空心板桥火灾后结构承载能力试验与安全性评估

Test of Structural Bearing Capacity and Estimation of Safety of Hollow Plant Bridge after Fire

该文针对某空心板桥火灾后的技术状况进行了现场检测与损伤评估,研究探讨了火灾对中小跨径空心板桥结构性能的影响。在现场检测桥跨结构火灾后技术状况的基础上,通过实桥静载试验,掌握了火灾后桥梁的实际结构受力状况及实际承载能力,对火灾后桥跨结构的安全性进行了评估。结果表明,火灾后部分板梁实际承载能力降低,已不具备承受预定设计荷载的强度。

Aiming at the technical status of a hollow plate bridge after fire, the article introduces the field inspection and damage estimation, and studies and discusses the influence of fire on the structure performance of small-span and middle-span hollow plate bridges. On the basis of the field inspection of technical status of the span structure after fire and through the static load test of bridge, the article masters the practical structure stress status and the practical bearing capacity of bridge after fire, and estimates the safety of span structure after fire. The result shows that the practical bearing capacity of the local plate beam is reduced after fire,and the beam has not the strength to bear the predetermined design load.