6.1.4. Damage of building fire to structures火对结构的损伤thedamageoffiretostructure口建筑火灾对结构构件的破坏Damageofbuildingfiretostructuralcomponents口常温下的适筋梁变为超筋梁；The under-reinforced beam at normal temperature will change toover-reinforcedbeam口连续梁抗火性能比简支梁好得多；Thecontinuous beam has much better fire resistance than the simplysupportedbeam口梁板构件的承载力明显降低，刚度虽然没有明显变化，但延性明显降低，发生脆性破坏；The bearing capacity of the beams and slabs is obviously reducedWhile the stiffness is not obviously changed, the ductility is greatlyreduced and the brittle failure occurs;楼板是火灾中最薄弱的环节Flooristheweakestpartinthefire
6.1.4. Damage of building fire to structures 火对结构的损伤 the damage of fire to structure 建筑火灾对结构构件的破坏 Damage of building fire to structural components 常温下的适筋梁变为超筋梁； The under-reinforced beam at normal temperature will change to over-reinforced beam 连续梁抗火性能比简支梁好得多； The continuous beam has much better fire resistance than the simply supported beam 梁板构件的承载力明显降低，刚度虽然没有明显变化，但延性明显 降低，发生脆性破坏； The bearing capacity of the beams and slabs is obviously reduced. While the stiffness is not obviously changed, the ductility is greatly reduced and the brittle failure occurs; 楼板是火灾中最薄弱的环节 Floor is the weakest part in the fire
6. 1. 4. Damage of building fire to structures耐火极限Fire-resistancelimit口建筑构件的耐火性能Fireresistanceofbuildingcomponents构件的燃烧性能和抵抗火焰燃烧的时间（耐火极限）Thecombustionperformanceandthedurationofresistancetoflame burning of components (the limit offire resistance)耐火极限：对任一建筑构件按照标准时间-温度曲线进行耐火试验，从受到火起作用时起，到失去稳定性或完整性被破坏或失去隔火作用时为止的时间Fire resistance limit: the duration from the time when the fire actson the building component to the time when it losses stability, integrityfire insulation, oris destroyed by the fire when a building component istested on a fireresistancetestunderthe standardtime-temperaturecurve
6.1.4. Damage of building fire to structures 耐火极限 Fire-resistance limit 建筑构件的耐火性能 Fire resistance of building components 构件的燃烧性能和抵抗火焰燃烧的时间（耐火极限） The combustion performance and the duration of resistance to flame burning of components (the limit of fire resistance) 耐火极限：对任一建筑构件按照标准时间-温度曲线进行耐火试验， 从 受到火起作用时起，到失去稳定性或完整性被破坏或失去隔火作用时为 止的时间 Fire resistance limit: the duration from the time when the fire acts on the building component to the time when it losses stability, integrity, fire insulation, or is destroyed by the fire when a building component is tested on a fire resistance test under the standard time-temperature curve
6. 1. 4. Damage of building fire to structures耐火极限Fireresistancelimit口耐火极限判定条件criterionoffireresistancelimit非承重结构：丧失完整性；失去绝热性Non-bearing structure: loss of integrity; loss of thermal insulation.承重结构：是否失去承载能力和抗变形能力Bearing structure:losethe bearing capacity orthe anti-deforming capacity墙：发生塌，失去承载能力Walls: Collapse ,or lost bearing capacity梁或板：珊，失去承载能力，最大挠度超过L/20cm，失去抗变形能力Beam or slab: collapse, loss of bearing capacity, the maximum deflectionexceeds L/20cmandthus lose or the anti-deforming capacity柱：塌，失去承载能力，轴向收缩变形速度超过3Hmm/min，失去抗变形能力，H为受火高度Column: collapse, loss of bearing capacity,axial shrinkage deformation rateexceeds 3Hmm/min and thus lose the ability to resist deformation, H for theheightofthefire
6.1.4. Damage of building fire to structures 耐火极限 Fire resistance limit 耐火极限判定条件 criterion of fire resistance limit 非承重结构：丧失完整性；失去绝热性 Non-bearing structure: loss of integrity; loss of thermal insulation. 承重结构： 是否失去承载能力和抗变形能力 Bearing structure: lose the bearing capacity or the anti-deforming capacity 墙：发生坍塌，失去承载能力 Walls: Collapse ,or lost bearing capacity 梁或板：坍塌，失去承载能力，最大挠度超过L/20cm，失去抗变形能力 Beam or slab: collapse, loss of bearing capacity, the maximum deflection exceeds L/20cm and thus lose or the anti-deforming capacity 柱：坍塌，失去承载能力，轴向收缩变形速度超过3Hmm/min，失去抗变形能力， H为受火高度 Column: collapse, loss of bearing capacity, axial shrinkage deformation rate exceeds 3Hmm/min and thus lose the ability to resist deformation, H for the height of the fire