Abstract
In order to mitigate the seismic response of a cable-stayed bridge, a new type damping device named asymmetric pounding tuned mass damper (APTMD) is developed in this paper on the basis of the traditional symmetric pounding tuned mass damper. The novel APTMD has three parameters to be determined: the left-side gap, the right-side gap, and the frequency ratio. A numerical model of the APTMD damping system is established with consideration of both the computational efficiency and accuracy to enable the parametric optimization of the damper. The numerical model is based on a simplified model of the cable-stayed bridge and a nonlinear pounding force model. The genetic algorithm is utilized for the optimization of the damper. Afterwards, the cable-stayed bridge is subjected to 20 recorded ground motions to evaluate the vibration control effectiveness of the APTMD. Four systems are considered: (1) without dampers; (2) with a TMD; (3) with a PTMD; and (4) with an APTMD. Time history analysis reveals the following: (1) those dampers can all effectively suppress the vibration of the bridge and (2) the vibration control effectiveness of the APTMD is slightly better than the TMD and the PTMD.
Highlights
Cable-stayed bridges, typical long-span structures used in modern traffic and transportation systems, are featured by their large flexibility and low damping
Structural damage induced by earthquakes has been extensively reported and investigated [1,2,3,4]. erefore, it is of great necessity to reduce the seismic responses of a bridge and so as to improve its safety and reliability
E seismic isolation technique is one of the most efficient vibration control techniques and its effectiveness has been verified by numerous numerical simulations and experimental investigations. e seismic isolation technique often employs flexible bearings to isolate the superstructure from its foundations and interrupt the energy transfer between the superstructure and substructure. e most commonly adopted base isolators include lead rubber bearings (LRB) and friction pendulum systems (FPS), both exhibiting large vertical stiffness and low horizontal stiffness
Summary
Cable-stayed bridges, typical long-span structures used in modern traffic and transportation systems, are featured by their large flexibility and low damping. Gur et al [13] proposed to incorporate the base isolators with thermally modulated SMA damper, of which the temperature is altered during loading-unloading cycles to improve the energy dissipation It is demonstrated by a numerical simulation that the thermally modulated shape memory alloy friction pendulum (tmSMA-FP) showed improved control efficiency compared with the regular FPS and SMA-FPS. A new passive damping device named pounding tuned mass damper (PTMD) was proposed for vibration control of flexible structures such as power transmission towers [30, 31], high-rise buildings [32], subsea pipelines [33, 34], and bridges [35,36,37]. With the inspiration of the SSPTMD, a novel damper called asymmetric pounding tuned mass damper (APTMD) is proposed in this paper Compared with the former symmetric PTMD, the two gaps of the APTMD can be set to different values. This paper concludes with a discussion of the overall results and suggestion for future studies
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