<正>利用测量模态参数建立结构柔度矩阵来确定结构损伤的具体位置，然后应用神经网络技术对损伤部位进行程度识别。通过对一个简支梁的仿真计算表明，柔度矩阵差值法能准确识别损伤位置，且只用差值中最具识别特征的4个值作为输入向量即能取得较好的程度识别精度要求。

The cable structure antiseptic systems in China are all under destructive situation at present. The destructive causes of the cable antiseptic system were analyzed for cable structures. The results showed that the lifespan of cable could be lengthen by choosing two-humped PE sheath as well as stuffing something inside the cable that had such effects as steam isolation anti-corrosion lubrication and friction-resistence. The cable antiseptic system of the Nanjing No.3 Yangtze River Bridge was developed and put to use. The system includes PE sheath, the filling materials in the cable, the antiseptic system on the assembled cable.