Study on Joining and Anchoring Mechanism of Various PC Tendons by Using Highly Expansive Material

高膨胀材料各种PC筋连接锚固机理研究

• 批准号: 10650452
• 负责人: HARADA Tetsuo
• 金额: $ 2.18万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650452/
• 关键词: Highly expansive material; FRP tendon; PC tendon; Anchoring method; Joining method; Prestressed concrete; FEM; 膨張材; PC緊張材; 連続線維緊張材; 定着システム; 膨張圧

Joining and anchoring mechanism of ordinary PC tendons as well as FRP tendons by using Highly Expansive Material( HEM) were investigated experimentally and analytically. CFRP strand (φ12.5), PC steel strand (φ12.7) and PC steel bar (φ13) were examined as PC tendons. Main results of this research are summarized below.l. From the pull-out tests, it was found that the sleeve length of 30 cm and the amount of the expansive pressure more than 50 Mpa is satisfactory to hold firmly various PC tendons and HEM anchorage is also useful for practical applications.2. The mechanism which the softening zone of HEM in layer progresses gradually from loaded end to the free end according to the increment of the load, is almost the same regardless of the kinds of PC tendons.3. HEM thin layer considered as shear transfer layer is modified as shear spring. The characteristics of the shear spring depends on the amount of expansive pressure and the bond characteristics between PC tendons and HEM.4. The analytical results calculated by the FEM model, in which the shear spring considered the softening is used, were simulated well with the experimental results.5. From the long-term tensioning tests, the loss of prestressing is negligibly small in practice because the loss of prestressing becomes within 1.5% when the length of CFRP tendon is 10 m.

对普通PC筋和高膨胀材料FRP筋的连接锚固机理进行了试验研究和理论分析。采用CFRP钢绞线（φ12.5）、PC钢绞线（φ12.7）和PC钢筋（φ13）作为预应力筋。本研究的主要结果总结如下。拉拔试验表明，套管长度为30 cm，膨胀压力大于50 Mpa的HEM锚具能够满足各种预应力筋的锚固要求，具有较好的实用价值.层内高强混凝土的软化区随荷载的增加从加载端逐渐向自由端扩展的机理，与预应力筋的种类基本相同.将HEM薄层视为剪切传递层，修正为剪切弹簧.剪切弹簧的特性取决于膨胀压力的大小和PC筋与HEM之间的粘结特性。采用剪切弹簧考虑软化的有限元模型计算的分析结果与试验结果吻合较好.从长期张拉试验来看，预应力损失在实践中可以忽略不计，因为当CFRP筋长度为10 m时，预应力损失在1.5%以内。

项目成果

Shuji FUKUDA et al.: "A Study on Anchoring and Joining of PC Tendon Using Highly Expansive Material"Proceedings of the Japan Concrete Institute. 21, No.3 (in Japanese). 379-384 (1999)

Shuji FUKUDA 等人：“使用高膨胀材料的 PC 筋的锚固和连接研究”日本混凝土协会会议录。

原田哲夫: "定着用膨張材による連続繊維緊張材の定着法に関する研究"土木学会論文集. No.627/V-44. 77-90 (1999)

Tetsuo Harada：“使用膨胀材料进行固定的连续纤维张力材料的固定方法的研究”日本土木工程学会第 627/V-44 号（1999 年）。

福田修一: "定着用膨張材によるPC緊張材の定着と継手に関する研究"コンクリート工学年次論文報告集. Vol.21,No.3. 379-384 (1999)

Shuichi Fukuda：“使用膨胀材料进行固定的 PC 筋的固定和接头研究”混凝土工程年论文集，第 21 卷，第 379-384 期（1999 年）。

T. Harada: "Long-Term Behavior of Anchorage for Carbon fiber reinforced Polymer Strands Using Highly Expansive material"Forth International Symposium/ Fiber Reinforced Polymer Reinforcement for Reinforced Concrete Structures, ACI. SP-188. 843-853 (1999)

T. Harada：“使用高膨胀材料的碳纤维增强聚合物束锚固的长期行为”第四届国际研讨会/钢筋混凝土结构纤维增强聚合物增强，ACI。

Tetsuo HARADA et al.: "A Study on Anchorage Method for Continuous Fiber Reinforcing Materials (FRP) Using Highly Expansive Material"Journal of Materials, Concrete Structures and Pavement, Japan Society of Civil Engineers. No.627/V-44(in Japanese). 77-90 (

Tetsuo HARADA 等：“使用高膨胀材料的连续纤维增强材料（FRP）锚固方法的研究”日本土木工程学会材料、混凝土结构和路面杂志。