预应力连续梁桥火损后的应变监测及分析研究

以实际火损钢筋混凝土预应力连续铁路桥梁工程为依托背景,对该梁体发生火灾后45天内的应变进行了紧密监测。围绕其经火灾高温后的应变变化、力学性能变化等,对所测得的实际应变监测数据进行了详细分析,研究了该梁体火损后应变随时间的变化特性,得出了桥梁结构火损后应变随时间的变化规律以及力学性能的变化等结论。为后期进行桥梁检测评定与维修加固奠定了坚实的理论基础。

Strain monitoring and analysis of prestressed continuous beam bridge after fire damage

Based on the actual fire damage of reinforced concrete prestressed continuous railway bridge project, the strain of the beam within 45 days after fire was closely monitored. Based on the strain change and mechanical property change after high-temperature fire, the measured actual strain monitoring data are analyzed in detail. The characteristics of strain change with time after fire damage of the beam are studied, and the rules of strain change with time after fire damage of the bridge structure and the changes of mechanical properties are obtained. The results lay a solid theoretical foundation for bridge detection, assessment, maintenance and reinforcement in the later stage.