Application of rocking mechanism in mitigation of seismic damage on high-rised viaducts
Dr. Yen-Po Wang
|關鍵字:||搖晃機制;高橋墩橋梁;rocking mechanism;high-rised viaduct|
The national highways in the eastern Taiwan under planning are expected to lie in between mountains and valleys. To accommodate the in-situ geographical and scenic conditions, construction of long-span and high-pier viaducts is necessitated. In spite the seismic isolation and energy dissipation technology has been matured in bridge application, the customary seismic isolation design is not applicable to long-span and high-pier viaducts with inherently long-period dynamic characteristics. In this study, the rocking mechanism is introduced for aseismic design of high-pier viaducts. An analytical model for seismic response analysis of A-frame rocking structures is developed. Meanwhile, a series of shaking table tests of a scaled-down rocking pier model has been carried out to verify the effect of rocking mechanism in seismic response mitigation, and the analytical model is modified accordingly. Experimental results show that the rocking mechanism effectively reduces the acceleration response of the superstructure, and the stronger the earthquake, the better the control efficiency. Moreover, numerical simulations show very good agreement with the test results.
|Appears in Collections:||Thesis|