Research Papers - Department of Civil Engineering

Permanent URI for this collectionhttps://rda.sliit.lk/handle/123456789/598

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Has files: YesSubject: search.filters.subject.Developing Countries

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    PublicationOpen Access
    Win Win Approach to Subcontracting in Building Construction: Sri Lankan Perspective
    (Australian Institute of Quantity Surveyors, 2025-12-19) Pasqual, I. R; Ekanayake, L
    Subcontracting has long been studied due to subcontractors’ critical role in construction. However, significant issues persist, especially in developing countries like Sri Lanka, impacting project performance. These issues between main contractors and subcontractors stem from a lack of mitigation methods incorporating relationship management into traditional practices. Furthermore, most prior mitigation strategies are not favorable to both parties. This research aims to develop a “win–win” approach to subcontracting, focusing on relationship and performance management, specifically applicable to building construction. A mixed-method research approach was employed, involving literature review, questionnaire survey, and semi-structured interviews. Quantitative data were analyzed using descriptive statistics, while qualitative data were analyzed thematically. Findings reveal that effectively managing critical factors that influence both subcontracting relationships and subcontractor performance can lead to mutually beneficial outcomes. The study identified critical factors affecting the subcontracting relationship as mutual trust, good communication, and a clear understanding of the work scope by the subcontractor, while for subcontractor performance, the critical factors include time and cost management capabilities of the subcontractor, the availability of finance and working capital for both parties, and issues such as material price increase and inflation rate when subcontractors supply materials. The findings emphasize that prioritizing mutual satisfaction throughout the subcontracting process is essential for implementation. Recommendations provided in this study aim to improve these critical factors, offering practical solutions to enhance project efficiency and individual performance. This research provides valuable insights for developing organizational policies or industry guidelines, particularly for the unique challenges being faced in developing countries.
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    PublicationOpen Access
    Household travel survey method for vehicle kilometers travel estimations: A case study in a developing country.
    (2021-05-01) Gunathilaka, S; Amarasingha, N; Dissanayake, S; Lakmali, M
    Vehicle Kilometers Travelled (VKT) represents number of kilometers travelled by vehicles during a specific period of time in a specific area of concern. Transportation planners, policy makers, urban planners, and estimators of vehicle emission, energy consumption and fuelprice encourage the calculation of VKT for various analytical purposes. However, in most of the developing countries VKT is not estimated due to data challenges. This study aimed at proposing a household travel survey method for estimating VKT in developing countries where timely VKT data are not available. Also, estimating Personal Kilometers Travelled (PKT) seems important in developing countries, since the majority is using public and non-motorized transport modes rather than personal vehicles in those countries. This proposed method allows to collect data that are needed for estimating both VKT and PKT together with socio demographic information. A case study was conducted in three different regions; Northern, Eastern and Southern areas of Sri Lanka, which is a developing country. Questions were asked regarding to trips in a typical week, trips in holidays, special seasons or vacations, number of passengers travelled, travel modes and, socio demography of the respondent. Pilot surveys were conducted prior to the actual surveys to verify the efficiency of developed questionnaire. Samples were taken satisfying all the selected socio demographic categories within the community. Collected data through surveys were aggregated to annual level and, weighted using relevant census and population data. Weighted VKT and PKT estimates were obtained under each selected socio demographic category. Also, VKT estimates were statistically compared for studying the travel behavior of people across different regions. ANOVA and Post Hoc tests were employed for statistical comparisons. These findings can efficiently be used for transport planning, policy making activities, emission calculations, energy consumption estimations etc. by transport and environmental agencies of the country. The case study revealed the experience of utilizing the household travel survey method in Sri Lanka, making it possible to be replicated in other developing countries as well.