火灾作用下钢筋混凝土托梁转换结构模型变形有限元分析

发布时间：2019-01-05 01:58

【摘要】：采用ABAQUS有限元分析软件,对一榀4层底部大空间钢筋混凝土梁托柱转换结构模型施加标准升温及竖向荷载的共同作用,进行了8种受火工况下转换结构模型的变形计算,分析了模型中托梁和相邻边柱的位移与标准升温时间的关系曲线。计算结果表明,在不同受火工况下,随着标准升温时间的增加,转换结构模型均产生了常温竖向荷载变形基础上的附加变形。转换结构模型底部托梁的挠度值在升温前期的60 min内增长较快,之后逐渐减缓。沿托梁跨度方向的挠度曲线形状受受火房间布置位置的影响,在非对称受火房间布置工况下,模型对称轴受火房间一侧的托梁挠度偏大。火灾作用下转换结构模型两侧边柱在受火楼层横梁位置处向外凸出的变形明显大于其他楼层。对于仅在模型对称轴的一侧布置受火房间的工况,两侧边柱的侧移从上到下发生着剧烈的变化,表现出在不对称受火房间布置情形下,转换结构中会产生剧烈的相互作用。
[Abstract]:By using ABAQUS finite element analysis software, the deformation calculation of the transfer structure model under 8 different fire conditions was carried out by applying the standard temperature rise and vertical load to a transfer structure model with a large space reinforced concrete beam at the bottom of four stories. The relationship between the displacement of bracket and adjacent side column and the standard heating time in the model is analyzed. The results show that with the increase of the standard heating time, the additional deformation is generated on the basis of normal temperature vertical load deformation under different fire conditions. The deflection of the beam at the bottom of the transfer structure model increases rapidly within 60 min of the initial temperature rise, and then slows down gradually. The shape of deflection curve along the direction of the beam span is affected by the location of the fire room. Under the condition of asymmetric fire room layout, the deflection of the beam on the side of the fire room of the model symmetry axis is larger. The deformation of the lateral columns on both sides of the transfer structure model is obviously larger than that of the other floors at the beam position of the floor under fire. When the fire room is arranged only on one side of the symmetry axis of the model, the lateral displacement of the two sides of the column changes dramatically from top to bottom, which shows that in the case of asymmetric fire room arrangement, the transition structure will produce violent interaction.
【作者单位】：山东建筑大学土木工程学院;东南大学土木工程学院;
【基金】：国家自然科学基金项目(51278289,51478254)
【分类号】：TU375.1;TU352.5

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