Constructability Rankings of Construction Systems Based on the Analytical Hierarchy Process

Lam, Pti; Chan, Albert P.C.; Wong, Francis; Wong, Fkw

doi:10.1061/(asce)1076-0431(2007)13:1(36)

Cited by 49 publications

(36 citation statements)

References 24 publications

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“…Results show that buildability issues have the highest level of impact on onsite productivity. This finding support the conclusions of several studies (Jarkas, 2010;Lam and Wong 2009;Saghatforoush et al 2009;Lam et al 2007) that buildability issues, especially where design details are lacking, could slow down onsite work progress. …”

Section: Project Characteristicssupporting

confidence: 87%

On-site Labour Productivity of New Zealand Construction Industry: Key Constraints and Improvement Measures

Durdyev

Mbachu

2011

CEB

148

109

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Productivity is key to the survival and growth of any organisation, industry or nation. Some factors constrain the achievement of the set project objectives in the New Zealand building and construction industry and are responsible for the reported steady decline of productivity and performance. This study aims to identify the key constraints to on-site labour productivity and improvement measures. Using the descriptive survey method, views of some project managers, contractors and subcontractors in New Zealand were canvassed via pilot interviews and questionnaire surveys at the qualitative and quantitative data gathering stages, respectively. Multi-attribute technique was used to analyse the quantitative data. Results showed that the key external constraints to on-site labour productivity comprise, in order of decreasing impact, statutory compliance, unforeseen events and wider external dynamics. The internal constraints were found to have much higher impact on onsite productivity than the external factors. In order of diminishing levels of impact, the internal constraints comprise reworks, level of skill and experience of the workforce, adequacy of method of construction, buildability issues, and inadequate supervision and coordination. . The factors underlying each broad category of external and internal constraints are reported. The relative levels of impact of the identified constraints are expected to guide the project team in addressing the constraints in a cost-effective manner.

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Section: Project Characteristicssupporting

confidence: 87%

On-site Labour Productivity of New Zealand Construction Industry: Key Constraints and Improvement Measures

Durdyev

Mbachu

2011

CEB

148

109

View full text Add to dashboard Cite

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“…Moreover, the project duration shortens as the production and erection processes are not affected by the vagaries of weather and great fluctuations in labourers' productivity; and the project cost goes down since the project duration gets shorter, fewer on-site labourers are employed, and fewer materials are wasted during the production and erection processes (e.g., Chan and Hu 2002;Eastman et al 2003;Sacks et al 2004;Hamill et al 2006;Manrique et al 2007;Tam et al 2007). The use of precast concrete systems may also help in improving health and safety issues throughout the construction process because fewer activities are carried out on site, which ultimately reduces the number of accidents that may happen (Lam et al 2007). In addition, precast concrete contributes to sustainable practices by incorporating integrated design, using materials efficiently, and reducing construction waste, site disturbance, and noise (VanGeem 2006).…”

Section: Introductionmentioning

confidence: 99%

Precast Concrete Systems in Developing vs. Industrialized Countries

Polat

2010

Journal of Civil Engineering and Management

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Abstract. Precast concrete technology is recognized worldwide as offering significant advantages. Despite the advantages they offer, precast concrete building systems' share in both Turkey and the U.S. is very low, especially when compared to many European countries. Since Turkey is a developing country that is technologically dependent on the developed world, low share of industrialized building systems is highly expected in that country. However, the U.S. is a developed and industrialized country, so it was very interesting to see that these systems are not extensively used in that country either. This study investigated the factors that prevent the extensive use of precast concrete systems in the U.S. and Turkey through an extensive questionnaire survey. The survey results revealed that the perceptions of the American vs. Turkish respondents on most of the factors that affect the use of precast concrete systems are significantly different from each other. While American respondents considered size and load restrictions on transportation, poor communication among parties, and lack of qualified contractors specialized in precast concrete systems as three most important barriers to the extensive use of precast concrete systems in the U.S. building construction market, Turkish respondents ranked lack of good communication among parties and lack of structural engineers and contractors specialized in precast concrete systems as the most important three factors that prevent the extensive use of these systems in Turkey. This study indicated that precast concrete users and manufacturers should recognize that the main reasons for low utilization of precast concrete systems predominantly depend on the prevailing conditions of the country in question.

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“…Such a finding was further corroborated by Lam et al (2007), where the precast method was rated as the most buildable construction method. Moreover, studies in the United States, United Kingdom, and Australia have demonstrated that improved buildability has lead to significant savings in both time and cost required for completing construction projects (Trigunarsyah 2004).…”

Section: Literature Reviewmentioning

confidence: 66%

The Impacts of Buildability Factors on Formwork Labour Productivity of Columns

Jarkas

2010

Journal of Civil Engineering and Management

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Abstract. The impacts of buildability on formwork labour productivity of major in situ reinforced concrete elements such as, foundations, walls, columns, beams and slabs, are yet to be determined and quantified. The labour unit cost of columns formwork, in comparison with other constituents of the reinforced concrete frame, is constantly higher due to the forming complexity of these elements, especially non-rectangular shapes, and the small output achieved in the operation. Therefore, the objective of this research is to investigate the impacts of buildability factors on columns formwork labour productivity. To achieve this objective, a large volume of productivity data was collected and analyzed using the categorical-regression method. As a result, the impacts of the grid patterns, variability of column sizes, repetition, total and average shutter size, and geometry of columns are quantified. Apart from the variability of column sizes, the findings show significant effects of these factors on labour productivity, which can be used to provide designers feedback on how well their designs consider the requirements of buildability principles, and the consequences of their decisions on labour efficiency. Moreover, the depicted patterns of results may provide guidance to construction managers for effective activity planning and efficient labour utilization.

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Constructability Rankings of Construction Systems Based on the Analytical Hierarchy Process

Cited by 49 publications

References 24 publications

On-site Labour Productivity of New Zealand Construction Industry: Key Constraints and Improvement Measures

On-site Labour Productivity of New Zealand Construction Industry: Key Constraints and Improvement Measures

Precast Concrete Systems in Developing vs. Industrialized Countries

The Impacts of Buildability Factors on Formwork Labour Productivity of Columns

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