大藤峡水利枢纽人字闸门背拉杆预应力优化分析

大藤峡水利枢纽船闸下闸首人字闸门是目前世界上规模最大的人字门，采用3层预应力背拉杆，结构与应力变形十分复杂。为了合理确定背拉杆预应力，在总结闸门扭转变形主要特点的基础上，提出将斜接柱下角点的侧向位移作为目标函数，建立预应力优化模型。通过计算并与其他优化模型对比，发现以该模型求解的侧向位移明显较小，表明以斜接柱下角点侧向位移作为目标函数的优化模型可以得到更为合理的背拉杆预应力。相关经验可供类似工程借鉴。

Optimization analysis on back-tie rods prestress of super-large miter gate

At present, the miter gate in lower head of Datengxia ship lock is the largest one in the world, which has three-layer prestressed back-tier rods, and the structure and stress deformation are very complicated. In order to reasonably determine the prestress of the back-tie rods, on the basis of summarizing the torsional deformation characteristics of the gate, the lateral displacement of the lower corner of the inclined joint column was proposed as the objective function to establish the prestress optimization model. By calculating and comparing with other optimization models, it was found that the lateral displacement solved by this model is obviously smaller, which indicated that the more reasonable prestress of back-tier rods can be obtained by the optimization model by taking the lateral displacement of the lower corner of inclined column as the objective function.