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A platform for research: civil engineering, architecture and urbanism
Amplitude response spectrum of seismic-induced track irregularity considering damping ratio
https://orcid.org/0000-0003-3338-4971
Highlights This paper proposes a method for calculating design seismic-induced irregularity for random high-speed railway structures under arbitrarily seismic intensity and structural damping ratio, providing a basis for the determination of post-earthquake driving speed.
Abstract The determination of post-earthquake driving speed is one of the key issues for railway operation in seismic areas. Currently, research on design seismic irregularity is based on specific damping ratios, but the damping ratios of high-speed railway bridges are not constant. In this paper, the effects of damping ratios on seismic-induced irregularity and design seismic-induced irregularity were compared. The amplitude response spectrum of design seismic-induced irregularity considering the impact of damping ratios was established. The structural random adjustment coefficient of amplitude response spectrum was determined. The research results show that, when the characteristic period remained unchanged, the position of amplitude response spectrum rises with the increase of seismic intensity. When the seismic intensity remained unchanged, the position of amplitude response spectrum rises with the increase of characteristic period. High-speed trains should be appropriately decelerated when traveling from a hard site to a soft site with the same seismic intensity or traveling from a near field site to a far field site. With the increase in seismic intensity, the structural random adjustment coefficient drops obviously. As the characteristic period increases, the structural random adjustment coefficients show no noticeable change.
Amplitude response spectrum of seismic-induced track irregularity considering damping ratio
https://orcid.org/0000-0003-3338-4971
Highlights This paper proposes a method for calculating design seismic-induced irregularity for random high-speed railway structures under arbitrarily seismic intensity and structural damping ratio, providing a basis for the determination of post-earthquake driving speed.
Abstract The determination of post-earthquake driving speed is one of the key issues for railway operation in seismic areas. Currently, research on design seismic irregularity is based on specific damping ratios, but the damping ratios of high-speed railway bridges are not constant. In this paper, the effects of damping ratios on seismic-induced irregularity and design seismic-induced irregularity were compared. The amplitude response spectrum of design seismic-induced irregularity considering the impact of damping ratios was established. The structural random adjustment coefficient of amplitude response spectrum was determined. The research results show that, when the characteristic period remained unchanged, the position of amplitude response spectrum rises with the increase of seismic intensity. When the seismic intensity remained unchanged, the position of amplitude response spectrum rises with the increase of characteristic period. High-speed trains should be appropriately decelerated when traveling from a hard site to a soft site with the same seismic intensity or traveling from a near field site to a far field site. With the increase in seismic intensity, the structural random adjustment coefficient drops obviously. As the characteristic period increases, the structural random adjustment coefficients show no noticeable change.
Amplitude response spectrum of seismic-induced track irregularity considering damping ratio
https://orcid.org/0000-0003-3338-4971
Highlights This paper proposes a method for calculating design seismic-induced irregularity for random high-speed railway structures under arbitrarily seismic intensity and structural damping ratio, providing a basis for the determination of post-earthquake driving speed.
Abstract The determination of post-earthquake driving speed is one of the key issues for railway operation in seismic areas. Currently, research on design seismic irregularity is based on specific damping ratios, but the damping ratios of high-speed railway bridges are not constant. In this paper, the effects of damping ratios on seismic-induced irregularity and design seismic-induced irregularity were compared. The amplitude response spectrum of design seismic-induced irregularity considering the impact of damping ratios was established. The structural random adjustment coefficient of amplitude response spectrum was determined. The research results show that, when the characteristic period remained unchanged, the position of amplitude response spectrum rises with the increase of seismic intensity. When the seismic intensity remained unchanged, the position of amplitude response spectrum rises with the increase of characteristic period. High-speed trains should be appropriately decelerated when traveling from a hard site to a soft site with the same seismic intensity or traveling from a near field site to a far field site. With the increase in seismic intensity, the structural random adjustment coefficient drops obviously. As the characteristic period increases, the structural random adjustment coefficients show no noticeable change.
Amplitude response spectrum of seismic-induced track irregularity considering damping ratio
Yu, Jian (author) / Zhou, Wangbao (author) / Jiang, Lizhong (author) / Yan, Wen (author) / Luo, Qiangang (author) / Liang, Fu (author) / Liu, Xiang (author)
Engineering Structures ; 293
2023-07-27
Article (Journal)
Electronic Resource
English
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