摘要
针对赣江中下游地区拟建水利枢纽工程泄洪水闸预应力锚索加固结构设计方案,利用仿真平台开展了张拉施工预应力损失量参数下对比计算分析,获得了加固结构上拉、压应力最大均位于锚固洞,各方案中该部位拉应力与闸坎、锚块间的差幅分别为86.9%~3.4倍、28.8%~1.8倍。锚固洞最大拉应力与预应力损失量呈负相关变化,但降幅集中在损失量5%~20%,超过20%后拉应力降幅较低。闸坎与锚块在低于预应力损失量20%方案中拉应力分别稳定在1.02、0.65 MPa,而超过该方案后拉应力递增。关键部位最大压应力随预应力损失量均为先增后减变化,3个部位在损失量20%方案中为压应力最大,预压效果最好。综合应力变化特征与分布特征,预应力损失量20%方案下应力状态安全、合理,利于施工,属最优方案。本文可为水工结构设计方案参数优化分析提供一定参考。
Aiming at the optimization of the design plan of prestress anchor cable reinforcement structure for the flood release gate of the planned water conservancy project in the middle and lower reaches of the Ganjiang River,the simulation platform is used to carry out the comparative calculation and analysis under the parameters of the tensioned prestress construction loss. It is obtained that the maximum tensile stress and compressive stresses of the reinforced structure are located in the anchor hole,and the difference between the tensile stress and the brake and anchor block is 86.9%~3.4 times and 28.8%~1.8 times,respectively. The maximum tensile stress of the anchor hole and the loss of prestress are negatively correlated,but the decrease is concentrated in the range of 5%~20% of the loss. While exceeding 20%,the decrease of the tensile stress is relatively low. The tensile stresses of brake and anchor block are stable at 1.02 MPa and 0.65 MPa respectively when the prestress loss is less than 20%,while the tensile stresses increase when the prestress loss exceeds this scheme.The maximum compressive stress of the three parts is in the 20% loss scheme,and the precompression effect is the best.According to the characteristics of stress variation and distribution,the stress state of 20% prestress loss scheme is safe and reasonable,which is conducive to construction and is the optimal scheme. This paper can provide some reference for optimization analysis of hydraulic structure design scheme parameters.
作者
曾俊平
ZENG Jun-ping(Jiangxi Water Conservancy and Hydropower Construction Group Co.,Ltd.,Nanchang 340200,China)
出处
《海河水利》
2022年第1期111-114,126,共5页
Haihe Water Resources
关键词
张拉预应力
水闸
加固结构
应力
tensioned prestress
water gate
reinforced structure
stress
