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碳纤维布应力松弛试验研究
李世宏
摘 要

(江苏省建筑科学研究院结构所,南京 210008)
[摘要]制作碳纤维布试件,并对试件进行了为期7d的应力松弛试验,试验结果表明:碳纤维布存在应力松弛现象;随时间增长,松弛应力增加,总的趋势是初期发展快,后期发展慢;张拉初始应力越高,松弛应力越大,但碳纤维布最终留存的应力仍较大;初始应力持荷时间对试验结果影响较大,持荷一定时间后,碳纤维布应力松弛率明显降低。试验结果对分析、计算碳纤维布的预应力损失有一定的指导意义。
[关键词]碳纤维布;应力松弛;试验研究;预应力损失
Experimental study on relaxation of CFS
Li Shihong(Jiangsu Research Institute of Building Science,Nanjing 210008,China)
Abstract:The CFS specimens are made and stress relaxation test of CFS specimens has been prolonged for seven days, the following results are obtained. Firstly, there is stress relaxation with CFS. Secondly, the relaxation stress increases along with the time, and such increase is usually fast at the beginning and slow at later period. Thirdly, the higher the initial tension stress is, the greater the relaxation stress becomes, but the remained stress is still great. Lastly, the constant load time of the initial stress has great influence on results of the test, if maintaining the load for certain time, the stress relaxation of CFS will decrease obviously. The above results of the test will have guiding significance for the analysis and calculation of CFS prestress loss.
Keywords:CFS; stress relaxation; experimental study; prestressing loss
作者简介:李世宏,博士研究生,高工,Email:lshxoxo@126.com。
参考文献
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