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本文对钢筋混凝土与预应力混凝土(包括无粘结预应力混凝土)受弯构件开裂后短期刚度的统一计算方法进行了研究。对以往试验研究中截取的纯弯段相对长度对试验结果的影响,在理论上作了定量分析。根据钢筋混凝土结构的基本理论与变形等效的原理,提出了各类混凝土受弯构件开裂后短期刚度的统一计算公式,在一个统一变量—开裂截面受压区高度的基础上,本文结果能够使各类受弯构件开裂后的短期刚度分析和计算相互衔接。本文公式有良好的计算精度。
In this paper, the uniform calculation method for the short-term stiffness of reinforced concrete and prestressed concrete (including unbonded prestressed concrete) cracked members after cracking is studied. The theoretical analysis of the influence of the relative length of the purely curved section intercepted in previous experimental studies on the test results was performed. According to the basic theory of reinforced concrete structures and the principle of equivalent deformation, a unified formula for the short-term stiffness of various types of concrete flexural members after cracking is proposed. On the basis of a uniform variable—the height of the compression zone of cracked sections, the results of this paper can Short-term stiffness analysis and calculation after cracking of various types of bending members are linked to each other. This formula has good calculation accuracy.