Seismic vulnerability of H-type ultra-high pier continuous rigid frame bridge considering effects of incident angle

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 230-242.

EARTHQUAKE SCIENCE AND STRUCTURE SEISMIC RESILIENCE

Seismic vulnerability of H-type ultra-high pier continuous rigid frame bridge considering effects of incident angle

CHEN Shitong1,2,3, FAN Xin1,2, GAN Pingping4, GUO Chaoqun2, XIANG Min*4

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Abstract

Compared with conventional bridges, H-type double-column super-high pier continuous rigid frame bridge has more complicated stress, significant influence of high-order vibration modes and great difference in longitudinal and transverse stiffness. The incident angle of ground motion is one of the key factors affecting its seismic response. In order to explore the influence of incident angle on its fragility, a simulation model is established to analyze the seismic response of a three-span super-high pier continuous rigid frame bridge of a high-speed railway in western mountainous areas. Based on the longitudinal and transverse bridge directions, the bi-directional Fragility analysis of components is carried out, and the contribution rate of super-high piers and bearings to the bridge system is considered. Based on the first-order reliability theory, the Fragility model of bridge composite system is constructed, and the fragility surface of bridge system is established, and the influence law of earthquake incidence angle on the seismic fragility of bridge system is discussed. The results show that the damage probability of the middle part of the ultra-high pier under longitudinal earthquake excitation is obviously higher than that of the middle and low piers, and the peak curvature of the transverse bridge is out of sync with the capacity demand ratio, so it is not reasonable to evaluate the seismic performance of the ultra-high pier only by judging the weak part of the peak curvature. The most unfavorable incident angles at the bottom of pier are 0~15 and 165~180, and the most unfavorable ones at the cross beam of pier body are 60~120, and the most
unfavorable ones at the top of pier vary under different earthquake intensities. The seismic fragility of bearing is sensitive to the change of earthquake intensity and incident angle, and it presents different damage trends under different working conditions, and it is more prone to damage than pier, so the mechanical properties of transverse stop should be paid attention to in design. The seismic fragility of bridge system shows a strong correlation with the incidence angle of ground motion, and the most unfavorable incidence angles are 75~105 and 255~285.

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bridge engineering / super-high pier rigid frame bridge / earthquake fragility / worst incidence angle / law of earthquake damage

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CHEN Shitong1, 2, 3, FAN Xin1, 2, GAN Pingping4, GUO Chaoqun2, XIANG Min4. Seismic vulnerability of H-type ultra-high pier continuous rigid frame bridge considering effects of incident angle[J]. Journal of Vibration and Shock, 2025, 44(5): 230-242

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