SEMI-ACTIVE CONTROL OF CURVED BRIDGE UNDER MULTI-COMPONENT AND MULTI-SUPPORT EARTHQUAKE

The finite element model of curved beam bridge is established, and semi-active control devices are applied. The influence of multi-component and multi-support ground motion and earthquake excitation angle on vibration mitigation rate is analyzed. The results indicate that the mitigation rate of semi-active limit Hrovat control algorithm approaches with the active LQR method, and semi-active dampers are effective in reducing the bridge response. However, the rate can be decreased by multi-component and multi-support effect of earthquake, and the effect of excitation angle and multi-support excitation are coupled. It is recommended that in the design of semi-active control system, multi-component and multi-support effect should be taken into account with excitation angle along with the chord axis of the bridge in order to guarantee the control effect. The research provides theoretical basis of curved bridge using semi-active devices.