問題詳情
8 雙筋梁斷面設計配筋如下圖所示，已知鋼筋規定降伏強度為 4,200 kgf/cm2，混凝土規定抗壓強度為 280 kgf/cm2，斷面寬度 b=30 cm、底層拉力鋼筋面積 As=39 cm有效深度 d=58.5 cm，經檢核無法符合單筋梁拉力控制斷面。假設壓力筋深度為d' =6.5 cm，若以下圖所示之應變分布為目標，試計算所需之頂層壓力鋼筋面積至少需要：
(A) 5.51 cm2
(B) 6.61 cm2
(C) 7.74 cm2
(D) 8.82 cm2
參考答案
無參考答案
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