摘要
在采用后张法建立预应力体系的预应力混凝土结构中,由于预应力损失各因素的影响,其索力当前值是未知的.为对其实际值进行精确度量,以便把握结构当前预应力储备状况等级,将自主研发的"预应力钢索张力测试仪"应用于大比例模型试验梁试验检测.综合考虑模拟边界修正条件并结合二级差测定法的误差修正技术,建立了基于静力学原理获得束筋索力的静力参数静载检测法.通过试验分析得出:索力测试值与真值的相对误差不超过6%,并且随着张力等级的增大而呈现减小的趋势.因此,该方法精度满足要求并易于工程中推广应用.
Considering the influence of prestress losses on effective cable tension of prestressed strand among post-prestressed structures, the current value is still unknown. For the sake of measuring it exactly to estimate the condition for prestressing reservation, a speeial instrument Stretching Force Tester was invented and applied to measure the effective prestressing force of strand in a large-scale PC beam model. Thus the static parameter loading method was obtained by means of amending analogous boundary condition and minimizing test errors through the tool of double-stage differences. The results showed that the relative error for cable tension force between test value and standard one was less than 6 percent and it decreased with the growth of tensional grades simultaneously. Therefore, the precision of this method meets the project requirements and is easy to apply.
出处
《西安建筑科技大学学报(自然科学版)》
CSCD
北大核心
2009年第5期677-682,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家西部交通建设科技项目(200531881215)
陕西省重点学科建设专项资金项目
关键词
预应力混凝土
预应力筋
静力参数静载法
索力
张力测试仪
prestress concrete
prestressed tendon
static parameter loading method
cable tension
Stretching force tester