Analysis of seismic response of directivity pulse-like near-fault ground motion to bridge of high-speed railway

作者：Chen Ling Kun^*; Zhang Nan; Jiang Li Zhong; Chen Ge Wei

来源：Journal of Railway Engineering Society, 2013, 30(9): 40-46.

• Elastic-plastic analysis
• High-speed railway bridges
• Near fault ground motion
• Pulse-like
• Strong ground motion

Research purposes: Recently, the more attentions have been paid to the influence of the near-fault ground motion on the dynamic response to bridge, but there is a little concerns about the near-fault ground motion effect in the current railway codes. To investigate the influence of the seismic response of the near-fault ground motion on high-speed railway bridge, by using the Pacific Earthquake Engineering Research Center (PEER), the Next Generation Attenuation Relationships for Western US (NGA West) strong ground motion database, the ANSYS software, the ANSYS-APDL language and the moment-curvature program, the finite element model for the multi-span simply-supported bridge of the high-speed railway was built on consideration of the influence of the track irregularity to calculate the elastic-plastic seismic responses of bridge subjected to the near/far-fault ground motions. Research conclusions: (1) Compared with far-fault ground motion and non-pulse-like motion, the directivity pulse-like Near-fault ground motion had a big influence on the seismic responses on the short-period structure, increased the displacement response of inelastic bridge structures and it also increased the structural and nonstructural damage because the hysteretic properties of the near-fault directivity pulse-type earthquake was characterized by the central strengthened hysteretic cycles. (2) The big vertical acceleration of near-fault directivity pulse-like motion could notably change the axial load of the bridge piers, resulting in big increase of vertical deflection in the mid-span of girder, but the vertical earthquake force is specified as 65% of the lateral earthquake in the «Code for Seismic Design of Railway Engineering» (GB 50111-2006) and it causes the smaller vertical deflection in the girder. (3) The calculation results could provide the reference to the seismic design of high-speed railway bridge, and provide the technical support for the revisions of the design specifications and standards.

• 出版日期2013
• 单位北京交通大学