Exact Dynamic Characteristic Analysis of Steel-Concrete Composite Continuous Beams

The free vibration characteristics of steel-concrete composite continuous beams (SCCCBs) are analyzed based on the Euler–Bernoulli beam theory. A modified dynamic direct stiffness method has been developed, which can be used to analyze SCCCBs with some lumped masses and elastic boundary conditions. results obtained by proposed exact due elimination approximated displacement force fields in derivation. is verified comparing its those ANSYS software laboratory tests. Then, influencing factors reduction natural frequency discussed detail using method. show that stronger interfacial interaction higher values as well larger steel subbeam thinner concrete slab. smaller is, more significant effect is. not affected different numbers spans but equal single-span length various ratios side span main total length, it influenced extra length. And only bending stiffness. Furthermore, reasonable ratio 0.9?1.0.