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通过对我国建筑结构用钢在拉伸和压缩两种方式下的恒载升温试验,进行了5次受拉试件和2次受压试件的对比研究,根据试验中材料的各自变形规律,对其破坏机理进行了理论分析;从材料屈服的定义出发,给出了恒载升温拉伸试验中的参数(对应温度下的临界荷载水平),并与恒载升温压缩试验中的参数项进行了对比,指出受压构件和受拉构件的高温屈服强度是不同的,因此在钢结构建筑的耐火设计中应分别取不同的安全系数。
By comparing the tensile test and the compression test, the tensile tests and the compression test of the steel used in the construction of our country were carried out. The comparison study was conducted between the five tensioned specimens and the two pressed specimens. According to the deformation laws of the materials in the experiment, Based on the definition of material yielding, the parameters (corresponding to the critical load at the corresponding temperature) in the constant temperature tensile test were given and compared with the parameters in the constant temperature compression test In contrast, it is pointed out that the high-temperature yield strength of compression members and tension members are different, so different safety factors should be taken in the fire-resistant design of steel structures respectively.