后张梁锚固损失计算方法的改进

Improvement of the Calculation Method of Anchorage Loss of Post-tensioned Beam

文章通过与已有文献锚固损失试验值和现行桥梁规范计算结果进行对比,得出结论:锚固损失理论值与试验值吻合较好,相对误差最大为5.09%.与锚固损失理论值相比,铁路桥规计算结果相对误差最大为-5.11%,公路桥规计算结果相对误差最大为-108.42%,混凝土结构设计规范计算结果相对误差为92.43%,公路桥规和混凝土结构设计规范计算结果出现失真现象;与反摩阻影响长度理论值相比,铁路桥规和公路桥规计算结果相对误差保持在7%左右,混凝土结构设计规范计算结果相对误差可达68.60%.针对公路桥规锚固损失计算结果的不合理性,建议在公路桥涵混凝土结构设计中锚固损失采用铁路桥规计算公式.

By comparing with the existing literature anchorage loss test value and the current bridge code calculation results,the results show that the theoretical value of anchor loss in this paper is in good agreement with the experimental value,and the maximum relative error is 5.09%.Compared with the theoretical value of anchorage loss,the maximum relative error of railway bridge gauge calculation results is-5.11%,the maximum relative error of highway bridge gauge calculation results is-108.42%,and the relative error of concrete structure design code calculation results is 92.43%,the calculation results of highway bridge code and concrete structure design code are distorted.Compared with the theoretical value of anti-friction influence length,the relative error of the calculation results of railway bridge code and highway bridge code remains around 7%,and the relative error of the calculation result of concrete structure design code can reach 68.60%.In view of the unreasonableness of the calculation results of anchorage loss for highway bridge code,it is recommended to use the railway bridge gauge calculation formula for anchorage loss in the design of concrete structure of highway bridge culvert.