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一、推荐方法的一般描述 本文所描述的方法只涉及到处理非开裂的钢筋混凝土或预应力混凝土构件。从原则上讲,这种方法与由两种材料所组成的构件,即当一种材料(钢筋)的温度保持不变而另一种材料(混凝土)却发生温度改变的弹性应力分析相类似。 在钢筋和混凝土内因徐变和收缩所形成的与时间相关的(以下均缩写为“时间相关”)力是逐渐发展的。混凝土对逐渐变化的应力的反应最好用巴赞特(Bazant)的龄期修正有效模量公式计算:
I. GENERAL DESCRIPTION OF RECOMMENDED METHODS The method described in this article deals only with non-cracking reinforced concrete or prestressed concrete components. In principle, this method is similar to that of a member consisting of two materials, that is, an elastic stress analysis in which the temperature of one material (steel bar) remains the same while the temperature of the other material (concrete) changes. The time-dependent (hereinafter abbreviated “time-dependent”) forces developed in the rebar and concrete due to creep and shrinkage are evolving. The concrete’s response to changing stresses is best calculated using the age-adjusted effective modulus formula from Bazant: