摘要
预应力损失的研究是预应力纤维增强材料(FRP)加固技术的关键之一,提出一种新型预应力张拉锚固一体式锚具,对其用于预应力加固损伤内压钢管过程中造成的摩擦损失、锚具损失、松弛损失的产生机理进行分析,通过弹塑性力学平面应力解法以及摩擦损失试验研究,建立摩擦损失后纤维布内力的分布模型;基于锚具损失试验与松弛损失试验的分析,得出前80 min存在锚具损失且锚具损失与螺栓的锁紧程度相关,并得到松弛损失随时间的变化规律以及松弛损失百分比。
Study of prestress loss is one of the key technologing in prestressed FRP reinforcement. This paper presented a new type of stretching and anchoring integral anchorage for prestressed FRP reinforced damage internal pressure steel pipe,analysed the generation mechanism of friction loss,anchorage loss,relaxation loss caused by the strengthening process. By elastic-plastic mechanical plane stress solution and friction loss test research,the stress distribution model of fiber sheet after the friction loss was established. Based on the analysis of relaxation loss test and anchorage loss test,it was found that the anchorage loss existed in the first 80 minutes of the process and that the anchorage loss was related to the locking degree of bolt. Besides the relaxation loss percentage and the change law of relaxation loss with the time were also got.
出处
《工业建筑》
CSCD
北大核心
2015年第6期22-26,共5页
Industrial Construction
基金
国家自然科学基金资助项目(51408513)
四川省科技计划资助项目(2014HH0062)
西南科技大学研究生创新基金项目(14ycx083)
