摘要:
介绍两块足尺大型四边固支钢筋混凝土双向板火灾试验的设计及其在异常狭小空间下的安装。首先,阐述材料选用、保护层厚度的确定、试件尺寸的确定,在不同荷载工况下板的截面内力计算与配筋,用ANSYS对四点支承带悬臂板的内力进行分析;其次,重点阐述大型试件在异常狭窄空间和桥式吊车吨位严重不足情况下的详细吊装过程;最后,介绍板四边固支条件的实现方法。结果表明:在设计试件时应考虑不同荷载工况;ANSYS计算结果显示,四点支承带悬臂板的内力主要集中在四个支点及其连线上;大型试件的设计应综合考虑场地空间和设备的吊装能力,在地面平面不足时可考虑先通过竖向的抬升,利用其抬升处高度较大的平面进行安装。
Abstract:
In the present study,the fire test design of two large full-scale two-way reinforced concrete slabs being fixed at four edges and their installation under extremely narrow space were investigated.Firstly,the choosing of materials,concrete cover thickness,specimen dimensions and the calculating of internal forces and reinforced details at every working conditions were discussed;the internal forces of four-point supported slab with cantilever edges were also analyzed by ANSYS.Secondly,the process of installing the large full-scale specimen under extremely narrow space and insufficient capacity of bridge crane were illustrated in detail.Finally,the methods of simulating the slab supported at four fixed edges were introduced.The results showed that all working conditions should be taken into account while in the specimen design.The analyses by ANSYS indicated that the internal forces of the slab supported at four points were mainly focused on the four points and the lines passed them.The site and the capacity of the hoisting equipments should be considered in the design of large specimens.When there is no sufficient horizontal space in ground,the specimen can be lifted up firstly,so there is sufficient horizontal space on the lifted-up plane for installation.
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