基于动态模量衰减的加固PPC梁疲劳寿命预测
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摘要
通过对6根部分预应力(PPC)梁的静载试验以及等幅疲劳试验,研究了碳纤维增强复合材料(CFRP)布和预应力钢绞线加固的PPC梁由于疲劳累积损伤而造成的弹性模量衰减规律。试验结果表明,通过静载试验试验梁挠度和裂缝以及疲劳试验试验梁挠度进行对比,得出加固PPC梁的承载力、疲劳寿命和整体刚度均有大幅度提高。最后通过疲劳试验结果建立了疲劳寿命与动态模量之间关系的数学模型,并对PPC梁加固的可靠性评估以及疲劳寿命预测提供了有效的方法。
Through the static load test and the amplitude fatigue test of 6 partially prestressed concrete(PPC) beams,the decrease rule of dynamic modulus caused by the fatigue cumulative of beams strengthened with carbon fiber reinforced polymer(CFRP) sheets and prestressed steel is studied.The test results show that the deflection and the crack of the static load test and the deflection of the amplitude fatigue are compared.It is concluded that the strengthened PPC beams increase greatly with the bearing capacity,the fatigue life and overall stiffness.Finally,the mathematical model of the relationship between fatigue life and dynamic modulus is set up through the fatigue test results,and an effective method to evaluate the reliability of PPC beam reinforcement and fatigue life prediction is provided.
Through the static load test and the amplitude fatigue test of 6 partially prestressed concrete(PPC) beams,the decrease rule of dynamic modulus caused by the fatigue cumulative of beams strengthened with carbon fiber reinforced polymer(CFRP) sheets and prestressed steel is studied.The test results show that the deflection and the crack of the static load test and the deflection of the amplitude fatigue are compared.It is concluded that the strengthened PPC beams increase greatly with the bearing capacity,the fatigue life and overall stiffness.Finally,the mathematical model of the relationship between fatigue life and dynamic modulus is set up through the fatigue test results,and an effective method to evaluate the reliability of PPC beam reinforcement and fatigue life prediction is provided.
引文
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[8] 杨万忠.利用剩余刚度理论对在役公路桥梁积累损伤的研究[D].济南:山东大学,2005. Yang Wanzhong.Study on accumulation damage of existing highway bridge by using residual stiffness theory [D].Jinan:Shandong University,2005.(in Chinese)
[9] 李士彬.由刚度衰减规律预测混凝土梁疲劳寿命的试验研究[J].建筑结构.2006,36(2):51-54. Li Shibin.Experimental study on fatigue life forecasting of RC beams using stiffness deterioration parameters[J].Building Structure,2006,36(2):51-54.(in Chinese)
[10] 李开兵.碳纤维布加固混凝土梁疲劳性能的试验研究[D].武汉:武汉理工大学,2003. Li Kaibing.Study on fatigue performance of reinforced concrete beams strengthened with CFRP-sheet [D].Wuhan:Wuhan University of Technology,2003.(in Chinese)
[11] 吕雁.玻璃纤维混凝土弯曲疲劳性能及累积损伤研究[D].昆明:昆明理工大学,2012. Lü Yan.Study on the flexural fatigue performance and cumulative damage of glass fiber reinforced concrete[D].Kunming :Kunming University of Technology,2012.(in Chinese)
[2] 庄江波,叶列平,鲍轶洲,等.CFRP布加固混凝土梁的裂缝分析与计算[J].东南大学学报(自然科学版),2006,36(1):86-91. Zhuang Jiangbo,Ye Lieping,Bao Yizhou et al.Fracture analysis and calculation of reinforced concrete beams with CFRP sheets[J].Journal of Southeast University (Natural Soience),2006,36(1):86-91.(in Chinese)
[3] 季园园,韩庆华,芦燕,等.CFRP 在土木工程中的应用研究[J].结构工程师,2014(5):210-219. Ji Yuanyuan,Han Qinghua,Lu Yan,et al.Applicationresearch of CFRP in civil engineering[J].Structural Engineers,2014,30(5):210-219.( in Chinese)
[4] 祝明桥,方志.混凝土箱梁体外预应力筋应力增量的全过程试验研究[J].桥梁建设,2003(6):8-10. Zhu Mingqiao,Fang zhi.Study on the whole process of stress increment of concrete box girder in external prestressed tendons[J].Bridge Construction,2003(6):8-10.(in Chinese)
[5] Yang K H,Byun H Y,Ashour AF.Shear strengthening of continuous reinforced concrete T-beams using wire rope units[J].Engineering Structres,2009(31):1154-1160.
[6] 王英,郑文忠,卫纪德,等.预应力钢绞线(束)粘结锚固性能初探[J].工业建筑,1994,03:19-22. Wang Ying,Zheng Wenzhong,Wei Jide,et al.The prestressed steel strand (bundle) is a preliminary investigation of the anchorage properties[J].Industrial Construction 1994,03:19-22.(in Chinese)
[7] 中华人民共和国住房和城乡建设部.GB 50367—2013 混凝土结构加固设计规范[S].北京:中国建筑工业出版社,2010. Ministry of Housing and Urban-Rural Development of thePeople’s Republic of China.GB 50367—2013 Code for design strengthening of concrete structures [S].Beijing:China Architecture & Building Press,2010.( in Chinese)
[8] 杨万忠.利用剩余刚度理论对在役公路桥梁积累损伤的研究[D].济南:山东大学,2005. Yang Wanzhong.Study on accumulation damage of existing highway bridge by using residual stiffness theory [D].Jinan:Shandong University,2005.(in Chinese)
[9] 李士彬.由刚度衰减规律预测混凝土梁疲劳寿命的试验研究[J].建筑结构.2006,36(2):51-54. Li Shibin.Experimental study on fatigue life forecasting of RC beams using stiffness deterioration parameters[J].Building Structure,2006,36(2):51-54.(in Chinese)
[10] 李开兵.碳纤维布加固混凝土梁疲劳性能的试验研究[D].武汉:武汉理工大学,2003. Li Kaibing.Study on fatigue performance of reinforced concrete beams strengthened with CFRP-sheet [D].Wuhan:Wuhan University of Technology,2003.(in Chinese)
[11] 吕雁.玻璃纤维混凝土弯曲疲劳性能及累积损伤研究[D].昆明:昆明理工大学,2012. Lü Yan.Study on the flexural fatigue performance and cumulative damage of glass fiber reinforced concrete[D].Kunming :Kunming University of Technology,2012.(in Chinese)