Analysis for Dynam ic Properties ofM odelArch Structure ofConcrete-Filled SteelTube

The natural frequencies of amodel arch structure of concrete-filled steel tube were got by shaking table tests. In addition, a structural analysis software SAP2000 and the finite elementmethod were used to obtain the natural frequencies and vibration modes of the structure. In the numerical analysis three dimensional beam elementswere adopted and concrete-filled steel tube was taken as a combinatorialmateria.l The computed results get a good agreementwith the experimental ones. To extend the research, the dynamic properties of themodel arch structurewere analyzed under different cases. Through changing the structural stiffness, the numberof lateralbraces and fixed conditions, the changes of the natural frequencies and vibration modes were researched and factors influencing the dynamic properties of concrete-filled steel tubular arch structureswere analyzed. The resultshows that increasing lateralbraces can increase the lateral frequencies of an arch structure, the stiffness of arch rib is not an important influencing factor to its natural frequencies.