Study on self-vibration characteristics of half-through reinforced concrete arch bridge

Abstract：By using Generic-software ANSYS, numerical simulation analyzing has been done to the dynamics characteristic of a half-through reinforced concrete arch bridge, and the dynamic parameters such as self-vibration frequencies, modes etc, are gotten, as well as its modes characteristics.Meanwhile, influence to the structure-dynamics characteristic was analyzed by varying primary structural parameters of the arch bridge.The results show that self-vibration frequencies have a marginal improvement with rise/span ratio decreased.The transverse support will help to enhance the lateral rigidity, to reduce its out arch-plane vibration and improve the stability in wind.The frequency of each vibration mode has been increased in a approximate linearity with the improvement of arch stiffness, and arch stiffness can be changed to adjust its vibration characteristics.The results can offer reference to seismic design of the similar bridge.

Keyword：half-through reinforced concrete arch bridge;self-vibration characteristics;rise/span ratio;transverse support;rigidity of arch rib;