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【简答题】
已知某T形截面梁，弯矩设计值M=450kN·m，梁的截面尺寸为b×h=200mm×600mm，b' f =1000mm，h' f =90mm；混凝土等级为C25，钢筋采用HRB335，环境类别为一类。求受拉钢筋截面面积A s 。
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