随着时间的推移,所有新桥都会变成旧桥,在这个过程中,桥梁在长期的露天环境中经受车辆荷载,大气腐蚀,温度,湿度的各种作用,都会有一个逐渐老化损害的过程。目前我国经济的高速发展,对交通运输的压力日益增大,适应这一变化,高等级的公路建设迅速发展,同时,正在使用中的旧国道、省道很多处于超期服役的阶段,沿线的旧桥更是出现了设计荷载低,运营期久,病害和缺陷 As time goes on, all new bridges will become old ones. In this process, the bridge will undergo a gradual aging damage under long-term open-air environment under various loads such as vehicle load, atmospheric corrosion, temperature and humidity . At present, the rapid economic development in our country is under increasing pressure on transportation. In response to this change, the rapid development of high-grade highway construction is underway. At the same time, the old national highway in use and many provincial highways are in the phase of extended service. The bridge is the emergence of a design load is low, a long period of operation, disease and defects