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中文摘要：
大跨度预应力混凝土箱形梁桥下挠现象的原因仍然没有完全明确。针对预应力混凝土箱形梁桥,指出了光纤传感技术在此类结构加固监测中所发挥的作用及优势。结合某座既有预应力混凝土箱形旧桥的加固监测实例,提出了此类桥梁结构加固监测中应包含的若干直接监测及间接监测指标,及围绕此类监测指标应构建的基于光纤传感技术的监测子系统。重点分析了体外索张拉,箱梁裂缝及张拉应力损失的部分测试数据。监测结果表明：以光纤传感技术为手段的加固监测系统弥补了传统加固监测方案的不足。
英文摘要：
The deflection reasons for long-span prestressed concrete box-girder （LSPCB） bridge are still ambiguous. This paper pointed out some outstanding advantages of using fiber optical sensing （FOS） technology in old LSPCB bridge strengthening monitoring. According to certain existing old LSPCB bridge strengthening monitoring example, it presented some direct and indirect monitoring indexes that should be contained in the old strengthening monitoring. The necessity of designing some monitoring sub system enclosing the mentioned indexes based on optical fiber sensing technology were also presented. The main analysis resuits about partial external tendons, cracks on girders and prestress loss show that the method based upon FOS technology is superior to the traditional means.
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