Nonlinear Finite Element Analysis Of Reinforced Concrete Two-Way Thin-Slab

Reinforced concrete two-way slab was widely used in industry and civilian construction, especially along with the development of long-span,large space buildings, The span of Reinforced concrete two-way slab became longer and longer, So forecast the deflection of slab in normal stage was very important to direct the project design. At the present time, when calculated the deflection of slab, the elastic thin-slab flexure theory was usually adopted and the support beam was generally seen as the rigid mount ,the deforming of the beam(flexure and twist rotation)was ignored, the difference between calculation result and physical circumstances was biggish. when the method was used, When the span of slab was long and the rigidity of beam is small ,the difference was bigger. So, the nonlinear finite element analysis of Reinforced concrete two-way thin-slab is necessary and the deforming of the beam must be considerate. This paper carried out nonlinear finite element analysis of Reinforced concrete two-way thin-slab of frame construction, which received uniformly distributed load and four sides supported with spring beam in the normal stage. The deforming of the beam's contribution was simplified as the slab's displacement boundary conditions. Thought about the nonlinear finite element calculation modes, slab grid calculation modes ,face distribute load and the methods of putting on distributed load and displacement boundary conditions, finite element programs in every conditions are designed with the combination of incremental and iterative method . The calculation about Reinforced concrete two-way thin-slab of frame work with different load forms, different boundary conditions and different ratio of reinforcement was carried out ,And the results of programs are compared with test result and those of ANSYS. So the rationality of the approach carries out in the paper is confirmed. At last, by nonlinear regression of the results with MAT LAB optimization tool box, formulas in different conditions are summarized. So they can offer references for work.