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越来越多的住宅与工业建筑以冷弯型钢墙作为主要的承载结构部件。之前的研究主要调查覆以石膏板的非承重冷弯型钢墙的耐火性能。为了有效地提升冷弯型钢承重墙的耐火性能,对5个在两面使用3种不同面板(耐火石膏板、玻镁板、硅酸钙板)的等尺寸的双层冷弯型钢墙进行了详细的试验研究。结果表明:硅酸钙板具有高温下爆裂的明显缺陷,且在实际的火灾情况下可能产生更严重的安全问题。冷弯型钢墙覆以石膏板作为面层,同时在两面覆以玻镁板作为基层时,不同的载荷比会导致不同的失效模式,且在载荷比小于0.65时耐火时间则会超过90 min。分析结果也表明,玻镁板的耐火性能要优于耐火石膏板,因此推荐使用玻镁板来代替石膏板作为冷弯型钢结构的基层。
More and more residential and industrial buildings use cold-formed steel walls as the main load-bearing structural component. Previous studies have investigated the fire resistance of non-load-bearing cold-formed steel walls covered with gypsum board. In order to effectively enhance the fire resistance of cold-formed steel load-bearing walls, five double-wall cold-formed steel walls of equal size using three different panels (fireproof gypsum board, glass magnesium board and calcium silicate board) on both sides were detailed Experimental study. The results show that the calcium silicate board has the obvious drawback of burst at high temperatures and may pose more serious safety problems under actual fire conditions. Cold-formed steel wall covered with gypsum board as cover and different load ratio leads to different failure modes when both sides are covered with glass board, and the fire resistance time will exceed 90 min when the load ratio is less than 0.65. The analysis also shows that glass magnesium board fire resistance is better than fire-resistant gypsum board, it is recommended to use glass magnesium board instead of gypsum board as the base of cold-formed steel structure.