| 摘要 |
PROBLEM TO BE SOLVED: To provide a reinforced concrete structure capable of obtaining sufficient strength without increasing the amount of reinforcement.SOLUTION: An inner reinforcement material 22 of a box culvert 1 comprises: both end parts 22b with yield point or 0.2% proof stress corresponding to a normal strength part specified by JISG3112; and a central part 22a corresponding to a high strength part, which is placed between these end parts 22b, and the inner reinforcement material is made by partly hardening a piece of normal reinforcing bar. The central part 22a corresponding to the high strength part is arranged to respond to the part with preset bending moment value ranging from the maximum value to 0.SELECTED DRAWING: Figure 2 |
