Browsing by Author "Peiris, A"

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item: Conference-Full-text
Field application of FRP material in Kentucky
(2013-12-01) Peiris, A; Harik, I
Repair and rehabilitation utilizing FRP composites, especially carbon FRP fabric and laminates are becoming the primary choice for strengthening damaged structural components or for upgrading structures. The deployment of FRP materials in a number of bridges in Kentucky are presented along with a discussion on long term durability. The highlighted field applications include the use of: (1) FRP rebars – both glass FRP (GFRP) and carbon FRP (CFRP) in bridge decks; (2) FRP sections – a pultruded FRP composite I-girder pedestrian bridge and suspension bridge with a GFRP superstructure; (3) CFRP fabric – retrofitting of reinforced concrete box-beams, repair of concrete bridge pedestals, retrofit of precast prestressed I-girders and strengthening of concrete piers; (4) SFRP fabric – steel FRP used to repair crack locations in RC beams and PC I-beams; and (5) CFRP laminate – normal modulus laminates for strengthening reinforced concrete girders as well as ultra high modulus laminates for strengthening steel girders. A discussion of the lessons learned along with recommendations is also presented.
item: Thesis-Abstract
GPS based tracking system for trains in Sri Lanka
Gunasekara, NS; Madurapperuma, AP; Peiris, A
The main objective of this project is to develop a system to electronically monitor the movements of trains in Sri Lanka. This system will be set up inside the control center of the Sri Lanka Railway Department as an auxiliary system, to be used by the technical staff. The system is developed keeping the cost at a minimum at all possible times. Since the main function of the system is to track the location of the trains, it is named as the 'trianTracker'. During natural disasters like Tsunami, locating the exact position of the moving trains is extremely important. Knowing the correct location of the incident makes it easier for the disaster management activities. Probably that could actually be the deciding factor of the fate of thousands of lives. Therefore the trainTracker will function as an important auxiliary system in such situations./ It is evident that our neighboring countries like India and Pakistan are using more and more new technologies for the betterment of the public. This project is also an effort to bring Sri Lanka forward in the South Asian region in terms of using the Information and Communication Technologies in the much overlooked areas like public transportation./ In this train Tracker system, locations of each of the trains will be plotted on a digital map. Control center staff will refer the system whenever they want to locate a particular train. The Global Positioning System is used to derive the location information of the moving trains. The service of a wireless telecommunications service provider is used to send the location information, via short message service from the moving train to the control center./ This train Tracker could also be useful in day to day regular operations as well. The following Chapters in this dissertation present a detailed discussion on analysis, design, and implementation and future improvements of the train Tracker application. A comprehensive user guide of the system is attached to the appendix towards the end of this dissertation.
item: Conference-Full-text
Investigation of movements in block masonry walls
(Department of Civil Engineering, University of Moratuwa, 2014-03) Nandapala, K; Peiris, A; Senavirathna, R; Nanayakkara, D; Hettiarachchi, MTP
One of the main concerns in block masonry is cracking, mainly due to thermal and moisture movement. There are some standards which give guidelines and recommendations to control cracking, but these cannot be directly used for local masonry due to the differences in properties of masonry units used, environmental conditions and the construction techniques. This experimental study is mainly carried out to investigate the extent of movement in block masonry and also to find the influence of mortar mix, initial condition of blocks, type of blocks used and wall thickness on movement in block masonry. Sixteen blockwork panels were constructed to study the selected test parameters on movement in block masonry. The movement was monitored for a period of one year, using dial gauges which were permanently fixed to each panel. From the results, it is found that the movement in block masonry is influenced by the initial moisture condition of the blocks. A significant influence of mortar mix and thickness of wall on movement is not seen from the experimental results. It was observed that the movements reached the maximum values within 8 ~ 9 months after construction of blockwork panels. It is found that the highest shrinkage strain of 0.02% is recorded in the masonry panel constructed with saturated solid blocks and 1: 6 mortar mix.
item: Conference-Full-text
Investigation Of Movements In Block Masonry Walls
(2014-06-09) Nandapala, K; Peiris, A; Senavirathna, R; Nanayakkara, D
One of the main concerns in block masonry is cracking, mainly due to thermal and moisture movement. There are some standards which give guidelines and recommendations to control cracking, but these cannot be directly used for local masonry due to the differences in properties of masonry units used, environmental conditions and the construction techniques. This experimental study is mainly carried out to investigate the extent of movement in block masonry and also to find the influence of mortar mix, initial condition of blocks, type of blocks used and wall thickness on movement in block masonry. Sixteen blockwork panels were constructed to study the selected test parameters on movement in block masonry. The movement was monitored for a period of one year, using dial gauges which were permanently fixed to each panel. From the results, it is found that the movement in block masonry is influenced by the initial moisture condition of the blocks. A significant influence of mortar mix and thickness of wall on movement is not seen from the experimental results. It was observed that the movements reached the maximum values within 8 ~ 9 months after construction of blockwork panels. It is found that the highest shrinkage strain of 0.02% is recorded in the masonry panel constructed with saturated solid blocks and 1: 6 mortar mix.
item: Conference-Abstract
Load testing of bridges for load rating
Peiris, A; Harik, I
The AASHTO load rating method, which is the standard for determining the live load carrying capacity of bridges in the United States, is based primarily on the as-built material and section properties of a bridge. This supplemented with the ASSHTO load distribution factors, generally underestimates the “actual” load rating for bridges. Numerous field studies have shown that field test data provides an accurate representation of the actual bridge, and accurately predict the load rating of bridges. Field testing generally returns higher load ratings than what is predicted by the AASHTO method because it accounts for the actual load distribution, end fixity and stiffness of the structure. With advances in data acquisition and sensor technology, the use of diagnostic testing to evaluate bridge load ratings has become increasingly popular. This paper examines how current technologies are used, principally magnetic and reusable strain gauges and wireless data acquisition, to rapidly load test and improve the load rating of single span steel girder bridges.
item: Conference-Full-text
Manufactured sand as river sand replacement for masonry binding mortar
(IEEE, 2021-07) Sundaralingam, K; Peiris, A; Sathiparan, N; Adhikariwatte, W; Rathnayake, M; Hemachandra, K
Binding mortar establish as an essential part of masonry for binding the masonry units together. Natural sand or river sand is used as a fine aggregate with cement for masonry binding mortar. Although the demand for river sand increases rapidly, on another side, the supply of good quality river sand is reduced due to restrictions in river sand mining. Therefore, there is increasing interest in finding alternative materials for river sand. Manufactured sand is one of the alternatives as it has some advantages over river sand. It provides a better contribution to the strength of the cementitious material, better workability, lesser cement consumption, and eco-friendly. The present study is focused on the progress of a sustainable masonry binding mortar by experimental investigations with manufactured sand as a replacement for river sand. Test for compressive strength was conducted on brick, binding mortar with various combinations of river sand and manufactured sand and masonry prism with different binding mortar. Test results showed that manufactured sand incorporated binding mortar not only shows better compressive strength itself but also significantly improved the compressive strength of masonry.
item: Thesis-Abstract
Study of storm water drainage system across roads case study on Colombo - Horana road
Mansoor, AM; Peiris, A; Wijeyasekera, NTS
The Government of Sri Lanka has planned to develop its southern part in many areas to boost the socio and economic activities. Among the planned development activities, the infrastructure development takes the priority , particularly the improvements to existing roads and new road constructions. The proposed southern highway construction is one such major project that is currently being undertaken. And there are many link roads also to be developed to connect with the proposed highway, the Colombo - Horana road is one of the main link road to be connected to the proposed Southern Highway at Kahatotuwa. At present, many sections of the Colombo - Horana road are in a deplorable conditions and inundate very often when it rains, mainly due to inadequate drainage facilities or inadequate road elevation. The road section, between Kohuwala and Piliyanthala intersections which is approximately 7k111 in length, and there are about twenty five (25) culverts in the section, is also has the very same problem mentioned above. Therefore, this report deals in Identifying the existing drainage problems of the section, Checking the adequacy of all the existing drainage structures within the study area and proposing a suitable design methodology for Road Trace, Safe Road Elevation corresponding flood to the required Return Period and for designing the drainage structure openings. And also to see the possibility of analyzing the drainage problem in using Geographical Information System (GIS).