论文部分内容阅读
以实际工程的轨道交通预应力混凝土梁为原型,以跨中截面应力等效与施工工艺相似为原则,共设计6根1∶5大尺度模型梁,对其施工过程中的徐变性能进行了试验研究,重点考察混凝土种类、预应力筋张拉方式和截面应力差等因素对轨道梁徐变变形的影响。基于大型商用软件SOFiSTiK和自行编制的步进法有限元程序对模型梁在施工阶段的徐变变形进行时随全过程分析,计算结果与试验值的误差在10%以内。在此基础上,提出了考虑混凝土种类、预应力筋张拉方式和跨中截面应力差等多因素影响的、轨道梁施工阶段徐变变形设计建议。本文研究成果可为轨道交通预应力混凝土梁的施工阶段徐变变形控制与计算提供依据和参考。
Based on the actual engineering of prestressed concrete beams with rail transit and the principle of equivalent stress-spanning and cross-section cross-section construction, a total of 6 1: 5 large-scale model beams were designed and their creep performances were evaluated Experimental study focuses on the influence of concrete types, prestressing tendon tensioning method and cross-sectional stress difference on the creep deformation of the track beam. Based on the large-scale commercial software SOFiSTiK and step-by-step finite element program compiled by ourselves, the creep deformation of the model beam during the construction phase is analyzed with the whole process. The error between the calculated result and the experimental value is less than 10%. On this basis, the design proposal of creep deformation during the construction of orbiting beam is put forward considering the influence of concrete types, the prestressing tendon tensioning method and the stress difference across the mid-section. The results of this paper can provide the basis and references for the control and calculation of creep deformation in the construction phase of prestressed concrete beams.