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预应力混凝土构件有什么特点?

问答题
2022-01-02 22:42
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正确答案

预应力混凝土构件具有以下特点:
(1)在正常使用条件下预应力混凝土构件挠度小,不产生裂缝,因而具有较好的耐久性。
(2)在相互荷载作用下,预应力混凝土构件的截面可以设计的小一些,所以可节省钢材,减轻自重。
(3)在预应力混凝土构件中,钢筋从张拉到破坏,始终处于高应力状态。所以预应力混凝土构件必须采用高强钢丝,从而相应地减少钢筋的截面积,节省钢材。
(4)预应力混凝土构件受拉区中的钢筋始终处于高拉应力状态,而混凝土则在外荷载抵消预压应力之前始终处于受压状态,所以预应力混凝土构件充分发挥了钢筋和混凝土两种材料的特长。
(5)预应力混凝土构件具有较好的抗裂度和刚度。


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