An Analytical Method of Deflection Behavior Concerning Three-dimensional Steel Frame Exposed to Fire which takes Account of the Thermal Expansion of a Floor Slab
An Analytical Method of Deflection Behavior Concerning Three-dimensional Steel Frame Exposed to Fire which takes Account of the Thermal Expansion of a Floor Slab
复制标题
考虑楼板热膨胀的三维钢框架受火挠度行为分析方法
DOI：
10.3210/fst.24.211
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
T. Wakamatsu
中科院分区：
文献类型：
--
作者：
Yuguang Li;Hui Lin;T. Hirashima;Hideki Uesigi;T. Wakamatsu
当考虑建筑物在火灾中的行为时，将其视为3D物体是很自然的，因为火灾是涉及3D热膨胀的现象。火灾时防火分区内楼板对建筑结构的影响可能非常大，因此有必要探讨楼板对结构的影响。在这项研究中，端部约束力和相邻子结构的位移通过将结构划分为单一的子结构来制定，作为一种方法来解决在考虑板的三维分析中出现的节点数增加的问题。由于没有基本数据可用于暴露于高温下的2D应力下的混凝土，楼板的热膨胀被认为是由交叉梁的网格板。提出了一种考虑构件截面主轴运动影响的三维坐标转换方法。在此基础上，建立了考虑楼板热膨胀的三维钢框架火灾下挠度分析方法。理论计算结果与汽车火灾下全尺寸车架的试验结果吻合较好。
It is natural to treat a building structure as a 3D body when concerning its behavior in a fire, because fire is a phenomenon involving 3D thermal expansion. The influence that the floor slab in a fire compartment exposed to fire has on the behavior of the building structure during a fire may be extremely large, therefore, it is necessary to explore how the floor slab affects the structure when exposed to fire. In this study, the end restraint force and the displacements of the adjacent substructures are formulated by dividing structures into unitary substructures, as an approach to the problem of the increase in the number of nodes which occurs in the 3D analysis taking account of the slab. Since no basic data is available for concrete under 2D stress exposed to elevated temperatures, the thermal expansion of a floor slab is considered by conceiving the slab as a grid of intersecting beams. A method of 3D coordinate transformation, which takes the effect caused by the principal axis of component section moving from time to time into account, is proposed. Under these assumptions, an analytical method of deflection behavior concerning 3D steel frame exposed to fire that takes account of the thermal expansion of a floor slab is constructed. The theoretical results agree well with those recorded in experiments in which a full-scale frame was exposed to vehicle fire.