- 摘 要
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（中國建筑標(biāo)準(zhǔn)設(shè)計研究院，北京 100044）
［提要］樓板的耐火極限由樓板產(chǎn)生不能承受規(guī)定荷載而破壞的極限時間和樓板面平均溫度上升到規(guī)定極限值的極限時間確定。美國規(guī)范規(guī)定了熱膨脹受約束和無約束兩種結(jié)構(gòu)體系的耐火極限。給出了美國規(guī)范中不同結(jié)構(gòu)體系和不同受約束條件下的板最小厚度和保護(hù)層厚度的要求。建議在吸收外國經(jīng)驗的基礎(chǔ)上，補(bǔ)充我國規(guī)范對防火設(shè)計的相關(guān)規(guī)定。
［關(guān)鍵詞］預(yù)應(yīng)力混凝土空心樓板；耐火試驗；耐火極限；約束條
件；最小厚度
Fire Resistance Design of Prestressed Hollow Floor System/Zhuang Guowei,Chen Youfan,Wu Yanyan(China Institute of Building Standard Design & Research,Bei
jing 100044,China)
Abstract:The fire endurance limit time of floor is determined according to the limit time that the floor can bear the specified load and damage and that the surface temperature reaches the specified value.The fire endurance limit times of restrained and nonrestrained hot expanding systems are set in America code.The restrain conditions of different structural systems are introduced,and the minimum thickness of the floor and cover layer is presented in the code.It is suggested that some regulations about the fire endurance design in Chinese code should be added based on abstracting the expereinces aboard.
Keywords:prestressed concrete; hollow floor; fire endurance test; limit time;restrain condition; minimum thickness
