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四、使用条件下钢筋混凝土连续梁的计算1. 抗弯刚度模型根据前人大量的研究结果,钢筋混凝土梁的抗弯刚度可用三线性模型模拟,三直线的转折发生在裂缝出现和受拉钢筋屈服时。三个刚度分别为混凝土徐变引起钢筋混凝土构件截面内混凝土应力的松弛,导致变形增大,截面抗弯刚度的降低。在使用条件下,截面内受压区混凝土应力一般处于小于0.5f_c应力状态下,故可近似地按照线性徐变计算徐变的影响。
IV. Calculation of reinforced concrete continuous beams under conditions of use 1. Bending stiffness model According to previous research results, the flexural rigidity of RC beams can be simulated by a trilinear model. The transition of three straight lines occurs in the presence of cracks and tensile reinforcement. When yielding. The three stiffnesses are the concrete creep caused by the relaxation of the concrete stress in the section of the reinforced concrete member, which leads to an increase in the deformation and a decrease in the bending stiffness of the section. Under the conditions of use, the concrete stress in the compression zone in the section is generally less than 0.5f_c stress, so the influence of creep can be calculated approximately according to the linear creep.