论文部分内容阅读
为了进一步了解混凝土楼板的耐火性能,进行足尺模型3层钢框架结构建筑连续混凝土楼板的耐火试验。此试验研究以比已有试验更真实的火灾条件为理论模型,在第2层设置一个特殊的、可加热4块楼板(2×2)的炉子,并在第3层设有钢梁。对试验结果进行详细的研究,考虑结构部件在加热和冷却阶段的炉子温度、温度分布、垂直和水平挠曲以及失效类型等因素。试验数据显示,除了相邻的结构部件提供的边界约束条件外,受热楼板数量和位置也对连续混凝土楼板的耐火性能有相当大的影响。此外,由于结构部件间的结构完整性和结构相互作用,钢梁也展示了其比标准耐火试验中的钢梁更好的耐火性能。与高强螺栓连接部件相反的是,火灾作用下,建筑的焊接螺栓连接件并不会导致钢梁发生局部屈曲。
In order to further understand the fire resistance of concrete slabs, a full-scale model 3-story steel frame construction of continuous concrete fire resistance test. This experimental study uses a more realistic fire condition than the previous test as a theoretical model, with a special furnace on the second level that can heat up to 4 slabs (2x2) and a steel beam on the third level. The results of the study were studied in detail, taking into account factors such as furnace temperature, temperature distribution, vertical and horizontal deflection, and failure types of the structural components during the heating and cooling phases. Experimental data show that, in addition to the boundary constraints provided by adjacent structural components, the number and location of heated floors also have a considerable impact on the fire resistance of continuous concrete slabs. In addition, steel beams show better fire resistance than steel beams in standard fire tests because of the structural integrity and structural interaction between the structural parts. In contrast to high-strength bolted components, the building’s welded bolting does not cause local buckling of the steel girder under fire.