【单选题】【消耗次数：1】
钢筋混凝土T形和I形截面剪扭构件可划分成矩形块计算，此时（）。
①
腹板承受截面的全部剪力和扭矩；
②
翼缘承受截面的全部剪力和扭矩
③
截面的全部剪力由腹板承受，截面的全部扭矩由腹板和翼缘共同承受
④
截面的全部扭矩由腹板承受，截面的全部剪力由腹板和翼缘共同承受
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钢筋混凝土 T形和I形截面剪扭构件可划分为矩形块计算，此时（ ）。
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腹板承受全部的剪力和扭矩
②
扭矩由腹板承受，剪力由腹板和翼缘共同承受
③
剪力由腹板承受，扭矩由腹板和翼缘共同承受
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翼缘承受全部的剪力和扭矩
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计算公式建立的基本原理不同
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受拉区与受压区截面形状不同
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混凝土受压区的形状不同
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受弯构件正截面承载力中，T形截面划分为两类截面的依据是（??）。
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