线荷载作用下混凝土双向板的挠度分析

Influence of Line Load on the Deflection Performance of Reinforced Concrete Two-way Slab

钢筋混凝土双向板在工业与民用建筑中应用十分广泛,随着板的应用跨度日益增大,常常遇到板上作用有集中线荷载的情况,预测板在使用阶段的挠度对指导工程设计具有重要的意义。目前在工程中通常按线弹性薄板小挠度理论计算板的变形值,所得计算结果与实际情况偏差较大。为此,在分析钢筋混凝土双向板的挠度时,有必要考虑材料非线性特性。本文研究了有线荷载作用的混凝土双向板在正常使用阶段的挠度计算方法,着重探讨了四边固支混凝土双向板的抗弯刚度计算。通过简化板在相应边界条件下的位移函数,得到了混凝土双向板的挠度计算公式,并与ANSYS软件计算结果进行了比较。最后对双向板挠度的影响因素进行了分析。

Reinforced concrete two-way slabs are widely used in industry and civilian constructions, with the widely application of long-span, the slab often has line load works on it. Hence, the slab predicted in the use phase of the deflection has important significance on engineering design. At the present, the elastic thin-slab flexure theory is usually adopted when calculating the deflection of slab. These result in the huge difference between calculation results and practical circumstances. Therefore, it is necessary for the nonlinear analysis of reinforced concrete two-way thin-slab. In this paper, the calculation of the deflection of reinforced concrete two-way slabs is focused on the deflection calculate method of four sides clamped cracks in concrete strip of two-way stage. The anti-crack calculation and deduced the two-way slab stiffness formula including four sides were derived. On the Bases of the simplified corresponding slab boundary conditions of displacement function, a two-way cross-sheet deflection formula can be obtained, and the calculation results are compared with that of ANSYS. Finally, the factors of two-way deflection plate are analyzed.