Research Publications

Now showing 1 - 3 of 3

Open Access
DELAYS AND DISRUPTIONS IN THE CONSTRUCTION INDUSTRY DURING THE GLOBAL PANDEMIC
(researchgate.net, 2022-06-24) Gammanage, S. H; Gunarathna, N
COVID-19 pandemic has become a global catastrophe today dragging many nations towards severe economic distress. The Sri Lankan economy has no exception. Not surprisingly, the sluggish economic conditions in the country have adversely affected the construction industry in Sri Lanka. The pandemic has resulted in almost every construction project getting delayed or disrupted. This research aims to determine the factors that caused delays and disruptions in large scale construction projects in Sri Lanka due to pandemic. The overall impact of the global pandemic on construction projects in both local and international platforms were identified through a comprehensive literature review. Additionally, the impact on the local domain in terms of delay and disruption was assessed based on exploratory interviews and survey questionnaire disseminated among industry experts. Final conclusions were drawn by conducting 9 case studies and analysing responses to survey questionnaire provided by 30 industry practitioners. This study assisted in finding measures and mechanisms currently in use to mitigate the impact of delay and disruption of the construction phase of construction projects. The findings also paved the way to recognize innovative mitigation strategies to control the adverse impact on on-going construction projects. Analysis of the responses concluded that, delay in project kick-off, delays in material delivery, shortage of material, project suspension, reduction in the workforce productivity, health and safety concerns, regular price escalations as the key elements attributed to impact the project progress. The study has identified the present mitigating controls over delays or disruption are barely sufficient to address the concern and thus emphasised the need to resort to more effective techniques to remedy the issue.
Open Access
Estimating the Delay to the Mainstream Traffic due to Jaywalking Pedestrians on Urban Roads
(ASCE, 2021-06) Jayatilleke, S; Wickramasinghe, V; Madushani, H; Dissanayake, S
Growth of road users in urban areas results in consequential higher interactions between pedestrians and vehicles causing delay to the mainstream traffic flow. The delay caused by pedestrians who make random jaywalking along the carriageway is substantial when such behavior exists. Thus, the prime objective of this research was to study the interaction and develop a delay model to estimate the collective delay caused to the mainstream traffic which encounters jaywalking pedestrians. This delay is influenced by the characteristics of the crossing pedestrians and the behavior of on-coming vehicles. The data collection was done in a suburban city near Colombo, Sri Lanka. The data were extracted from video footages taken using a drone camera. Both the movement of the vehicles and crossing pedestrians on the subject lane were tracked using automated software in order to enhance the accuracy of the results. The delay caused to mainstream vehicle was derived using the deceleration and acceleration behavior. The proposed delay model exemplifies that the pedestrian-vehicle gap and the pedestrian speed along with other relevant pedestrian characteristics such as age, pedestrian speed at the start of the vehicle speed drop, and vehicle-related characteristics such as vehicle speed at the start and end, veh-ped gap at the vehicle speed drop, subject lane, and vehicle type are highly significant to the delay of the subject vehicle on the mainstream. The overall R value of 0.63 was observed from the regression analysis of the proposed delay model. The applicability of the proposed model for each pedestrian and vehicle characteristic has been determined and evaluated based on their level of significance.
Embargo
Trainko: poster abstract: train arrival time prediction system for Sri Lanka
(acm.org, 2011-04-11) Jayawardena, A. N; Sachith, K; Wijekoon, J
Transportation system is a massive enterprise with substantial direct and indirect effects on economic growth of a country, and train system is playing a major role of the transportation system. However, the train system in Sri Lanka is usually late and the passengers come to the stations without knowing the train arrival time, whereas the passengers waste their valuable time at the train station waiting for the trains. To this end, this paper proposes to the smarten Sri Lankan the train system by predicting the time a train reaches to its upcoming stations and sending the notifications to the subscribers about the arrival time to their stations. Subscribers then can reach their station whenever the train is reaching to the station or they can use any other means of transportation if the train is late.

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