構造目地を有する鉄筋コンクリート造腰壁付き骨組の力学的特性に関する研究 : そのII-腰壁付き梁の力学的特性と曲げ強度評価式

抄録

In this study, the discussion is focussed on seismic behavior of reinforced concrete beams with a gap, called the "Structural Slits" in this paper. The purpose to provite the Structural Slits is to mitigate the undesirable effects of spandrels on reinforced concrete frames, such as failure of columns during an earthquake. In the previous report (part I), the influence of Structural Slits on the strength and the behavior of a reinforced concrete frame was described. In this paper, the flexural strength and the behavior of spandrel-beams with the Structural Slits are described and the equations to estimate the flexural strengths of the beams are presented. The conclusions of this paper are summarized as follows. (1) The load-displacement relationship for the spandrel-beams with the Structural Slits are influenced by the location of neutral axis due to flexure at the ultimate state of the Structural Slits. A maximum flexural strength of the spandrel-beams is equal to the ultimate loads of the Structural Slits in case where the neutral axis locates in the spandrels, and also equal to the strength of beam due to yielding of reinforcing bars in case where the neutral axis locates in the beam. (2) The equations proposed in this paper are available to estimate adequately the flexural strengths of spandrel-beams with the Structural Slits.