为了探明不同的分舱隔板设置方式与连接节点形式对管廊结构的影响,采用有限元方法建立管廊结构模型,分析在地层荷载、地面超载以及设备荷载作用下分舱隔板简支和刚接时的管片结构内力,并通过室内试验与数值计算讨论了3种连接方式下边梁中钢牛腿的力学性能及其对管片损伤的影响。结果表明:分舱隔板的施加将减小管片结构上半环的弯矩和轴力,同时增大下半环的弯矩与轴力,但隔板与边梁连接方式对管片结构力学特征的影响较小;边梁与管片采用钢牛腿+扩底锚栓的连接方式时管片表面开裂主要集中在最上排锚孔下侧,增加锚栓数量能有效控制管片开裂以及减小钢牛腿的最大位移,采用9根锚栓相较于6根锚栓牛腿最大位移最多减小了54.2%;在锚栓数量相同的情况下,增加锚栓列数能更好地减小管片内部混凝土损伤,以及控制牛腿变形。
In order to find out the influence of different setting modes of subdivision partitions and joint forms on pipe corridor structure, finite element method is used to establish pipe corridor structure model and analyze the internal forces of pipe segment structure with simple support and rigid connection of subdivision partitions under the action of stratum load, ground overload and equipment load. The mechanical properties of the steel corbel in the lower beam of the three connection modes and their effects on segment damage are discussed by laboratory tests and numerical calculations. The results show that: Application of a partition plate decreases the bending moment and axial force of the upper half ring and increases the bending moment and axial force of the lower half ring, but the connection mode of the partition plate and side beam has little effect on the mechanical characteristics of the segment structure. The surface cracking of the segment is mainly concentrated on the lower side of the top row of anchor holes. Increasing the number of anchor bolts can effectively control segment cracking and reduce the maximum displacement of the steel corbel. Compared with 6 anchor bolts, the maximum displacement of the steel leg with 9 anchor bolts is reduced by up to 54.2%. In the case of the same number of anchors, increasing the number of anchors can better reduce the concrete damage inside the segment and control the deformation of the steel corbel.
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