Seismic Monitoring of Cable-stayed Bridge Using Wireless Sensor Network

Abstract

This paper describes an ongoing research work on the seismic monitoring of cablestayed bridge using wireless sensor network. Newly developed wireless sensor network that is based on simultaneous high-speed flooding technique is found efficient in transmitting the packets at the same timing without causing synchronization to the carrier frequency or phase. The wireless network monitoring system was implemented on the Shin-Nakagawa Bridge, 530-m single-plane single-pylon steel-box girder cablestayed bridge in Ibaraki prefecture in Japan. The structure is seismically isolated with rubber bearings and damper at the main pylon and piers. A total of 27 sensor nodes were installed on the cable-stayed bridge and viaduct at several locations on the pier, main pylon, girder and on the ground. The monitoring system has been in place since the summer 2017 and successfully recorded structural responses from more than twelve small-to-moderate scale earthquakes. This paper explains the wireless sensor system, monitoring system and analysis of recorded earthquakes.