论文部分内容阅读
为检验钢筋混凝土双向固支板的3 h耐火极限,进行耐火试验研究,试验中采用了专门的限位装置来模拟板四边固支的约束条件。试验结果表明试验板受火3 h后未发生破坏。采用结构抗火分析软件SAFIR对耐火试验进行数值模拟,计算所得温度场和挠度曲线与试验测试值吻合程度较好。对试验板抗火性能的数值模拟及分析结果还表明:在塑性极限状态下,板产生了大变形,其承载机制由抗弯承载转变为与受拉薄膜力两者共同承载,受拉薄膜效应的有利作用能够使试验板的耐火极限得到较大提高,因此试验板的实际耐火极限超过3 h。建议设计单位可充分利用钢筋混凝土双向固支板自身的抗火能力来满足3 h耐火极限的消防要求。
In order to test the 3 h fire resistance limit of reinforced concrete bidirectional retaining plates, a fire test was conducted. In the experiment, a special limiting device was used to simulate the restraining conditions of solid support on the four sides of the plate. The test results show that the test board did not damage after 3 h of fire. The structural fire resistance analysis software SAFIR is used to simulate the fire resistance test. The calculated temperature field and deflection curve agree well with the test values. The numerical simulation of the fire resistance of the test plate and the analysis results also show that under the plastic limit state, the plate has a large deformation, and the bearing mechanism of the plate changes from the bending bearing to that of the tensioning film force. The tensioning film effect Of the beneficial effects of the test board fire resistance can be greatly improved, so the actual fire test board limit of more than 3 h. It is suggested that the design unit can make full use of the fireproof ability of reinforced concrete bidirectional fixing plate to meet the fire resistance requirement of 3 h fire resistance.