Research on Combination of Seismic and Temperature Action Effects of Multi-span Long Continuous Girder

In order to reduce the seismic response of the multi-span long continuous girder under strong ground motions, the system mostly use seismic isolation bearings. Under the action of annual temperature difference, the bearings will produce an initial displacement, which changes the initial balance position of the structure and increases the demand of bearing displacement. The combination of seismic and temperature action belongs to the superposition of multiple random processes, and the code does not give a clear combination coefficient. Based on Turkstra combination method, this paper calculates the combination coefficient of temperature action in the seismic design. Through finite element analysis, it compares the response of the isolation system with friction pendulum support and cable-sliding friction aseismic bearing under the combination of seismic and temperature action.