Calculation of Short-Term Deflection of a Composite Slim Floor with Single Span

For the problem of stiffness calculation a composite slim beam with reinforced concrete truss slab as floor slab, short-term deflection is calculated and analyzed by theoretical numerical methods. The result shows that load-deflection curve linear in middle span beam, cross section ideal section. flat can be according to elastic theory. area converted into steel method conversion section, then material mechanics. obtained formula good agreement finite element analysis. load – displacement single simulation using method. nonlinear. In front cracking (the reaches 25% failure load), accord curve, along horizontal deviation, especially when applied 45% breaking load, offset value increase, this match experimental analysis early stage our research team good.