The Research For Stability Analysis Of The Steel-Concrete Composite Frames

Steel-concrete composite frames is a new kind of structutes, Which composed steel columns and composite beams. With the Development and the enhancement in structural design theory and the material performance ,the modern building is taller and its span is longer than before.The stability is a crucial factor.The stability of the steel-concrete composite frames precedes pure steel frames, but the experimentation and theoretical research of stability about composite frames are scanty in China and overseas.The composite frames still adopts the design method of steel frame whithout considering the slip action of floor slab.In this paper, we study the stableness of composite frames.By considering the slip action between floor slab and steel and deduce the composite beam linear stiffness matrix.We establish the new method----QR-method of eigenvalue stability about steel-concrete composite frames.At the end,we compile the releveant programs with C,in Chapter V we analy the nonlinear Stability the steel-concrete composite frames with the ANSYS FEM software.Some valuable conclusions are obtain through some examples,which can offer new calculation method for similar research and design.It is useful reference for optimizing structure, consummating revelant criterions and rules for composite structure.