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http://dx.doi.org/10.12989/sss.2019.23.5.449

Performance of passive and active MTMDs in seismic response of Ahvaz cable-stayed bridge  

Zahrai, Seyed Mehdi (Center of excellence for Engineering and Management of civil Infrastructures, School of Civil Engineering, College of Engineering, University of Tehran)
Froozanfar, Mohammad (Center of excellence for Engineering and Management of civil Infrastructures, School of Civil Engineering, College of Engineering, University of Tehran)
Publication Information
Smart Structures and Systems / v.23, no.5, 2019 , pp. 449-466 More about this Journal
Abstract
Cable-stayed bridges are attractive due to their beauty, reducing material consumption, less harm to the environment and so on, in comparison with other kinds of bridges. As a massive structure with long period and low damping (0.3 to 2%) under many dynamic loads, these bridges are susceptible to fatigue, serviceability disorder, damage or even collapse. Tuned Mass Damper (TMD) is a suitable controlling system to reduce the vibrations and prevent the threats in such bridges. In this paper, Multi Tuned Mass Damper (MTMD) system is added to the Ahvaz cable stayed Bridge in Iran, to reduce its seismic vibrations. First, the bridge is modeled in SAP2000 followed with result verification. Dead and live loads and the moving loads have been assigned to the bridge. Then the finite element model is developed in OpenSees, with the goal of running a nonlinear time-history analysis. Three far-field and three near-field earthquake records are imposed to the model after scaling to the PGA of 0.25 g, 0.4 g, 0.55 g and 0.7 g. Two MTMD systems, passive and active, with the number of TMDs from 1 to 8, are placed in specific points of the main span of bridge, adding a total mass ratio of 1 to 10% to the bridge. The parameters of the TMDs are optimized using Genetic Algorithm (GA). Also, the optimum force for active control is achieved by Fuzzy Logic Control (FLC). The results showed that the maximum displacement of the center of the bridge main span reduced 33% and 48% respectively by adding passive and active MTMD systems. The RMS of displacement reduced 37% and 47%, the velocity 36% and 42% and also the base shear in pylons, 27% and 47%, respectively by adding passive and active systems, in the best cases.
Keywords
cable-stayed bridge; seismic; MTMD; near-field and far-field earthquakes; vibration control; passive and active; genetic algorithm; fuzzy logic;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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