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对部分外包梁的耐火性能进行研究。根据欧洲规范EN1363-1,通过12种试验评定不同荷载等级和剪切条件下箍筋和钢腹板的耐火性能。同时进行了3个试验来测试室温下的耐火性能。试验装置由一个小的电阻炉和门式框架组成。对试验样本、使用仪器和材料特性也进行了详细的介绍。对室温下荷载-变形和荷载-应变结果以及在ISO834标准下火灾场景中的挠曲变形和温度测量也进行了评定。结果显示耐火性能依赖于荷载等级。荷载等级增加37%将会导致耐火性能降低28%。进一步试验发现,最高的荷载等级将会导致更低的耐火性能,且与剪切条件无关。然而,焊接箍筋的试验则显示其有更高的临界时间。对主要的试验结果进行介绍和讨论。特别强调了各种材料在温度方面的改变和钢-混组合件的整体热-力学性能。
Research on the fire resistance of some of the outsourced beams. According to the European standard EN1363-1, 12 tests were used to evaluate the fire resistance of stirrups and steel webs under different load classes and shear conditions. Three tests were conducted at the same time to test the fire resistance at room temperature. The test setup consisted of a small resistance furnace and portal frame. Test samples, the use of equipment and material properties are also described in detail. Load-deformation and load-strain results at room temperature and flexural deformation and temperature measurements in the fire scene under ISO 834 were also evaluated. The results show that fire resistance depends on the load level. A 37% increase in load rating will result in a 28% reduction in fire resistance. Further tests found that the highest load rating would result in lower fire resistance and not shear conditions. However, the test of welding stirrups shows that it has a higher critical time. The main test results are introduced and discussed. Particular emphasis is placed on the temperature changes of various materials and the overall thermo-mechanical properties of the steel-plastic composite.