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本文根据迭合梁在使用阶段与条件相同的整体梁弯矩-曲率关系大致呈平行的特点,考虑迭合梁的受力特性,分别建立了钢筋混凝土和预应力混凝土迭合梁在短期荷载下的总刚度公式 B_d。本文 B_d 也可以表示整体梁的刚度,从而使两者统一为一个计算公式;对预应力混凝土迭合梁,且能使当 k_f=1时刚度公式与朱开裂的刚度公式相衔接。用本文 B_d 计算迭合梁的挠度,其精度此现行方法要好,计算工作量也大为减少。
In this paper, according to the characteristics that the bending moment-curvature relationship of the whole beam of the same beam in the use phase and the condition is roughly parallel, considering the force characteristics of the laminated beam, the reinforced concrete and prestressed concrete laminated beams are established under short-term load. The total stiffness formula B_d. In this paper, B_d can also represent the stiffness of the whole beam, so that the two are unified as a calculation formula; for prestressed concrete laminated beams, and when k_f=1, the stiffness formula and the cracking stiffness formula of Zhu are connected. Calculate the deflection of the laminated beam using this paper B_d, the accuracy of the current method is better, and the calculation workload is greatly reduced.