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先张法预应力空心板火损评定方法及处治对策

Keywords: 桥梁工程,先张法预应力空心板,评定方法,火损,温度场,处治对策

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Abstract:

火灾对先张法预应力空心板的安全性、耐久性存在非常不利的影响,详细阐述了火灾事故的处置思路和具体方法。研究提出综合采用颜色判别法、损伤程度判别法以及空心板内部温度场有限元分析法,以便更准确地判别火灾后结构的内部损伤。研究结果表明,火灾高温灼烧后混凝土强度严重下降,结构工作性能降低甚至丧失。通过对火损后结构表观状况和各类重要指标劣化的检测、火灾时结构表面温度推算、结构内部温度场模拟分析,研究得出判别内部损伤深度情况的方法,对损伤程度不同的板梁分别提出了保留利用、加固或拆除等相应处置措施。

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