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以我国现行规范JGJ92-2004《无粘结预应力混凝土结构技术规程》推荐的无粘结预应力混凝土受弯构件的裂缝宽度计算公式为基础,同时参考美国混凝土结构设计规范ACI318-08关于无粘结预应力混凝土受弯构件裂缝控制的有关设计规定,提出了无粘结预应力混凝土受弯构件裂缝宽度计算的一种简便算法.该方法的基本思路是:将无粘结预应力钢筋的有效预拉力作为构件截面外力,从而将无粘结预应力混凝土受弯构件的裂缝宽度计算转化为普通钢筋混凝土受弯构件的裂缝宽度计算.采用该方法得到的计算值与已收集到的84组无粘结预应力混凝土受弯构件裂缝宽度的试验值吻合较好,验证了所建议公式的合理性,可供我国相关规范今后修订时参考.
Based on the calculation formula of the crack width of unbonded prestressed concrete flexural members recommended by JGJ92-2004 “Non-bonded Prestressed Concrete Structure Technical Specification” of our country, reference is also made to the specification of ACI 318-08 of American Concrete Structure Design Knot prestressed concrete flexural members of the crack control of the design requirements, put forward a unbonded prestressed concrete flexural member crack width calculation of a simple method.The basic idea of this method is: unbonded prestressed reinforcement effective Prestressing force is taken as the component external force of the member to calculate the crack width of the unbonded prestressed concrete flexural member into the crack width of the common reinforced concrete flexural member.The calculated value obtained by this method is compared with the 84 groupless The experimental values of the crack width of flexural members with prestressed concrete are in good agreement with each other, which verifies the rationality of the proposed formulas and is available for future reference when our relevant norms are revised.