论文部分内容阅读
本文推导了钢筋混凝土梁、预应力混凝土梁、钢筋混凝土迭合梁和预应力混凝土迭合梁的抗裂度计算公式,经过对后一种梁的试验表明,计算值与试验值符合较好。兹将计算方法与试验情况介绍如下。一、抗裂弯矩1. 预应力混凝土迭合梁预应力混凝土迭合梁应变变化过程如图1,裂缝出现时计算简图如图2。对于第一种情形即σ_1~t为压应力时,则在压应力图上补上一块合力为R的梯形应力图,使其成为完
This paper deduces the formulas for calculating the cracking resistance of reinforced concrete beams, prestressed concrete beams, reinforced concrete laminated beams and prestressed concrete laminated beams. After the test of the latter beam, the calculated values are in good agreement with the experimental values. The calculation method and test situation are described below. 1. Crack-resistance bending moment 1. The strain evolution process of prestressed concrete laminated beams of prestressed concrete laminated beams is shown in Fig. 1. The calculation diagram of cracks appears as shown in Fig. 2. For the first case where σ_1~t is a compressive stress, a trapezoidal stress map with resultant force R is added to the compressive stress diagram to make it complete.