With the improvement of loading grade and extension of service year , the structural disease in bridge increases continuously . as a result , the loading capacity of bridge degrades gradually and the function of service deteriorates year by year 随着交通荷载等级的不断提高，桥梁服役年限的不断延长，桥梁结构的病害不断增多，桥梁结构的承载力不断降低，使用性能逐年恶化。
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