Avoid and sharp hard sharp material to avoid the corrosion of high heat and chemical reagents, so as not to rub the hair or damage.
避免和尖硬锐利的物质擦碰，避免受高压高热及化学试剂的腐蚀，以免擦毛或损伤。
Abstract: During the service life of a bridge, it is impossible to avoid damage accumulation and function degeneration due to traffic load, environmental corrosion and accidental punch.
摘要桥梁结构在其服役过程中，由于荷载作用和各种环境不利因素的影响，结构不可避免的会产生累积损伤和功能退化，如不及时采取措施，甚至会导致突发事故。
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