The durability and reliability of slab track structures are essential for the long-term safety and stable operation of high-speed railways. In order to provide a solid theoretical basis and technical reference for the advancement of high-speed railway quality, this paper comprehensively discusses design theories of slab track structures, service performance evolution and maintenance technologies, and reviews the innovation happening in the industry. On top of that, the damage evolution, fatigue features and durability of slab tracks, which are highly relevant to serviceability, are summarized, and the future research trend of slab track service behaviours is pointed out. In addition, this paper summarizes the rules of establishing standards for damage maintenance, typical solutions for repairing damage and methods of evaluating the maintenance outcomes that combine field tests and numerical simulations. It also envisions a future direction where advanced testing technologies would assist the evaluation of maintenance effects.

Tsunami has caused substantial damage to coastal bridges, which has seriously affected the transportation and rescue work in coastal communities and led serious threats to human life and property. Many studies have been conducted to investigate the tsunami-bridge-interaction in the last decade, especially since the 2011 Great East Japan earthquake and tsunami. To gain a better understanding of the bridge damage mechanism in tsunamis and corresponding protection measures, this paper presents a state-of-the-art review for the bridge-tsunami-interaction. In this paper, effective methods for the tsunami wave generation are documented and the characteristics of these methods are comparatively summarized. The influencing factors of tsunami parameters and bridge structural parameters are analyzed and the multi-hazard coupling effects on bridges are elaborated. Meanwhile, tsunami resistance measures for coastal bridges are archived. This review work aims to offer comprehensive overview and guidelines for the design and protection of coastal bridges that are vulnerable to tsunamis.

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