| Co-Investigator(Kenkyū-buntansha) |
MAEDA Masaki Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (30262413)
NAKAJI Hiroyuki Toyohashi University of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (80314095)
KAKU Tetsuzo Toyohashi University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (40026092)
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| Research Abstract |
In order to realize simplification and cost reduction in construction works for SRC structures, concrete encased steel structures consisting of only steel and concrete, hereafter.referred to as CES structures, have been proposed by the authors. In the feasibility study to examine the structural performance of CES columns, it was conformed that damages of the columns with an increase of lateral deformation can be reduced by using high performance fiber reinforced cementitious composites, HPFRCC, instead of normal concrete. Moreover, the hysteretic characteristics of the CES columns were almost the same as those of SRC columns. However, significant reduction of the initial stiffness in the shear-drift relations and the development of drying shrinkage in the cover concrete were observed in the CES columns due to use of HPERCC without aggregates. In addition, the production and casting of HPFRCC were very difficult due to less workability.
In this study, use of fiber reinforced concrete, FR
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C, for CES columns has been planed to solve the above-mentioned problems in the columns using HPFRCC. In the 2002 fiscal year, proportioning tests of FRC using three types of fibers were conducted to obtain appropriate one for both the construction works and structural performance of CES structures. Then, using FRC selected from the proportioning tests, a total of tree CES columns were tested to investigate the structural performance and compare with the columns using HPFRCC. In the 2003 fiscal year, then, three CES columns using FRC were tested to investigate the effect of the level of axial force applied on-the seismic performance of the columns.
From these tests, the following conclusions are obtained.
1)CES columns using FRC have almost the same structural, performance as SRC columns which possess an excellent earthquake resistance with high capacities and deformability.
2)The use of FRC make the easy restoration of CES columns possible because the damages in cover concrete of the columns due to flexural and shear cracks are relatively light even at the large story drifts.
3)CES columns using FRC is practical in the aspects of not only the structural performance but also the construction workability because the FRC can be easily produced by real concrete mixers. Less
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