PIECEWISE EXACT SOLUTION FOR A BRIDGE WITH SLIDING TYPE ISOLATORS UNDER EARTHQUAKES

摘要

In recent years, the earthquake proof technology has been applied to seismic mitigation of structures including buildings, bridges, etc. The bridge system possesses large degree of freedoms, and nonlinear characteristics when structural control devices are involved. Therefore, the analysis for a bridge with nonlinear devices will be time consuming. In this study, a piecewise exact solution for a bridge isolated with sliding type isolators has been derived to simplify the analysis process. In this study, the system is modeled as two degrees of freedom to reasonably represent a large number of degrees of freedom of a bridge with sliding type isolators for obtaining a piecewise exact solution for the system response during earthquakes. In the meantime, the NSAT (Nonlinear Stress Analysis Techniques) computer program has also been used to analyze the response of the bridge with sliding type isolators. By comparing the results from the piecewise exact solution and the NSAT computer program, it can be found that the piecewise exact solution not only simplifies the calculation process, but also obtains the seismic responses of the isolated bridge with good accuracy under earthquakes.