Investigation on Seismic Performance Degradation of Hub Large-Span Roof Structures Considering Corrosion and Damage Accumulation

Hub transportation facilities are important lifeline projects in cities. Once they are damaged by earthquakes, their functional use will be lost, resulting in significant adverse social impacts. The roof structures of hub transportation facilities are usually made of large-span steel structures. During service, they bear long-term vibrations caused by multiple vibration sources such as high-speed trains and wind loads, resulting in cumulative damage. In addition, the roof structures located in coastal areas may be exposed to a corrosive environment, which can lead to the degradation of structural performance. Currently, the relevant structural design standards do not consider the factor of structural performance variation over time. To address the above problems, this paper adopts a time-dependent constitutive model of steel considering corrosion and cumulative damage to investigate the seismic performance degradation of typical hub transportation facility roof structures. The research results show that the maximum stress generated by train vibration is far below the fatigue limit strength of the steel, indicating that the large-span roof structures of hub transportation facilities will not accumulate damage due to train vibration. Under the rare earthquake with an intensity of 8, the probability of severe damage to the hub large-span roof structures that have been in service for 50 years and considering corrosion and cumulative damage is low, demonstrating that the hub large-span roof structures have good seismic performance.