火灾环境下钢-混凝土组合梁力学性能试验研究

发布时间：2018-10-30 11:36

【摘要】：该文为研究组合梁桥在火灾环境下的基本力学性能与特征,制作具有代表性的3根缩尺梁模型:简支T形梁、简支箱形梁及连续箱形梁,利用火灾试验炉进行局部三面受火试验,并给出详细的试验方法。在试验过程中,分别观察组合梁常温下及火灾高温后的结构行为,量测火灾高温下组合梁的温度场,分析了结构的变形特点。通过对试验数据的深入分析与研究,可以发现火灾下钢-混凝土组合梁中钢梁为主要升温构件,且升温速度快,温度分布不均匀;混凝土顶板具有一定的吸热作用,但不应忽略其对钢梁升温及温度分布的影响;从实测变形看,钢-混凝土组合连续梁体系的抗火性能要优于简支梁体系。研究成果可以为组合梁桥防火灾设计与分析提供试验依据与理论参考。
[Abstract]:In order to study the basic mechanical properties and characteristics of composite beam bridges under fire conditions, this paper makes three typical models: simply supported T-beam, simply supported box beam and continuous box beam. The local fire test on three sides is carried out by using fire test furnace, and the detailed test method is given. In the course of test, the structural behavior of composite beam at room temperature and after fire was observed, and the temperature field of composite beam under fire high temperature was measured, and the deformation characteristics of composite beam were analyzed. Through the deep analysis and research of the test data, it can be found that the steel beam in the steel-concrete composite beam is the main heating member under fire, and the heating rate is fast and the temperature distribution is not uniform. Concrete roof has some endothermic effect, but it should not ignore its influence on temperature distribution and temperature distribution of steel beam. From the measured deformation, the fire resistance of steel-concrete composite continuous beam system is better than that of simply supported beam system. The research results can provide experimental basis and theoretical reference for fire prevention design and analysis of composite girder bridges.
【作者单位】：东南大学交通学院桥梁工程系;
【基金】：交通运输部西部建设科技项目(2011318812970)
【分类号】：TU398.9;TU352.5

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