Reinforcement selection issue

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This post was last edited by strongerlihe on 2010-12-21 at 15:37. In a recent project, the client raised objections regarding the choice of rebar for the office building. The power plant’s comprehensive office building, 3 floors. Designed for a seismic intensity of 7 degrees. Grade 2 rebar is selected for the foundation. Reinforcement for beams and columns shall use grade 3 steel bars. The owner believes that grade 3 rebar is only used in buildings with 10 floors or more. It should all be changed to grade 2 rebar. The structural engineering team believes that the price difference between grade 2 and grade 3 steel bars is not significant at present. The basic reinforcement is for structural purposes; the total amount used is taken into account. The same amount of grade 2 and grade 3 steel is used, with grade 3 being slightly more expensive, so grade 2 is chosen. As for the reinforcement in beams and columns, since the strength of grade 3 steel is slightly higher than that of grade 2 steel, the total amount of reinforcement required is approximately 20% less compared to using grade 2 steel. The price of grade 3 rebar is about 5% higher than that of grade 2 rebar. Considering all factors, grade 3 steel bars are economical and practical. Moreover, **grade 3 rebar is currently recommended for use. The owner doesn’t seem to agree! Please share your opinions! Is it exactly like this? Is it a problem with the owner or with the structural engineering?