Abstract
Recently, many high strength steel Bars is used in reinforced concrete structure. But, there are no studies solved this question "How high strength steel bars can be utilized effectively in R. C. members?". Solving this question is very important to development of high strength steel bars. This study gives an anser to this question. First, this study proves that steel strength could be utilized effectively in R. C. members have a upper limitation, and that this upper limits is restricted by the following valuable condition Secondary, in this study, this upper limitation restricted by the following conditions is analyzed by theoletical caluculation conditions considered in this study (1) Ultimate bending strength of Beam and Column. (2) Bending ductility of beam and column. (3) Shear strength of beam and column. (4) Shear failure of beams and columns conection. (5) Reduction of Bending strength by the fars settled through the beams and column ccnection. (6) Anchor failure of bend bars. (7) Allowable crock width. (8) Allowable deflection of beam (9) Allowable deflection of column at earthquake.
