부산대학교 도서관

It is important assignments to calculate moderately not only direct construction costs, in accordance with the costs but also indirect construction costs in prediction of construction costs in the first business stage. The study extracted direct labor productivity and indirect cost rate in accordance with this productivity through collecting and analyzing field measurements and result data, targeting steel frame assembling work of steel frame constructions. So, this study tried to lighten up main factors that affect the indirect cost rate through expert interviews and surveys. Also, to review propriety of extracted numbers, I compared and analyzed factory indirect cost rates shown in a standard of construction estimate (2012). As a result, it was revealed that direct labor productivity of steel fabrication and welding were 1.00(person·day/ton), 0.35(person·day/ton), respe-ctively. It was also found that the ratio of indirect labor productivity compared to the direct labor ratio was approximately 17% and the ratio of indirect cost compared to direct cost was approximately 93%. After analyzing effect factors influencing indirect cost rates, ‘differences of factory areas’ and ‘differences of outsourcing processing and direct management processing’ among steel frame factories several features could be known to affect indirect cost rates meaningfully statistically. Finally, to compare and review with factory indirect cost rates’ levels of the standard of construction estimate (2012), recalculated indirect expense rate was about 54% level compared with direct labor cost rate excluding insurance fees, other expenses, and general management costs. It was similar to 60% of overhead expense rate proposed in steel and steel frame constructions of the standard of construction estimate revised in 2007.This study’s result is on contents of inspection and analysis for real conditions of labor productivity and indirect expenses of the steel frame processing factories. Therefore, it is expected to help in calculation of correct and realistic construction costs.