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在火灾下,材料力学性能的退化是导致钢结构承载力降低的主要因素.对高强结构钢S690进行稳态和瞬态火灾试验研究,并将S690的高温材性试验结果与欧洲、美国、澳大利亚、英国和中国钢结构设计规范进行对比,结果表明,依据各国现行钢结构设计规范进行高强钢S690钢结构的抗火设计是不安全的.另外,对试验得出的高温下高强钢S690的弹性模量、屈服强度和极限强度折减系数进行数值拟合,给出可准确表征S690高温下材料性能退化的预测公式,可用于指导含高强钢S690构件的钢结构抗火设计,并为相关规范的修订提供参考依据.
In fire, the degradation of mechanical properties of the material is the main factor leading to the decrease of the bearing capacity of the steel structure.The steady-state and transient fire test of the high-strength structural steel S690 is carried out, and the results of the high-temperature material test of S690 are compared with those of the test materials in Europe, the United States, Australia , UK and China, the results show that it is unsafe to design the fire-resistant design of high-strength steel S690 steel structure according to the current national code of steel structure design.In addition, the test results show that the high-strength high-strength steel S690’s elasticity Modulus, yield strength and ultimate strength reduction factor were numerically fitted to predict the performance of materials can be accurately characterization S690 high temperature degradation of the prediction formula can be used to guide the steel structure with high strength steel S690 components of the fire design, and for the relevant specifications The revision provides the reference basis.