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为研究钢结构纤维防火涂料往复大变形和疲劳性能,分别对涂有防火涂料的试件进行了往复和疲劳试验。往复试验采用悬臂柱,疲劳试验采用两端简支梁进行实际受力的模拟。得到了涂料在往复荷载和疲劳荷载下的裂缝发展过程以及破坏模式,并对试验结果进行了分析。结果表明,在往复荷载试验中,试件接近屈服时,涂料开始出现肉眼可见裂缝。随后裂缝逐渐发展,在试件完全屈服且翼缘局部失稳的情况下,涂料出现宽度较大的裂缝,但是并未脱落。承受疲劳荷载作用时,涂料在100万次疲劳荷载作用后,开始出现细微裂缝,最终钢构件先于涂料破坏。通过试验分析,得到了裂缝发展的主要影响因素,检验了纤维防火涂料的往复大变形和疲劳性能。
In order to study the large deformation and fatigue properties of steel fiber reinforced fire retardant coatings, the specimens coated with fire retardant coatings were subjected to reciprocating and fatigue tests respectively. Reciprocating test using cantilever column, fatigue test using both ends of the simple beam simulation of the actual force. The crack development process and failure mode of the coating under reciprocating and fatigue loading were obtained, and the test results were analyzed. The results show that in the reciprocating load test, the specimen begins to appear visible cracks when the specimen approaches yielding. Then the cracks developed gradually. When the specimens were completely yielding and the local buckling of the flange was instable, the coating showed a wide crack but did not come off. To withstand the fatigue load, the coating began to appear fine cracks after 1 million fatigue loads, and finally the steel components were destroyed before the coating. Through experimental analysis, the main influencing factors of the crack development are obtained, and the large deformation and fatigue performance of the fiber fire retardant coatings are tested.