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Structural Engineering and Mechanics
  Volume 70, Number 2, April25 2019 , pages 143-152

Spatially variable effects on seismic response of the cable-stayed ‎bridges considering local soil site conditions
Zeliha Tonyali, Sevket Ates and Suleyman Adanur

    In this study, stochastic responses of a cable-stayed bridge subjected to the spatially varying earthquake ground motion are investigated for variable local soil cases and wave velocities. Quincy Bay-view cable-stayed bridge built on the Mississippi River in Illinois, USA selected as a numerical example. The bridge is composed of two H-shaped concrete towers, double plane fan type cables and a composite concrete-steel girder deck. The spatial variability of the ground motion is considered with the coherency function, which is represented by the components of incoherence, wave-passage and site-response effects. The incoherence effect is investigated by considering Harichandran and Vanmarcke model, the site-response effect is outlined by using hard, medium and soft soil types, and the wave-passage effect is taken into account by using 1000, 600 and 200 m/s wave velocities for the hard, medium and soft soils, respectively. Mean of maximum response values obtained from the analyses are compared with those of the specific cases of the ground motion model. It is concluded that the obtained results from the bridge model increase as the differences between local soil conditions cases of the bridge supports change from firm to soft. Moreover, the variation of the wave velocity has important effects on the responses of the deck and towers as compared with those of the travelling constant wave velocity case. In addition, the variability of the ground motions should be considered in the analysis of long span cable-stayed bridges to obtain more accurate results in calculating the bridge responses.
Key Words
    wave-passage effect; incoherence effect; site-response effect; stochastic response; cable-stayed bridge; spatially varying earthquake ground motion
Zeliha Tonyali: Department of Civil Engineering, Recep Tayyip Erdogan University, 53100, Rize, Turkey
Sevket Ates and Suleyman Adanur: Department of Civil Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

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