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本文提出了无粘结部分预应力矩形截面受弯构件短期刚度的计算公式。该公式的推导分两个步骤。首先,对363根模拟构件用非线性分析方法进行模拟计算。然后,根据模拟计算结果确定影响刚度的主要因素,并通过数学回归求得其量值关系,从而求得刚度计算公式。公式的物理概念较清楚,计算较简便。通过对近期的12根试验梁以及过去的15根试验梁的实测挠度与计算结果比较表明,公式的精度是满意的。
This paper presents a formula for calculating the short-term stiffness of unbonded partially prestressed rectangular section flexural members. The derivation of this formula is divided into two steps. First, 363 simulation components were simulated using nonlinear analysis methods. Then, according to the results of simulation calculation, the main factors affecting the stiffness are determined, and the magnitude relationship is obtained through mathematical regression, so as to obtain the formula for calculating the stiffness. The physical concept of the formula is clearer and the calculation is simpler. Through the comparison of the measured deflections of the recent 12 test beams and the past 15 test beams, the accuracy of the formula is satisfactory.