Reinforcement and effect evaluation of a middle school in Japan

Abstract

In recent years, large earthquakes have occurred around the world frequently. In Japan, one of the world’s most earthquake-prone countries, it is more important to ensure the seismic performance of buildings. School buildings are the refuge after the disaster, so it has an important meaning to improve the safety and seismic performance of existing school buildings. Most of the school buildings in Japan were built before the implementation of a new seismic standard. Reinforcement is the most important method to ensure safety and improve seismic performance. Based on the reinforcement and reconstruction project of a middle school in Japan, this study introduces the reinforcement design method based on the overall reinforcement concept. Because of the lack of effective methods for evaluating the effect of reinforcement, a micro-tremor observation experiment was carried out by using the wireless acceleration sensor vibration system before and after the seismic reinforcement of the school building. The effects can be evaluated by comparing and analyzing the changes in the acceleration response spectrum, natural period, vibration mode and other characteristics before and after reinforcement. Based on the overall reinforcement concept, it is more reasonable to fit the structural characteristics of the building. The application of a wireless vibration measurement system for evaluating the effect of reinforcement is feasible, it can provide scientific reference for reinforcement design and construction.