Abstract
The pounding occurs when the earthquake-induced transverse relative displacement between superstructures and substructures exceeds the initial gap between shear keys and girders or between shear keys and bearing bases.In order to investigate the transverse pounding effect of high-speed railway simply-supported girder bridges under earthquake excitations, taking a 32 m standard-span simply-supported girder bridge as the research object, a single-span bridge model was designed and made with the scale ratio of 1∶6.The influence of the spectral characteristic of the ground motion, peak ground acceleration (PGA), and the initial gap between shear keys and bearing bases on transverse pounding effects was studied through shaking table tests.And the anti-collision effect and isolation mechanism of rubber bumpers were also discussed.The results show that: shaking table tests could reproduce the transverse seismic pounding process of the bridge structure; the fixed bearings were not damaged under the low-level earthquake excitations, and there was no collision phenomenon between the shear keys and the bearing bases; however, the fixed bearings were damaged and most of the test cases collided under the excitations of the design and high-level earthquakes.The pounding between the shear keys and the bearing bases significantly limited the development of the transverse relative displacement between the superstructure and the substructure, but it also aroused high-frequency response of the structure, and hence, amplified the bending moment response at the bottom of the pier.The installation of the rubber bumpers would reduce the pounding stiffness and weaken the high-frequency response of the bridge structure caused by the pounding, thus reduced the seismic responses of the bridge structure.
Key words
high-speed railway /
simply-supported girder bridge /
earthquake /
transverse shear keys /
pounding effects /
rubber bumpers
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MENG Dongliang,GAO Qiong,YANG Menggang.
Shaking table tests on transverse pounding effect of high-speed railway simply-supported girder bridges under earthquake excitations[J]. Journal of Vibration and Shock, 2019, 38(24): 63-73
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