锚固区布置对预应力T梁梁端局部应力影响研究

32.6m全预应力后张法分片式简支T梁因其制作方便、施工进度快等优点在铁路桥涵中广范围使用。某组梁在预应力张拉后即在其端部相同位置出现贯穿其端部截面的裂缝。端部是锚固区布置的集中区域,锚下混凝土处于空间三维应力状态,受力十分复杂。该文通过三维空间ANSYS有限元实体模型,发现该组T梁的设计存在局部拉应力过大的现象,这也是其端部断面开裂的主要原因。为了在以后的设计中避免该问题的出现,该文总结了锚固区布置对该梁梁端局部应力影响规律,提出了改锚固区布置的方法及减小该梁端部易出现裂缝部位应力的措施,结果表明该方法简单可靠,所得结论和建议可供同类结构设计参考使用。

Study of Influence of Anchorage Zone Arrangement on Partial Stress at End of Pre-stressed T-shaped Beam

32.6-m full pre-stressed post-tensioning method separated simple-supported T-shaped beam is widely used in the bridge culvert of railway because of its convenient fabrication and fast construction progress.The crack running through the section of the beam end appears at the same position of the beam end at once after a group beam is prestressed tensioned.The end part is the centralized area to arrange the anchorage zone.The concrete under the anchor is placed at the space three-dimensional stress status,and...