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EXPERIMENT AND ANALYSIS OF PLASTIC PERFORMANCE OF PARTIALLY PRESTRESSED CONCRETE CONTINUOUS BEAMS WITH CFRP TENDON
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摘要: 为解决CFRP筋张拉与锚固,探索一种CFRP筋的锚固方法,对9根无粘结CFRP筋部分预应力混凝土连续梁进行三分点的静载试验。试验证明这种锚固方法是可行的。基于试验数据,重点开展中支座负弯矩钢筋屈服后,这类梁的CFRP筋应力及塑性铰区域分布特征、内力重分布等方面的研究。在此基础上,提出无粘结CFRP筋部分预应力混凝土连续梁等效塑性铰长度的估算公式和弯矩调幅的计算公式。
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关键词:
- 无粘结预应力CFRP筋 /
- 连续梁 /
- 塑性铰 /
- 内力重分布
Abstract: Nine continuous concrete beams reinforced with unbonded CFRP tendon were fabricated. Static load tests were carried out for these beams. A new method for CFRP tendon was presented before test to explore the anchorage method of CFRP tendon,whose feasibility was verified through test. Based on test data,it was studied stress of CFRP tendon,distribution of zone of plastic hinge,redistribution of internal force and so on. Then the calculation formula of length of equivalent plastic hinge and that of moment modification were presented respectively. -
何政,孙颖.高应力重复加卸载下 GFRP 筋与混凝土的粘结性能[J].复合材料学报,2006,23(6):149-157. [2] 薛伟辰,康梁清.纤维塑料筋在混凝土结构中的应用[J].工业建筑,1999,29(2):19-21. [3] 顾履恭.混凝土结构用纤维增强聚合物在国外的开发和应用[J].建筑技术,2001,32(5):310-313. [4] 高丹盈.纤维聚合物筋混凝土粘结性能的基本问题[J].郑州理工大学学报,2002,23(1):1-5. [5] 高丹盈等.纤维增强塑料筋混凝土梁受弯性能的计算方法[J].郑州大学学报,2003,24(1):1-4. [6] Nanni. A. FRP Reinforcement for Concrete Structures[M].Elsevier Science Publishers,1994,16(1):65-66. [7] 张鹏. FRP 筋混凝土梁受力性能的试验研究及理论分析[D].南宁:广西大学,2006. [8] 孟履祥,纤维塑料筋部分预应力混凝土梁受弯性能研究[D].北京:中国建筑科学研究院,2005. [9] 张建伟,杜修力,邓宗才.预应力芳纶纤维布加固混凝土梁的受弯性能研究[J].建筑结构学报,2006,27(5):101－109. [10] Wight R G,Green M F,Erki M-A. Prestressed FRP Sheets for Post-Strengthening Rein forced Concrete Beams[J]. Journal of Composites for Construction,2001,5(4):214-220. [11] Meier U. Strengthening of Structures Using Carbon Fiber/Epoxy Composites[J]. Construction and Building Materials,1995,9(6):341-351. [12] 程东辉,郑文忠.无粘结部分预应力纤维聚合物筋混凝土梁试验[J].沈阳建筑大学学报,2008,24(4):537-542. -
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