Numerical analysis on longitudinal seismic responses of high-speed railway bridges isolated by friction pendulum bearings
Zhiwu Yu1 , Haiyan Li2 , Biao Wei3 , Lizhong Jiang4 , Jianfeng Mao5
1, 2, 3, 4, 5School of Civil Engineering, Central South University, Changsha, 410075, China
1, 2, 3, 4, 5National Engineering Laboratory for High-speed Railway Construction, Changsha, 410004, China
Journal of Vibroengineering, Vol. 20, Issue 4, 2018, p. 1748-1760.
Received 27 April 2017; received in revised form 13 December 2017; accepted 20 December 2017; published 30 June 2018
Copyright © 2018 Zhiwu Yu, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
As to analyze the effects of friction pendulum bearings (FPB) on the responses of simply supported bridges on a high-speed railway under longitudinal earthquakes, a spatially integrated track-bridge model with a CRTS II slab ballastless track and FPB was established by using the OpenSEES software. The seismic responses under different ground motions were calculated and compared with those using common spherical steel bearings. The comparison results show that the combination of FPB and the CRTS II slab ballastless track is more reasonable. Namely, using FPB can effectively protect the bridge and track structures. Moreover, the rails, fasteners, CA layer and piers are perfectly protected by multi-layer isolation mechanics, induced by FPB and sliding layer, even under strong earthquakes. Finally, 0.05 is identified to be the best value for the friction coefficient of FPB under longitudinal earthquakes.
Keywords: high-speed railway, simply supported bridge, CRTS II slab, friction pendulum bearing, seismic isolation.
This research is jointly supported by the National Natural Science Foundations of China under grant No. 51578549, U1434204, 51778635, 51308549 and 51378504, the Scientific Research and Development Program of China Railway Corporation under SY2016G001, the Natural Science Foundations of Hunan Province under grant No. 2015JJ3159, the Experimental Foundations of Seismic Comprehensive Test for Railway Bridge Piers in High Intensity Earthquake Area from Chengdu to Lanzhou, and Experimental Foundations of Shock Absorber and Block on Railway Bridges. The above support is greatly appreciated.
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