The Impacts of Buildability Factors on Formwork Labour Productivity of Columns

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 aver‐age 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. Santrauka Statybos veiksniu itaka gelžbetoniniu konstrukciju, kaip antai pamatu, sienu, kolonu, siju ir perdangos plokščiu, klojiniu, irengimo darbo našumui turi būti nustatyta ir kiekybiškai ivertinta. Vienetines darbo sanaudos kolonos klojiniams irengti, palyginti su kitomis gelžbetoninio remo dalimis, yra didesnes, nes sudetinga suformuoti elementus, ypač kai kolonos yra ne stačiakampio formos. Todel šio tyrimo tikslas – nustatyti statybos veiksniu itaka kolonu klojiniu irengimui. Siekiant šio tikslo buvo surinkta daug duomenu apie darbo našuma ir šie duomenys buvo ištirti naudojant kategoriju‐regresijos metoda. Buvo ivertinti šie veiksniai: ašiu tinklas, kolonu dydžio ivairove, kartojimasis, bendrasis ir vidutinis užrakto dydis, geometrija. Neivertinus kolonu dydžio ivairoves, gauti rezultatai rodo didžiuli šiu veiksniu poveiki darbo našumui. Naudojantis šia informacija galima ivertinti, ar projektuotojas atsižvelge i statybos principus ir priimtu sprendimu itaka darbo našumui. Be to, rezultatai gal suteikti papildomos informacijos darbu vadovui, kaip efektyviau panaudoti darbo jega.