VIBRATION MEASUREMENT OF SCALED BRIDGE STRUCTURE IN LABORATORY THROUGH INTERNET OF THINGS

Abstract

Bridges are lifeline structure and must remain functional even after disasters. Henceforth its heath monitoring and real time data is vital. Recent development of Internet of things (IOT) based SHM of structures have attracted many researchers to work in this direction. This paper is focused on attempting to get the real time data of ambient vibration of scaled model bridge structure connected through various sensors and circuits through IOT. IOT works in three steps, in first step data is collected from object or device, in second, data is send to the cloud and in third step the software process the data and send it to user. The information send to end-user via an alert to the user. This has advantage of securing serviceability and safety of bridge at the any desired place away from the bridge site itself. For this, the bridge at 150 ft. Kalawad road, Rajkot named as Chimanlal Sukla Bridge with 4 lane 1.3 km long with multiple spans of 25m prestressed concrete Box and I girder resting on 24 pillars is modeled with 1:100 horizontal and 1:10 vertical scale in laboratory. The model was fixed with sensors and IOT assembly at critical locations, found out by FEM based software. The bridge is given vibrations of varying frequency till its resonance. Further, the alarm is set to buzz at this resonant frequency which enables authority to take remedial actions like stopping traffic and advocating detailed physical inspection.