预应力筋补张拉过程分析与分批优化控制  

Analysis of Prestressing Tendon Complementary Tensioning Process and Batch Optimization Control

作　　者：吕鹏涛[1] LYU Pengtao(China Railway 20th Bureau Group Co.Ltd.,Xi′an Shaanxi 710000,China)

机构地区：[1]中铁二十局集团有限公司,陕西西安710000

出　　处：《铁道建筑技术》2024年第4期76-79,107,共5页Railway Construction Technology

基　　金：中铁二十局集团有限公司科技研发项目(YF2101QL04B)。

摘　　要：通过对分批补张拉钢筋预应力损失进行分析,推导首次张拉和补张拉后预应力损失计算公式。从力和变形两个角度,研究整束预应力筋张拉与分批预应力筋张拉质量控制要求,并对二者受力情况进行对比分析。研究结论:对于预应力束中各预应力筋,不管尺寸是否相同,分批张拉后整体或为欠张拉状态,或为超张拉状态,预应力筋分批张拉存在较大局限性。建立预应力筋分批补张拉过程数学模型,提出一种基于强化学习的补张拉优化控制理论,以实现通过较少次数的分批补张拉过程即可达到较为精确的补张拉效果。By analyzing the prestress loss in batch complementary tensioning of steel bars,the formula for calculating prestress loss in first tensioning and complementary tensioning is derived.The quality control requirements for tensioning the whole prestressing tendons and batch prestressing tendons are investigated from both force and deformation perspectives,and the stress conditions of the two are compared.It is concluded that for each prestressing tendon in the prestressing bundle,regardless of whether the sizes are the same or different,after batch tensioning,the whole actually either belongs to the under-tensioned state or the over-tensioned state,and there are large limitations in batch tensioning of prestressing tendons.The mathematical model of prestressing tendon batch complementary tensioning process is established,and a reinforcement learning based optimal control theory of complementary tensioning is proposed to achieve a more accurate complementary tensioning effect with less number of batch complementary tensioning processes.

关 键 词：预应力 补张拉 受力分析 数学模型 优化控制 

分 类 号：TU757.1[建筑科学—建筑技术科学]