Research on new energy dissipation anti-drop-beam device for railway bridge in high seismic intensity area

Abstract:

In view of the limitation of the traditional anti-drop-beam devices of railway bridges, a new corrugated steel energy dissipation anti-drop-beam device was developed for railway bridges in high earthquake intensity areas. The formula for calculating the mechanical properties of corrugated steel energy dissipation anti-drop-beam device was deduced and established. A simplified design method of energy dissipation anti-drop-beam device for railway bridges was proposed, and the design and analysis software of the device was developed. The mechanical performance test of the energy dissipation anti-drop-beam device was carried out. Taking a typical long-span continuous beam in an eight-degree earthquake intensity region of Chongqing-Kunming high-speed railway as the research object, the energy dissipation anti-drop-beam device of the bridge was designed, and the impact of the device on the seismic performance of the bridge was analyzed. Results show that the design method and mechanical parameter calculation theory of the new energy dissipation anti-drop-beam device had strong adaptability and high calculation precision, which met the accuracy requirement of engineering applications. The hysteretic curve of the anti-drop-beam device was full, the energy dissipation ability was enhanced, and the low cycle fatigue performance was good. The designed energy dissipation anti-drop-beam device could meet the seismic performance requirements of high-speed railway long-span bridges, with good effect of shock absorption and energy dissipation, which could reduce the end displacement of long-span continuous girder bridge by about 25%.