Long-period design response spectrum study of ultra-long-span suspension bridges

ZHOU Mi; LI Zhi-xuan; FENG Peng-fei

doi:10.19818/j.cnki.1671-1637.2025.03.009

Volume 25 Issue 3

Jun. 2025

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ZHOU Mi, LI Zhi-xuan, FENG Peng-fei. Long-period design response spectrum study of ultra-long-span suspension bridges[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 144-159. doi: 10.19818/j.cnki.1671-1637.2025.03.009

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ZHOU Mi, LI Zhi-xuan, FENG Peng-fei. Long-period design response spectrum study of ultra-long-span suspension bridges[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 144-159. doi: 10.19818/j.cnki.1671-1637.2025.03.009

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Long-period design response spectrum study of ultra-long-span suspension bridges

doi: 10.19818/j.cnki.1671-1637.2025.03.009

Key Laboratory of Transport Industry of Bridge Detection and Reinforcement Technology, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Key R&D Program of China 2021YFB1600300

National Natural Science Foundation of China 51978062

Fundamental Research Funds for the Central Universities 300102212209

Received Date: 2023-12-04
Accepted Date: 2024-09-12
Rev Recd Date: 2024-07-18
Publish Date: 2025-06-28

Abstract

Abstract

To establish the long-period design response spectrum suitable for the seismic design of ultra-long-span suspension bridges, 17 574 measured ground motion records were collected from the strong earthquake databases of China, Japan, and the United States. By correcting, filtering, and analyzing the spectral characteristics of the collected records, a standard and method for defining the conventional ground motion and the long-period ground motion were proposed. Then, 1 084 long-period ground motions were selected by this method.A "four-segment" standardized response spectrum mathematical model was used to fit the average amplitude of the long-period ground motions. The model parameters were calibrated by a genetic algorithm, the long-period design response spectra for different engineering sites were established. An ultra-long-span suspension bridge with a main span of 2 300 m was taken as the support project, the rationality of the proposed spectrum was verified by analyzing the structural response caused by the safety evaluation response spectrum and the long-period design response spectrum.Analysis results show that the average period of the acceleration response spectrum in the range of 0.02-10.00 s is no less than 1.5 s, which can be used as an important criterion with the less-than-1Hz main frequency component of the Fourier spectrum to define the conventional ground motion and the long-period ground motion.Compared with the standard response spectrum, the proposed long-period design response spectra can take the effect of long-period ground motion into more comprehensive consideration. Under E1 earthquake action, the seismic response difference ratio at the key position of the bridge tower in the support project, caused by the long-period design response spectrum and the safety assessment response spectrum, is 1.4%-42.4% while the difference ratio is 0.3%-19.3% under E2 earthquake action. Additionally, under the long-period design response spectrum, the seismic responses of the bridge tower and the stiffened beam are greater than that corresponding to the safety assessment response spectrum. For an ultra-long-span suspension bridge, where key load-bearing components need to maintain elasticity under E2 earthquake action, the proposed long-period design response spectrum can rationally guide its seismic design.
- bridge engineering,
- ultra-long-span suspension bridge,
- response spectrum fitting,
- long-period ground motion,
- genetic algorithm,
- seismic response

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References(33)

References

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Long-period design response spectrum study of ultra-long-span suspension bridges

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