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前言预应力钢筋混凝士的主要优点是能提高混凝士的抗裂性,从而能有效地采用高强度的钢和混凝土,以节省材料,并减轻自重和高度,使钢筋混凝土的应使范围日益扩大。例如在桥梁方面,苏联有些专家已有这样的意见:钢梁只是在修建特大桥,如跨度超过120～150~M 以及在地质条件特坏的时候才应该使用。至于跨度在110~M 以下的桥梁则应该改用装配式钢筋混凝土(其中包括预应力钢筋混凝土)。现在苏联有很多专家正在向这一方向进行着规模巨大的研究。预应力的原理虽然在人类工程实践和日常生活中的应用是很早的[22,23]。但直到
Preface The main advantages of prestressed reinforced concrete are the ability to increase the crack resistance of the concrete and thus the efficient use of high strength steel and concrete to save material and reduce the weight and height of the concrete so that the range Growing. For example, in terms of bridges, some experts in the Soviet Union already have the opinion that steel beams are only used for the construction of super-large bridges, for example, when the span exceeds 120-150 m and when the geological conditions are particularly bad. As for bridges spanning below 110 to M, prefabricated reinforced concrete (including prestressed reinforced concrete) should be used instead. Now many experts in the Soviet Union are making a huge study in this direction. Although the principle of prestress is very early in the application of human engineering practice and daily life [22,23]. But until