To apply the research results to the design and the construction of the high rise buildings, long-term behavior of reinforced concrete structure have been widely studied. However, shoring and reshoring at early ages have not been considered in the most of studies. The removal of forms and shores has been dealt with one construction sequence. i.e. the deformation occurred at the early age before the removal of shore has been neglected. In this paper, two-dimensional frame analysis program for long-term behavior of reinforced concrete was developed. In the developed program, construction sequence including the settlement and the removal of shores is considered to predict axial force variation due to forms ,shores, and time-dependent concrete stiffness. Analysis results show that the time-dependent axial force of shores is reduced, and the redistributed axial force of the interior column is greater than the value by elastic analysis and that of the exterior column is smaller. In order to demonstrate the validity of this program, the test frame was constructed in sequence of the placement of concrete, form removal, reshoring, shore removal, and the application of additional load. The proposed program predicts experimental results well.
long-term deformation;shore;form;reshoring;construction sequence;redistribution of axial force;
Engineering Bulletin No.EB108D, 1987.
ACI SP-117, 1989.
한국콘크리트학회 가을학술발표회 논문집, 1997.
대한토목학회 논문집, 1998.
대한건축학회 논문집, 1998.
ACI Journal, 1986.
ACI Journal, 1963.
Finite Elements for Structural Analysis, 1984.
Computers and Structures, 1993.
ACI Manual of Concrete Practice(ACI 209R-82), 1990.