摘要
The high-speed railway track-bridge system(HSRTBS)is susceptible to damage under the effects of earthquakes,thus threatening the safety of running trains.To improve the seismic performance of HSRTBS and reduce damage to the system,a replaceable X-shaped Energy Dissipating Steel Damper(X-EDSD)is proposed,which contains the energy-dissipating component(EDC)to dissipate the earthquake energy.Cyclic tests were performed to obtain the hysteretic performance of the EDC and X-EDSD,and a test-validated numerical model was developed to conduct parametric analyses.The X-EDSD was simplified as a nonlinear spring element with hysteretic parameters and modeled into the numerical model of the HSRTBS for seismic dynamic analyses.The peak displacements of girder and rail decreased by approximately 48.1%and 47.7%,respectively.The peak deflections of the fasteners,cement asphalt mortar layer and sliding layer were reduced by 70.4%,70.8%,and 86.1%,respectively.A comprehensive consideration of the system response control-economic cost ratio coefficient R_(pe)is proposed,and the optimal thickness of 14.94 mm is obtained by applying cubic term coefficient fitting according to 5 groups of steel plate thickness data for the specific case study in this paper.The method can be used for cost-informed X-EDSD-selection for seismic mitigation of HSRTBS.
基金
supported by the National Key Research and Development Program of China(No.2022YFC3004304)
the National Natural Science Foundation of China(Grant No.52378209)
the Hunan Province Science and Technology Project Huxiang Young Talents Program(No.2023RC3057)
the Xiaohe SciTech Talents Special Funding under Hunan Provincial Sci-Tech Talents Sponsorship Program(No.2023TJ-X66).
