Influence of velocity pulse effect on earthquake‑induced track irregularities of high‑speed railway track-bridge system under near‑fault ground motions

• Autorzy: Shaohui Liu , Lizhong Jiang , Wangbao Zhou , Jian Yu , Yulin Feng , Zhenbin Ren

Identyfikatory

DOI

10.1007/s43452-024-00892-y

• Języki publikacji: EN

Abstrakty

EN

The near-fault ground motion records show a noticeable velocity pulse effect, which poses a significant seismic threat to the high-speed railway track-bridge system. This study conducts the seismic response analysis of the track-bridge system under near-fault ground motions with forward directivity and fling-step effects. It quantifies the degree of damage of each track-bridge system’s key component using the component's stiffness degradation coefficient. In addition, this research investigates the influence of velocity pulse effects from near-fault ground motions on earthquake-induced residual geometric irregularities and earthquake-induced dynamic irregularities. It explores the post-earthquake running performance of high-speed trains based on the input of earthquake-induced irregularities, providing a theoretical basis for the seismic design method of the track-bridge system based on running safety. The research results indicated that the stiffness degradation of the track-bridge system under near-fault pulse-type ground motions is more severe compared to near-fault non-pulse ground motions and mid-far-field ground motions. The amplitudes of earthquake-induced residual geometric irregularity and earthquake-induced dynamic irregularity of rails under near-fault pulse-type ground motions are much greater than those under near-fault non-pulse and mid-far-field ground motions. The earthquake-induced alignment irregularity significantly impacts high-speed trains' derailment coefficient and transverse acceleration. Consequently, failing to account for the velocity pulse effect of near-fault ground motions can lead to an over-estimation of the post-earthquake running capacity of the track-bridge system. Seismic design considerations for high-speed railway bridges must prioritize the influence of velocity pulse-type ground motions.

Słowa kluczowe

EN

velocity pulse effect; stiffness degradation; earthquake induced irregularity; post earthquake running safety

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 2
• Strony: art. no. e70, 2024
• Opis fizyczny: Bibliogr. 39 poz., rys., tab., wykr.

Twórcy

autor

Shaohui Liu

• School of Civil Engineering, Central South University, Hunan Changsha 410075, China
• National Engineering Research Center of High-speed Railway Construction Technology, Changsha, Hunan, China
• Seismic Research Center for Engineering Structures, Central South University, Changsha, China

autor

Lizhong Jiang

• School of Civil Engineering, Central South University, Hunan Changsha 410075, China
• National Engineering Research Center of High-speed Railway Construction Technology, Changsha, Hunan, China
• Seismic Research Center for Engineering Structures, Central South University, Changsha, China

autor

Wangbao Zhou

• School of Civil Engineering, Central South University, Hunan Changsha 410075, China
• National Engineering Research Center of High-speed Railway Construction Technology, Changsha, Hunan, China
• Seismic Research Center for Engineering Structures, Central South University, Changsha, China

• https://orcid.org/0000-0003-3338-4971

autor

Jian Yu

• School of Civil Engineering, Central South University, Hunan Changsha 410075, China
• National Engineering Research Center of High-speed Railway Construction Technology, Changsha, Hunan, China
• Seismic Research Center for Engineering Structures, Central South University, Changsha, China

autor

Yulin Feng

• School of Civil Engineering, East China Jiaotong University, Nanchang 330000, Jiangxi, China

autor

Zhenbin Ren

• School of Civil Engineering, Central South University, Hunan Changsha 410075, China
• National Engineering Research Center of High-speed Railway Construction Technology, Changsha, Hunan, China
• Seismic Research Center for Engineering Structures, Central South University, Changsha, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).