【作者】 王兰彩；

【导师】 周先雁；

【作者基本信息】 中南林业科技大学 ， 结构工程， 2009， 硕士

【摘要】 高强度FRP复合材料具有强度高、重量轻、抗疲劳、耐腐蚀等优良特性,是用于制作预应力筋或拉索以及用于结构加固补强的理想材料。然而该材料抗剪性能较差,抗挤压刚度不足,使得高强度FRP复合材料预应力筋或拉索的锚固问题变得异常困难。国内外针对FRP筋开发的锚具,尽管种类很多,但都存在着这样或那样的问题,难于在实际工程中大量推广应用。在目前可供选择的粘结介质中,RPC作为综合性能优良的粘结介质可在粘结式锚具中对具有表面压纹的高强CFRP筋提供最有效的锚固。本文对粘结介质为活性粉末混凝土(RPC)的粘结式锚具以及改进后的新型夹片式锚具进行静载试验研究和疲劳试验研究。静载试验：对于粘结式锚具,本文研究了CFRP筋锚固长度对粘结式锚具的静力锚固性能影响,通过试验证明了高强度活性粉末混凝土(RPC)作为粘结介质的粘结式锚具锚固碳纤维(CFRP)筋的可行性；对于夹片式锚具,详细研究了锚具长度、倾角、预紧力及铝套管厚度等参数对CFRP筋锚固性能的影响,通过试验证明了该类锚具具有良好的静载锚固性能。疲劳试验：本文研究了CFRP筋锚固长度为200mmm的粘结式锚具组装件和锚杯长度为80mm的组装件经受200万次循环加载的疲劳性能,通过疲劳试验证明了夹片锚具具有良好的疲劳性能。本文最后对CFRP筋专用锚具的进一步开发和研究提出了展望和建议。更多还原

【Abstract】 FRP composite have many good properties, such as high strength, light weight, resistance to fatigue, corrosion protection, as so on. So FRP composite is the idea material that can be made cable and tension member and can be used to repair and retrofit of existing structure. However, the weakness of FRP composite in transverse direction and its sensitivity to notching make anchoring difficult. Various anchorages for FRP bar have been invented, but they have some weaknesses, so these anchorages haven’t popular in civil engineering applications.In the case of different bond media, RPC shows the best performance as a bond medium in the bond-type anchorage for the indented surface CFRP tendons. So RPC has been chose as bond medium for bond-type anchorage system. In this paper, a series of static tests and fatigue tests have been done about the developed wedge-type anchorage system and bond-type anchorage system with RPC as bond medium for solving present problems.Static tests:the influence of the grouted length of CFRP tendon to static anchor performance of bond-type anchorage system has been tested, it is proved that the bond-type anchorage system has good anchor performance; the influence of anchor length, inner angle of barrel, presetting load level and the thickness of aluminum sleeve to wedge-type anchorage system has been tested, it is proved that the wedge-type anchorage system has good anchor performance.Fatigue tests:a series of 2-million-times fatigue tests has been done for studying the fatigue performance of bond-type anchorage system with 200mm grouted length of CFRP tendon and wedge-type anchorage system with 80mm grouted length of CFRP tendon.And the results of tests prove that these two anchorages have good faigue performance.At last, this thesis give proposals about the further development and research.更多还原