Building Technology
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Building Technology
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Item EVALUATION OF CONTRACTORS SAFETY AND HEALTH PERFORMANCE USING OSHA MATHEMATICAL STANDARD(journal of environmental spectrum (JES), 2019-05-29) HASSAN, K.M. MOHAMMED, Y.D. & NMADU, Helen GogoThe rapid growth in the construction industries has led to increases in accidents and fatality rates which threat on the occupational safety and health. Occupational Safety and Health Act (OSHAct) of 1994 obligate employer to provide and maintain a safe and healthful workplace for all employees. Ignorance and lack of safety compliance from contractors had caused employees to violate the safety procedure and the outcomes were unsafe acts, hazardous condition, injuries and accidents. Contractors play an important role in the accomplishment of the building construction. Thus, there is the need to evaluate contractor’s safety and health performance using OSHA mathematical standard. This study is a criteria – based study, and mainly derives quantitative measure in order to evaluate contractor’s safety and health performance using OSHA mathematical standard. Twenty (20) construction companies that meet the study criteria were selected. Some contractor’s performance is very satisfactorily while some are of average. It can be concluded that the number of subcontractors on sites determine the number of employees on site which determine the status of the accidents on site. Also the number of employees on sites determines the numbers of recordable injury or illness per 100 employees. To increase the benefits of safety management system practice on site by the contractors and better overall performance, it is recommended that the contractors should give credence to implementation of health and safety measures through cordial relationship with the construction workers, with emphasis on accident reduction at the construction sites. Keywords: accident, contractors, construction, employees, performanceItem Exploring the Drivers and Barriers for Sustainable Infrastructure Projects Delivery in Sub-Saharan Africa(Environmental Technology & Science Journal (ETSJ), 2019-12) Isa R.B., Bilau A.A., Nmadu, Helen .Gogo, Ogunbode, E.B., Ayegba, C.U.Sustainability of the built environment has become an international imperative within the Architecture, Construction, and Engineering (ACE) sector. While much has been written about the drivers and the mitigating barriers to sustainability and sustainable construction in Africa, the implementation of the concept is still a challenge. This exploratory research employs an interpretative paradigm to add to what is known about the issues in sub-Saharan Africa. The collection, categorization and analysis of interview transcripts and a review of extant literature and document analysis led to salient insights. Findings show that education and experience inform a designer's understanding of sustainable design and construction and designers' understanding of sustainable design value or lack of, affect their behavior attitude and likelihood to promote sustainable practice. The study found that Change strategy that equips a project actor with knowledge and skill needed to do things differently as a major factor for embedding sustainability in the construction industry. Drivers as solutions to barriers that were identified include improved knowledge of sustainable design, leadership and demands, and construction and the material usage. Most importantly, there is a need for a change in client perception of the cost of going greenItem INFLUENCE OF CONTRACTUAL RISKS ON BUILDING PROJECT DELIVERY IN ABUJA, NIGERIA(EDMIC 2019 Environmental design and management international conference, Ile-Ife Nigeria., 2019-05-22) HASSAN, K.M, MOHAMMED, Y.D, & NMADU, Helen GogoContractual risks were risks mostly encountered by contractors in Nigeria and identified to have the consequences on claims, risks in construction especially with the increase construction complexity and the clients are getting more sophisticated in disputes, lack of coordination, delays and inflated costs. Those challenges are due to unanticipated their demands. These challenges prompted this study on influence of contractual risks on building contracts in Abuja. The study largely derives qualitative measure in order to understand the influence of contractual risk on building delivery. The study is criteria – based study, in which certain criteria were outline for the selection of the construction companies. The respondent (stakeholders) samples used in the study were drawn from the total population of stakeholders in the 5 construction companies selected for the study. The total numbers of stakeholders are 220 while 140 were selected for the study following the rules of Krejcie and Morgan, (1970). The analysis of the questionnaires survey data was undertaken using (SPSS) version 20. Correlation analysis was conducted in order to determine the relationship between contractual risks factors and project delivery (time and cost) and the result were found to be significant (P<0.005). This relationship was modeled using simple linear regression and from the model the result shows that contractual risks factors have effect on project delivery in term of time and cost. Risk management should be integrated into project management processes to minimize the effect of contractual risk factors on time and cost increase of building projectItem Developing a Mass Appraisal Approach for Residential Properties in Minna Metropolis(Environmental Technology and Science Journal, 2017-06) Liman, Hassan Shuaibu; Olatunji, Ayodele Isaac; Morenikeji, Gbenga; Olubajo, Oluseun Olukemi; Usman, Zakari DodoMass appraisal has become a standard approach of valuing large groups of properties especially for taxation purpose. It is widely used in developed countries including the US, UK and other European countries as well as in some developing countries such as Malaysia. In this paper, the application of mass appraisal model in Nigeria was examined. Hedonic based multiple regression analysis was used to analyse a set of 91 transaction data recorded between 2009 and 2013. The regression results revealed the contributory effect of the different housing attributes on the house price. Based on these results, a mass appraisal model for residential property valuation was developed. The performance of the model was evaluated using ratio study and the model was found to be adequate. It was discovered that a good mass appraisal model can bring about improvement in property tax administration in the study area by reducing cost and ensuring fairness and equity, which are very crucial in any property tax assessment process. The paper recommends that future studies should incorporate GIS, more explanatory variables as well as larger sample size to improve the accuracy of the model.Item Dynamics in the Adoption of Offsite Construction in the Federal Capital Territory, Abuja(Proceedings of the Nigerian Building Road Research Institute International Conference., 2017-06) Olubajo, Oluseun Olukemi; Olawuyi, Babatunde James; Williams, Frank NdanusaConstruction work involves three major activities namely; material selection, fabrication of components and elements and lastly erection or assembling. The methods of fabrication are either onsite or offsite with the offsite construction established in literature as the most efficient means of erecting high-density housing units within short periods. The slow rate of its adoption and innovation in Nigeria’s construction industry is however a matter of concern. This prompted a study on the dynamics involved in adopting offsite construction processes in the Federal Capital Territory, Abuja with a view to stimulate improved adoption in housing projects. The specific objectives are to identify mechanisms for increasing innovations in construction, to evaluate the level of use of offsite construction processes across housing supply chains and to examine the significance level of forces that interplay in the adoption of offsite construction processes across the housing supply chain. A survey design approach was adopted to achieve this objective while data collected from structured questionnaires using a 5 point Likert scale was analysed with mean item score and ranking. 50 questionnaires were administered and 47 supply chain participants responded from 20 housing projects within the F.C.T. Abuja. The questionnaire comprised of characteristics of supply chain participants, levels in adopting offsite processes in selected building components and elements and relative importance of forces that interplay in adopting offsite construction. Results revealed that the raw material and labour availability with (MIS =4.00) were the most significant influences on housing supply chains. It was concluded that managing raw materials and labour supply more effectively will significantly influence the adoption of offsite construction in housing projects and has direct effects on the performance of the construction industry. The study suggests that stakeholders in construction view themselves as members of a supply chains and collaborate more effectively to ensure better project. outcome.Item Influence of leadership Traits on Team Performance as Correlates of Sucess in Construction Project Delivery(Civil Engineering and Urban Planning: An International Journal (CiVEJ), 2015-06-01) Ekung, Samuel; Olubajo, Oluseun Olukemi; Ebong, UbongThe project environment in Nigeria is shifting from traditional practice towards dispersed teams thereby creating the need to understand leadership attributes that lead to successful project outcomes. This study assessed the impact of leadership traits on team performance as correlates of success in construction projects. Like many other management research, the study involve inferential survey. 172 participants drawn from the different professions in the construction industry selected from 42 mega projects completed in the last three years in south-south Nigeria were sampled. Twelve collaborative leadership traits drawn from emotional, managerial competencies were tested against team performance and team spirit stimulants from the literature. Mean item score was used to evaluate relevance of the traits to collaborative working while hypotheses were tested using chi square. While the result of the study is not different from literature, the far reaching implication is that, project team members’ satisfaction translates into successful projects. Project management’s leadership quest to satisfy the project team must be guided towards collaboration. The current result has advance significantly the understanding of team leadership attributes for the research environment and further buttress the need to meet project participants’ mutual objectives for a successful project.Item Empirical Study on Rainfall Patterns and Construction Programme Provisions in Jos, Nigeria(West African Journal of Building and Road Research. © Nigerian Building and Road Research Institute (NBRRI), Nigerian & Building and Road Research Institute of Council for Scientific and Industrial Research (CSIR-BRRI), Ghana, 2017-11-30) Olubajo, Oluseun Olukemi; Olawuyi, Babatunde JamesWeather conditions affect the duration and cost of construction activities, and many companies have neglected the need to consider the exact empirical effect it has on the delivery of construction projects. This prompted an investigation on the precipitation patterns in Jos Metropolis of Plateau State, Nigeria and its effects on the delivery of construction projects. The study evaluated the amount and frequency of yearly precipitation in Jos, and compared it with the provisions made by Builders and Construction Managers in preparing construction programmes and determined its effect on the construction projects delivery. A Mixed design approach was adopted with Rainfall data collected from the Nigerian Meteorological Agency for over a 10 year period as well as from structured questionnaires. The Data was analysed using mean and percentages. The study concluded that the provisions made for idle or rain days in preparation of work programmes for construction projects were in most cases inaccurate and thus affected the performance of the construction projects. The study suggests measures to be adopted by stakeholders towards better project outcome.