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| Analysis of Seismic Response of Directivity Pulse-like Near-fault Ground Motion to Bridge of High-speed Railway |
| CHEN Ling-kun1, ZHANG Nan1, JIANG Li-zhong2, CHEN Ge-wei3 |
| 1.Beijing Jiaotong University, Beijing 100044, China; 2.Central South University, Changsha, Hunan 410075, China; 3.University of Auckland, Auckland 1142, New Zealand |
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Abstract 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.
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Received: 14 June 2013
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2013, Vol. 30 
