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The shear pin strength of friction pendulum bearings (FPB) in simply supported railway bridges

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Abstract

The friction pendulum bearings (FPB) begin to be used in railway bridges in China. In one earthquake region in China, the shear pins of FPB are required to be well to provide the enough shear force and stiffness under service loads (such as the vehicle forces being less than 170 kN in the longitudinal direction and 40 kN in the transverse direction) or small earthquake loads with a peak ground acceleration (PGA) being less than 0.1 g, however, are cut off to isolate seismic energy under large earthquake loads with a PGA being larger than 0.2 g. It is necessary to identify the appropriate strength of FPB shear pin to satisfy the above requirements. This paper selected the simply supported bridges on a single-line railway in the above earthquake region as the study object, which had a span length of 32 m and two height types of piers (8 m and 25 m). A prototype finite element model (FEM) and a scaled FEM were numerically analyzed, and a scaled experimental model was tested on shake table for each bridge. The results of them were compared with each other to validate the rationality of all models and to achieve the appropriate strength of FPB shear pin. The results show that the appropriate strengths of FPB shear pins are 540 kN in the longitudinal direction and 300 kN in the transverse direction for the bridge with the pier height of 8 m. Likewise, 350 kN and 270 kN are determined as the appropriate strengths of FPB shear pins for the bridge with the pier height of 25 m in the longitudinal and transverse directions, respectively. The numerical method of FEM is correct based on the experimental validation, and can be used to identify the appropriate strengths of FPB shear pins for other railway bridges.

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Acknowledgements

This research is jointly supported by the Science and Technology Project of Sichuan Province Under Grant No. 2019YFG0048, the National Natural Science Foundations of China Under Grant Nos. 51778635 and 51778630, the Natural Science Foundations of Hunan Province Under Grant No. 2019JJ40386, the Research Program on Displacement Limitation Technology of Half-through Railway Arch Bridge Under Grant No. science2018-81. The above support is greatly appreciated.

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Correspondence to Biao Wei.

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Jiang, L., He, W., Wei, B. et al. The shear pin strength of friction pendulum bearings (FPB) in simply supported railway bridges. Bull Earthquake Eng 17, 6109–6139 (2019). https://doi.org/10.1007/s10518-019-00698-x

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