| Title |
A Compensation Method and Comparative Analysis of Historical Unit Price Considering Work Types for Large and Small-Scale Projects |
| Authors |
홍성호(Hong, Sung Ho) ; 이동욱(Lee, Dong Wook) |
| DOI |
https://doi.org/10.12652/Ksce.2014.34.1.0293 |
| Keywords |
표준품셈;실적공사비;토목공사;건축공사;기계설비공사 Standard estimating;Historical unit price;Civil engineering work;Building construction work;Mechanical facility work |
| Abstract |
In concrete structural design provisons, there is a minimum allowable strain of steel to ensure a ductility of RC members and a c/d is limited for the same purpose in EC2. In general, a ductility capacity of RC members is evaluated by a displacement ductility which is a ratio of ultimate displacement to yield displacement, and it is necessary to calculate accurately a yield displacement and an ultimate displacement to evaluate a displacement ductility. But a displacement in members is affected by various member characteristics, so it is hard to calculate a displacement exactly. In this study, a displacement ductility is calculated by calculating a yield displacement and an ultimate displacement through a moment-curvature relationship. The main variables examined are concrete strength, yield strength, steel ratio, spacing of confinement, axial force ratio and concrete ultimate strain. As results, as a concrete strength is increased, a ductility displacement is increased. But as yield strength, steel ratio, spacing of confinement and axial force ratio are increased, a displacement ductility is decreased. And a displacement ductility is necessary to calculate a response modification factor (R) of columns for seismic design, so it is appeared that it is important to calculate a displacement ductility more accurately. |