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一、引 言 在钢筋混凝土结构中,通常按简化理论来计算双肋式的直线板梁(图1)。首先使荷载按杠杆原理分布至两根主梁;然后对每根纵梁进行受弯分析。 显然,这一方法没有计及扭转;很明显,双肋式直线板梁在计算上能够在体系任一位置不出现扭矩的情况下承受偏心荷载。事实上,“杠杆原理法”就相当于如下假定:在忽略抗扭刚度的纵梁上支承着完全无抗扭能力的板。
I. INTRODUCTION In reinforced concrete structures, two-rib linear slab beams are usually calculated according to the simplified theory (Figure 1). First of all, the load is distributed to two main beams according to the principle of lever; then the bending analysis of each longitudinal beam is carried out. Obviously, this method does not take account of the twisting; obviously, the double ribbed straight slab is computationally capable of withstanding eccentric loads without the occurrence of torque at any point in the system. In fact, the “Leverage Method” is equivalent to the assumption that a fully torsion-free plate is supported on a side member that neglects the torsional stiffness.