required climatic data in order to have a better Irrigation scheduling
(2013-11-12) Jayasinghe, S
Evapotranspiration (ET) can be identified as a key function of vegetation which develops interaction in between climatologic, hydrological and terrestrial environments. Though there are number of climatologic methods are available to calculate ET such as Penman- MonteithMethod(PMM), Blany-Criddle Method(BCM), Radiation Method (RM), Hargreaves- Samani Method(HSM), Linacre Method(LM), Makkink Method(MM) and Turc Method(TM),in practice Penman- Monteith Method is used since it is likely to provide the most satisfactory result. But, it is not easier to obtain all types of climatic data since malfunctioning ofweather stations.However, the method selected to estimate ET should produce reasonable result with minimum number of climatic data. Thus, this attempt was taken in order to identify the most suitable method to utilize in various months to calculate ET considering the quality of result and input data requirement.According to the obtained results both Hargreves- Samani and Linacre Methods have shown reasonable values to replace PMM. Therefore Irrigation demand can be predicted and will be able to plan fairly successful irrigation scheduling in the field.
item: Conference-Full-text
Hierarchical identity and space; a study on long surviving railway station interior in sri lanka.
(2019) Samarasinghe, AM; Jayasinghe, S; Samarawickrama, S
The visual interpretations of railway interior in Sri Lanka continue to maintain its timeworn fashion only with minor changes while infrastructure and furniture design in the rest of the world, experience rapid transformation. This study has investigated interior of twenty railway stations located on the Main Line (Colombo - Badulla) and also has been interviewed with the staff who use this furniture. Moreover, these studies argue the design particulars of the furniture extremely connected to the hierarchy of the staff, within the station.
item: Conference-Abstract
“Identity Crisis" of Post-Colonial Church Architecture in Sri Lanka
(2015-12-14) Jayasinghe, S
With the Colonization of Asia, the Christian Church introduced a new form of religious architecture which was much in contrast to the prevailing religious architecture of the era. But during the period of post-independence, ‘the postcolonial church architecture’ is seen as becoming resistant to the colonial identity. Within Asia, Sri Lanka is a country which has been colonized by three European powers, hence a good example for the study of the de-colonization process of religious architecture. The objective of this paper is to examine the typologies that were re-invented as alternative means of ‘indigenous Christian identity’ and also to analyze such architectural examples which illustrate the ‘native form of church’ during the decolonizing process of religious architecture in Sri Lanka.
item: Conference-Full-text
Intelligent water management system with remote access and monitoring
(2015-07-02) Kanchana, C; Jayaweera, T; Jayasinghe, S; Jayawardana, D; Wickramarachchi, N
This paper examines and proposes an intelligent solution for 11controlling of water level in a dynamic water distribution system. Principle objective of the controller is to provide required water quantity with a required minimum head while keeping the motor in its most efficient region. In order to achieve these objectives, a prototype of water level control system has been built and an intelligent fuzzy logic control algorithm is developed. Water level of the tank is fixed by an intelligent algorithm. This algorithm will predict the optimal water level which needs to be maintained. Fuzzy algorithm is developed and tuned using Simulink embed into micro-controller and their performances are compared.
item: Conference-Abstract
Investigation of the physical and rheological properties of carbon black modified bitumen
(Transportation Engineering Group, Department of Civil Engineering, University of Moratuwa, 2023-12-08) Jayasinghe, S; Hettiarachchi, C; Mampearachchi, WK; Jayantha, WRAN
Traveling and transport is an essential part of the day to day life. All kinds of users from pedestrians to a vast range of vehicles, expect a comfortable and controllable movement through the road. To provide a smooth, durable and quality surface for these users, pavement performance is very important. But reasons such as different environmental conditions, tire pressure and high traffic volume may lead pavement to rutting, low temperature cracking and fatigue. As a solution to enhance the performance of pavements and avoid these distresses, modifying the bitumen properties has been considered from the earlier days of asphalt pavement technology. Vast range of studies have tried out on bitumen to eliminate the material properties and increase the overall performance. Further, polymer has become the commonly used medium for bitumen modification as a pavement performance enhancing method. Styrene butadiene styrene (SBS) and styrene butadiene rubber (SBR) are some frequently used modifier types. In Literature, it is clearly observable that both physical and rheological properties of the base bitumen have significantly improved by polymer modifiers. Although polymer modified bitumen types are effective in performance, they are economically less effective. The major imperfection of polymer modifiers is degradation of polymer due to aging and incompatibility. Therefore, the researchers pay their attention towards more effective modifiers. Vermiculite, waste oil modifiers, crumb rubber modified, rock asphalts, asphalt rubber and nano-particles/polymer are some of additives which were tried on bitumen as modifiers. Moreover, the capability to improve the pavement performance using mineral fillers; dust from crushing and screening of aggregates, lime, Portland cement, fly ash and carbon black (CB) has attracted the attention of the world nowadays. Among the above mineral fillers, Carbon black is a waste material which is extracted from waste tires or petrochemical waste. Carbon Black is a black power which has particles of irregular shapes and large specific surface area. Carbon elements are the main components while oxygen, hydrogen, sulfur and other impurities may be contained in Carbon Black. Modified bitumen with carbon black has a good influence on high temperature permanent deformation and aging properties. Several studies have mixed additional materials altogether with Carbon Black to address some issues in modified bitumen. Further, Carbon black is much cheaper and environmentally friendly than polymer modifiers. Therefore, diving more into these carbon black Bitumen modifications is important. This paper presents a series of experiments which performs to evaluate the properties of Carbon Black modified bitumen. Scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy are used to observe the topography and the chemical composition of the Carbon black. Mixing time, mixing temperature and Carbon Black content varies while modifying by melt blending with a high shear mixer to obtain the optimum parameters. Penetration, Ductility, Softening Point, Viscosity, Dynamic shear rheometer (DSR) test, bending beam rheometer (BBR) test identify the physical and rheological parameters of modified bitumen. All the Tests perform according to the ASTM standards. It can observe significant impact on physical and rheological properties of the bitumen after analyzing these results. Father, low temperature cracking resistance of bitumen decreases with the addition of Carbon Black and high- temperature deformation resistance has developed. This paper provides a thorough study of properties of carbon black modified bitumen and emphasizes the further research requirement regarding this area.
item: Conference-Full-text
Issues with supply chain management documents that contribute to project delays
(Department of Building Economics, 2024) Ekanayake, J; Allis, C; Jayasinghe, S; Lokuge, A; Sandanayake, YG; Waidyasekara, KGAS; Ranadewa, KATO; Chandanie, H
Supply chain management is the process of obtaining the raw materials or components needed to create a product or service for an enterprise and deliver that product or service to customers. In construction, it is vital due to the involvement of a large number of resources and stakeholders. Hence, documentation plays a very important role in such a process. Yet, there are certain issues with supply chain management documents that contribute to the various issues of construction projects, including project delays. Hence, this research aimed to identify the potential factors affecting construction projects due to poor documents in supply chain management. This study was limited to building construction projects in Sri Lanka. Agreement errors of labour suppliers and material suppliers were the main areas of concern. In order to achieve the objectives of the research, semi-structured interviews were conducted among construction professionals such as site engineers, project managers, technical officers, and Quantity Surveyors. The results of the research revealed that the documents were not prepared correctly, which indirectly caused the project to be delayed. This could happen due to various causes, such as documentation errors that take a long time to be corrected, people are not aware of the documentation required in various stages of the supply chain, and the stakeholders are not aware of the procedures correctly for each of the scenarios. Findings further revealed that errors such as delays, arithmetic mistakes, and specification inaccuracies frequently disrupt operations. To address these issues, corrective actions tailored to each document type were detailed, emphasising early negotiation, skilled personnel involvement, and rigorous verification processes. The study contributes significantly to the field by offering practical solutions that enhance document accuracy, improve supply chain efficiency, and reduce project delays. These measures not only address immediate documentation issues but also provide a framework for maintaining high standards of documentation accuracy in the construction industry, ensuring smoother operations and successful project completions.
item: Conference-Abstract
Nineteenth century Catholic Church architecture in Sri Lanka: Evolution of a tropical model
(2016-09-13) Jayasinghe, S
Sri Lanka has been ruled by three consecutive Euro-Christian nations for nearly 450 years from 1505 to 1948. During their conquests they attempted to introduce their own denomination of Christianity to the country, i.e., Portuguese – Catholic, Dutch – Reformed and British – Anglican. Thus the architectural typologies of the churches built by the colonials differed. The most notable typology of the Portuguese churches was the typically longitudinal plan with three naves and a plain front façade. The principal typology of the Dutch churches was the Greek cross plan with high gable façades. The preferred architectural style of the British churches may best be described as the Victorian Gothic. With the advent of the British in the beginning of the19th century the persecution of Roman Catholicism imposed by the Dutch came to an end. This triggered off a revival that gave rise to a new architectural programme reflecting more indigenous and tropical characteristics in church architecture. The ultimate form generated in this programme, was articulated mostly by the integration of two side verandahs. It is particularly noteworthy that the retrofitting of these new elements resulted in the evolution of the preceding Portuguese typology. This paper intends exploring the origin and the development of this particular model of church architecture, created as an alternative to the tropical church. The spatial progression and building techniques in selected three architectural examples of 19th Century Catholic churches are systematically observed and analyzed in the light of their adaptations to the oriental religious practices and environmental conditions.
item: Conference-Full-text
Processing of gem minerals
(Department of Mining and Mineral Engineering, 1984-05-28) Jayasinghe, S
The processing of Gem Minerals includes identification, selection for variety and grading for quality, size and use etc. It also includes identification of rare stones, identification and selection of stones which need to be treated (heat or otherwise) prior to cuttiug, polishing and other forms of treatment. The author also stresses the following The various stages of cutting and polishing, carving of ornamental items, making abrasives, grading and grouping of cut and polished stones for marketing to the traders, related industries or to the ultimate user
item: E-Book
Santhanadeepaya: Heritage catholic churches of the Kalpitiya peninsula
(2015-10-13) Jayasinghe, S; Jayasinghe, S
item: Conference-Full-text
Study on the relation between solid waste volume and residential collection methods with reference to Soysapura flats
(2017) Jayakody, DMSS; Jayasinghe, S
Everyday human generates waste and municipal solid waste is supposed to be increased with urbanization. 3 billion urban residents generate 1.2 Kg of waste per person per day. This study was carried in Soysapura Flats which is located 17 Km away from the financial capital of Sri Lanka. The main objective was to study the impact of the volume of urban domestic solid waste on collection and storing methods in Soysapura Flats. The literature reveals that the volume of waste generated in developing countries continues to increase and the contribution by the urban domestic waste is effective but there is a lacuna of studies related to the residential waste collection and storing in the aspect of volume. The study used a combination of both quantitative and qualitative methodologies. 80 families were selected and interviewed to identify their methods of waste disposal, devices, practices and attitudes. And necessary measuring tools were used in order to carry out the volume measurements. The findings revealed that 8.062 litres of degradable waste and 5.828 litres of non-degradable waste generated per day by a family of Soysapura Flats. The degradable volume of waste was easily managed with the present collection method and system but not the non-degradable waste category. Further detailed investigation is needed to identify the impact of waste volume on collection methods, especially in the aspect of waste and waste types.
item: Conference-Abstract
Urbanization and responsiveness to health : exploring multi- disciplinary attributes for a holistic approach
Jayasinghe, S; Rajapakse, RMKU
Urbanization is a leading global trend. With the intensifying drift in urbanization in developing nations, 70% of global population will concentrate in the cities of Asia and Africa by the year 2030. Sri Lanka is also seeing a process of rapid planned and unplanned urbanization estimates are that close to 3 million (or 17%) of the population live in urban areas. This figure is likely to increase further with the planned ambitious Megapolis project of the government covering the whole of the Western Province.