Abstract: With reference to the slab strip model in the ACI building code and by using the finite element method‚the behavior of a wide-flat beam-slab structure under vertically load was investigated．The variation of the distribution co-efficients of the column-strip bending moments with beam width‚beam height‚slab thickness‚grid span and column section size‚as well as the bending moment ratices of the beam were presented．By the variation analysis of the distri - bution coefficients vs．the relative stiffness coefficient‚it is found that the moment distribution in column strips could not be discussed only according to the relative stiffness coefficient and the grid span ratio in two directions‚just like that in ACI building code‚that beam width is also a very important variable for the wide-flat beam-slab structure．on the basis of the above analysis results‚a calculation approach of inner force for wide-flat beam-slab structure was pro-posed．

Key words:  flat beam-slab, shallow beam, vertical load, slab strip, bending moment distribution coefficient, finite element method