Abstract:The performance of structures built with conventional anti-seismic technology is not always satisfactory in earthquakes. Researchers have often adopted "seismic isolation technology" in place of conventional "anti-seismic technology". The structural health monitoring system (SHMS), as a structural "nervous system", has been widely used in large-span bridges, tunnels, and tall buildings in order to monitor structural response and provide reliable data for the assessment of structurally safe performance. To investigate the deterioration mechanism of base-isolated structure (BIS) and assess the degree of safe performance experienced in earthquakes, many SHMS have been designed and implemented to address various seismic structure research objectives.Based on the SHMS results of other structure types. Many significant research achievements for BIS have been achieved by numerous scholars. In this paper, based on the previous paper Design and Implementation of Health Monitoring System for Base-Isolated Structure (Ⅰ): System Design, we design and implement a super-long base-isolated SHMS. Here we study the design of an overall solution; the implementation of solutions for all subsystems and functions in super-long base-isolated SHMSs, including the types, locations, and performance of sensors; the hardware and software of data acquisition systems and transmission solutions; and the types and functions of databases. Our results show that the coordinated operation of the super-long BIS ran well and the performance satisfied the desired objectives. We analyzed the horizontal displacement and temperature data of the isolation bearings and the acceleration response of superstructure monitored during construction and operation. The results show that the concrete shrinkage of the superstructure and temperature had a significant impact on the horizontal displacement of the isolation bearings. The relation of the horizontal displacement of rubbers in the elastic stage with temperature changed slightly, but the displacement of the isolation bearings subjected to environmental excitation had a cumulative effect based on long-term monitoring data, which would change the structural dynamic characteristics. According to the assessment criteria in the system design paper, we evaluated the performance of the super-long BIS and determined that the structure performs well.
