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对一个多层组合结构在火势竖向蔓延3层时的结构性能进行了分析。前期工作主要分析了这个结构在遭遇3层楼面同时发生火灾时的性能,强调了楼房中采用的冷却系统和钢梁的相对轴向刚度对于结构整体性能的重要性。对更多现实场景进行了模拟分析,比如竖直蔓延的火势下结构的性能。也考虑了各种层间延时和楼面梁的尺寸,结果发现层间延时会极大地影响结构的整体性能,同时梁的刚度也会影响结构整体性能。单层楼面中蔓延的火灾引起的轴向力会导致柱子遭受往复加载,这一般在结构防火设计中是没有考虑的,但是可能会对结构性能影响很大。由于结构各异,不可能界定竖向蔓延火灾中结构损伤最严重的程度,所以推荐设计师多考虑几种火灾蔓延的方式,并针对各种情况进行设计以保证结构的整体性能。
The structural performance of a multi-layer composite structure with vertical spread of fire is analyzed. The previous work mainly analyzed the performance of this structure when it encountered a 3-floor fire and emphasized the importance of the relative axial stiffness of the cooling system and steel girder used in the building to the overall structural performance. Simulations of more realistic scenes, such as the behavior of structures under vertical spread fire. Various layer delays and the size of the floor beams were also considered. The results showed that the layer delay greatly affected the overall performance of the structure, and the stiffness of the beam also affected the overall performance of the structure. Axial forces caused by a sprawling fire in a single floor can cause the column to be subjected to reciprocating loading, which is generally not considered in structural fire protection design, but may have a significant impact on structural performance. Due to the different structures, it is impossible to define the most serious structural damage in a vertical spreading fire. Therefore, it is recommended that designers consider several ways of spreading fire and design for various situations to ensure the overall performance of the structure.