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按苏联建筑规范СНйПⅡ-21-75规定,预应力配筋适用于标号不低于200号的多孔骨料混凝土构件。在某些构件的设计中,在有充分依据的条件下,最低设计标号允许降低一档(即降低50公斤/厘米~2),所以,目前如无充分依据还不能将预应力应用于隔热结构混凝土。然而,在许多场合下,为了减小构件的变形又往往有必要在隔热结构混凝土中采用预应力,例如,在混凝土设计标号为150号、长12米的墙板中采用预应力配筋便可取消加劲肋,从而简化墙板的结构,且使每平米墙板的造价节省0.8卢布。采用预
According to the Soviet Building Code СНй ПII-21-75, prestressed reinforcements are suitable for porous aggregate concrete members with a number of not less than 200. In the design of some components, the minimum design number is allowed to be reduced by one gear (ie, 50 kg/cm~2) under well-founded conditions. Therefore, if there is no sufficient basis at present, prestressing can not be applied to heat insulation. Structural concrete. However, in many cases, in order to reduce the deformation of the components, it is often necessary to use prestressing in the heat-insulating structural concrete. For example, prestressed reinforcements are used in wall plates of concrete design number 150 and length 12 meters. The stiffening ribs can be omitted to simplify the structure of the wallboard and to save 0.8 rubles per m2 of wallboard cost. Adopt pre