钢筋混凝土框架结构耐火性能及抗火设计方法

Fire performance and fire fesistance design of reinforced roncrete frame structures

在采用梁单元的基础上建立钢筋混凝土框架整体结构耐火性能计算模型。框架结构横向3跨、高度7层,两个方向的跨度为8.4 m,层高4.0 m。混凝土采用C30混凝土,钢筋采用HPB400级钢筋。对火灾下典型的多层多跨钢筋混凝土框架结构的变形特点、典型破坏形态、内力重分布规律以及耐火极限进行分析。分析表明,火灾下框架结构出现了整体破坏形态和局部破坏形态两种典型的破坏形态,框架柱破坏是框架整体破坏的主要原因。提出钢筋混凝土框架结构的实用抗火设计建议。

A fire resistance calculation model of reinforced concrete frame structures based on beam elements was proposed.The frame structure has 3 spans and 7 floors,the size of span is 8.4 m and the height of floor is 4.0 m.The concrete is C30 and the steel is HPB400.The deformation,failure form,redistribution of internal forces and the fire resistance duration of a typical multi-layer multi-span reinforced concrete frame structures were studied.The results showed that there are 2 typical failure modes,which are the overall failure and the local failure,when the reinforced concrete frame fails in fire,and the column collapse is the main cause of the overall failure.The practical design suggestions for the fire resistance design of the reinforced concrete frame structures were proposed.