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新余鋼結構耐火性能如何提高？

?由于鋼結構耐火性能差，在火災高溫作用下將很快失效倒塌，耐火極限僅15-，因此，對用于重要建筑物的鋼結構，需進行耐火保護.以提高其耐火性能。目前，世界各國對鋼結構采用多種方法進行保護這些方法從原理上來說可分為兩種：截流法和疏導法。

1、截流法

截流法的原理是截斷或阻滯火災產(chǎn)生的熱流量向構件的傳輸，從曲使構件在規(guī)定的時間內(nèi)溫升不超過其臨界溫度。其做法足在構件表面設置一層保護材料.火災產(chǎn)生的高溫首先傳給這些保護材料，再由保護材料傳給構件。

由于所選材料的導熱系數(shù)較小.而熱容又較大，所以能很好地阻滯熱流向構件的傳輸，從而起到保護作用。截流法又分為噴涂法、包封法、屏蔽法和水噴淋法。

噴涂法是用噴涂機具將防火涂料直接噴涂在構件表而，形成保護層；包封法是用耐火材料如防火板材、混凝土或磚、鋼絲網(wǎng)抹耐火砂漿等把構件包裹起來；

屏蔽法是把鋼構件包藏在耐火材料組成的墻體或吊頂內(nèi)，主要適用于屋蓋系統(tǒng)的保護；水噴淋法是在結構頂部設噴淋供水管網(wǎng)，火災時自動啟動（或手動）開始噴水，在構件表面形成一層連續(xù)流動的水膜，從而起到保護作用。

2、疏導法

疏導法與截流法不同。疏導法允許熱流量傳到構件上，然后設法把熱量導走或消耗掉，同樣可使構件溫度不至升高到臨界溫度，從而起到保護作用。

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