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在肋形楼盖中,交叉梁系当两个方向的梁的横截面不同时,现行的计算方法是将主梁(截面较大的)对次梁(截面较小的)的支承当作刚性支承来考虑而忽略该支承变位的影响。由此导致梁系内力的误差是显然的。这种误差当主、次梁两者的线性刚度接近,有时能改变次梁刚性支承时应力的符号。 本文提供考虑了支承变位的计算方法,即将次梁的内力分解为两部分:其一是当作刚性支承产生的力矩和剪力;其二是支承变位产生的力矩和剪力;次梁的内力即是上述两部分之和。文中对第二部分给出了计算公式和数据。
In a ribbed floor, when the cross-sections of beams in two directions are different, the current calculation method is to use the support of the main beam (larger cross-section) as the rigidity of the secondary beam (smaller cross-section). The bearing is considered and the influence of the bearing displacement is ignored. As a result, the error in the internal force of the beam system is obvious. This kind of error can change the sign of the stress when the secondary beams are rigidly supported when the linear stiffnesses of the primary and secondary beams are close to each other. This paper provides a calculation method that takes into account the support displacement, which is to divide the internal force of the secondary beam into two parts: one is the torque and shear force generated as a rigid support; the other is the moment and shear force generated by the support displacement; The internal force is the sum of the above two parts. The formula and data for the second part are given in the article.