Analysis and experiment on mechanical performance of bond-type anchorage for CFRP tendons(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年03期
- Page:
- 64-71
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Analysis and experiment on mechanical performance of bond-type anchorage for CFRP tendons
- Author(s):
- MEI Kui-hua; ZOU Xiao-hong; SUN Sheng-jiang; SUN Ya-min; JIN Guo-qing
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Guangzhou Municipal Engineering Design & Research Institute, Guangzhou 510060, Guangdong, China
- Keywords:
- words: bridge engineering; CFRP tendon; experimental study; bond-type anchorage; anchorage performance; contact analysis; load-slip
- PACS:
- U448.27
- DOI:
- -
- Abstract:
- In order to study the mechanical characteristics of bond-type anchorage for carbon fiber reinforced polymer (CFRP) tendons, straight-tube-type, inner-cone-type and composite-type anchorage were designed. In addition, stress distribution characteristics of inner tendon and sleeve itself of three kinds of anchorages were analyzed by using finite element method. Then, stress variation rules and slip features of CFRP tendons in anchorage were tested by experimental methods. Also, three directional stress of anchorage sleeve itself was tested. The effect of anchorage form and anchorage length on anchorage performance and the anchoring mechanism were studied. The results show that peak stress at loading end can be kept inside of anchorage by setting anchorage plug. Load transfer mode of composite anchorage is the most reasonable. The notch effect of inner-cone-type anchorage can be prevented in composite-type anchorage. In the early stage of loading, peak value of bonding stress is close to the loading end. With the increase of load, only the residual bond strength gradually exists at the loading end. In the later stage of loading, peak value of loading stress is near the free end of anchorage. The relationship between stress and strain of CFRP tendon at free part shows typical linearity. The bond-slip relationship obviously shows nonlinearity. In the early stage of loading, slippages of CFRP tendons are small. With the increase of load, slippages of CFRP tendons increase quickly. When closed to damage, slippages increase significantly. With the increase of load, bond stress between tendon and colloid firstly increases to a peak, then chemical adhesive force gradually failures, only residual stress exists at last. Peak point of bond stress gradually transfers from loading end to free end, which reflect that the phenomenon that normal stress of sleeve is the largest near the free end. Stress distribution in sleeve of anchorage can indirectly reflect the change of stress and slip of CFRP tendons.
Last Update: 2017-06-06