Part Four. Smartphone applications for infrastructure monitoring. Structural health monitoring

Advances in sensors and information technologies have brought structural health monitoring (SHM) as a data-driven remedy for civil infrastructure safety. Smart and mobile sensor systems have taken SHM discipline to a new era in the past two decades. Smartphones, in parallel, have paved the milestones of innovative SHM applications empowered by smart, distributed, wireless, mobile, and participatory sensor networks. This chapter introduces the advent of smartphones as an SHM technology and describes crowd/citizen engagement into an SHM framework. In contrast with the traditional monitoring approaches, there is a lack of control in sensor operation in terms of time, location, duration, and coupling conditions. These discrepancies are formulated as citizen-induced uncertainties, and smartphone-centric multisensory solutions are proposed. Smartphone-based SHM can characterize cyberphysical civil infrastructure systems, e.g., updating numerical bridge models with crowdsourced modal identification results in an automated manner. The chapter concludes with the state-of-the-art vision for smartphone usage in SHM, near future trends, and finally long-term research directions.