足尺钢框架中连续板格火灾实验研究

发布时间：2018-02-27 02:00

本文关键词： 连续板格炉温变形裂缝特征钢梁　出处：《工程力学》2015年01期 　论文类型：期刊论文

【摘要】：利用自制火灾试验炉及相关试验装置对足尺钢框架中6块(2?3)连续板格的受火行为进行了试验研究。简要介绍了整体结构模型、试验炉设计与试验方案情况,描述了相关试验现象及破坏特征,并对炉温、板格沿截面的温度梯度以及板格平面外与平面内位移、梁截面的温度梯度及竖向挠度等试验数据进行了分析。相关结论如下:升温阶段受火板格沿截面存在着显著的温度梯度并在降温阶段存在温度滞后现象;受火钢梁截面在升温阶段初期存在较大的温度梯度,在降温阶段趋于一致,并由于周边约束未发生断裂或局部屈曲,对比标准受火试验,抗火性能显著增强;不同位置的板格由于约束程度的差别,在火灾中的变形性能也不同;由于受火钢梁的反拱效应,受火板格的部分挠度曲线存在平稳段;对比相关文献结果,发现板格的裂缝特征与其受火强度和边界约束密切相关,与周围钢梁是否受火关系不大。
[Abstract]:Using self-made fire test furnace and related test equipment, 6 pieces of steel frame in full-scale steel frame were studied. 3) the fire behavior of continuous plate lattice is studied. The whole structure model, the design of test furnace and the test scheme are introduced briefly, the related test phenomena and failure characteristics are described, and the furnace temperature is also discussed. The temperature gradient of the plate lattice along the cross section and the displacement outside and within the plane of the plate lattice, The experimental data of the temperature gradient and vertical deflection of the beam section are analyzed. The conclusions are as follows: there is a significant temperature gradient along the section of the plate lattice in the heating stage and the phenomenon of temperature lag in the cooling stage; The section of the steel beam subjected to fire has a large temperature gradient at the initial stage of heating and tends to be consistent in the cooling stage, and the fire resistance can be significantly enhanced by comparing the standard fire test with the standard fire test because there is no fracture or local buckling in the peripheral restraint. Because of the difference of restraint degree, the deformation performance of the plate lattice in different position is different in fire, because of the reverse arch effect of the steel beam, the deflection curve of the plate lattice has a stationary section. It is found that the crack characteristics of the plate lattice are closely related to the fire intensity and boundary constraints, but not to the fire resistance of the surrounding steel beams.
【作者单位】：哈尔滨工业大学土木工程学院;华侨大学土木工程学院;中信建筑设计研究总院有限公司;中国建筑西北设计研究院有限公司;
【基金】：国家自然科学基金项目(51178143) 高等学校博士专项基金项目(20102302110043)
【分类号】：TU375.2

【参考文献】