Experimental Research on Effect of Hoop Reinforcement and Partial Slit of Reinforced Concrete Columns with Secondary Walls

Abstract eng:
Authors report the test results of the 12 specimens of column with side walls and the 10 specimens of column with spandrel walls and hanging walls under repeated horizontal load with fixed axial force. Variables are spacing of hoop, existence of eccentric connection of secondary walls to a column, existence of partial slits between column and secondary walls and difference of load history. In this thesis, a secondary wall is a wall which attaches to the column which is inside a frame of a side wall, a spandrel wall and a hanging wall. Resultantly, the following items are made clear. In case of the column with side walls, when the hoop ratio was high, it was sustained after the maximum capacity that the strength which larger than the simple sum of the strength of the column and the walls. However, when the hoop ratio was low, the strength deteriorated rapidly after the maximum capacity. This showed that the evaluation of the column with side walls could be estimated at two steps. Moreover, the maximum strength deteriorated about 1.6~16.3%, and was not observed the major change by eccentric connection of the side walls in the shear strength and the deformation performance. But, the difference was observed failure property, and the spiral shear crack occurred in the column where the secondary walls eccentric connected. In case of the column with spandrel walls and hanging walls, it becomes the short column and causes brittle shear failure. And when especially the hoop ratio was low, the maximum strength was deteriorated rapidly. In addition, the maximum strength deteriorated about 9%~25% with effect of the torsion moment with eccentric connection. When the partial slit was used in the secondary walls of the column with side walls, spandrel walls and hanging walls, ductility performance of the column was improved, and the reinforcement effect has been verified. Lastly, although the strength can be presumed under some deviation from the existing valuation estimation methods, failure mode can be hardly presumed.

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