竖向预应力精轧螺纹钢筋锚具接触刚度识别及其张拉力测试原理
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摘要
基于预应力混凝土箱梁桥腹板竖向预应力精轧螺纹钢筋锚固螺母与锚垫板通过接触传递预应力,其法向接触刚度、锚固螺母段抗弯刚度与张拉力存在正比增加关系,建立竖向预应力筋外露段双参数变化的动力学模型,获得锚固螺母与锚垫板法向接触刚度与张拉力的关系式,室内模型试验和多座桥梁现场试验表明其法向接触刚度与张拉力关系具有稳定性。在此基础上提出现场标定法向接触刚度与张拉力关系的方法和现场测试竖向预应力精轧螺纹钢筋张拉力技术路线,并形成测试标准,可彻底解决竖向预应力精轧螺纹钢筋张拉力失效的问题。
Considering that the anchoring force is transferred through the contact between the prestressed anchor and prestressed anchor plate,and the normal contact stiffness and bending stiffness of nuts are in proportion to the anchoring force,a new dynamic model with two parameters is proposed for the exposed section of vertical finishing prestressed reinforced bars,and the relationship between the normal contact stiffness and the anchoring force is established. The test results of indoor model tests and field tests show that there is a stable linear relationship between the normal contact stiffness and the anchoring force. In additional,the standard method to obtain the relationship curve and the site operation to test the anchoring force on site are provided,which means the problem of tension failure of vertical finishing prestressed reinforced bars can be solved completely.
Considering that the anchoring force is transferred through the contact between the prestressed anchor and prestressed anchor plate,and the normal contact stiffness and bending stiffness of nuts are in proportion to the anchoring force,a new dynamic model with two parameters is proposed for the exposed section of vertical finishing prestressed reinforced bars,and the relationship between the normal contact stiffness and the anchoring force is established. The test results of indoor model tests and field tests show that there is a stable linear relationship between the normal contact stiffness and the anchoring force. In additional,the standard method to obtain the relationship curve and the site operation to test the anchoring force on site are provided,which means the problem of tension failure of vertical finishing prestressed reinforced bars can be solved completely.
引文
[1]钟新谷.预应力混凝土连续箱梁桥裂缝分析防治及钢箱-混凝土组合梁研究[D].长沙:湖南大学,2002
[2]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):31-37(Zhou Junsheng,Lou Zhuanghong.The status quo and developing trends of large-span prestressed concrete bridges with continuous rigid frame structure[J].China Journal of Highway and Transport,2000,13(1):31-37(in Chinese))
[3]方志,汪剑.预应力混凝土箱梁桥竖向预应力损失的实测与分析[J].土木工程学报,2006,39(5):78-84(Fang Zhi,Wang Jian.Vertical prestressing loss in the box girder of long-span PC continuous bridges[J].China Civil Engineering Journal,2006,39(5):78-84(in Chinese))
[4]刘一吾.大跨径PC连续刚构桥的合理构造与腹板裂缝机理研究[D].西安:长安大学,2012(Liu Yiwu.The reasonable structure of long-span PC continuous rigid frame and web crack research[D].Xi'an:Chang'an University,2012(in Chinese))
[5]王东东.预应力作用下混凝土箱梁桥空间应力分析[D].长沙:长沙理工大学,2013(Wang Dongdong.The study on spatial stress of concrete box girder bridge under the influence of pestress[D].Changsha:Changsha University of Science&Technology,2013(in Chinese))
[6]钟新谷,杨滔,沈明燕,等.混凝土箱梁桥腹板竖向预应力筋张拉力检测方法[J].中国公路学报,2010,23(4):63-69(Zhong Xingu,Yang Tao,Shen Mingyan,et al.Method for tension test of vertical prestressing bars in webs of concrete box girder bridges[J].China Journal of Highway and Transpor,2010,23(4):63-69(in Chinese))
[7]Majumdar A,Bhushan B.Fractal model of elastic-plastic contact between rough surfaces[J].Journal of TribologyTransactions of the ASME,1991,113(1):1-11
[8]张学良.机械结合面动态特性及应用[M].北京:中国科学技术出版社,2002
[9]Chen J H,Hsieh S C,Lee A C.The failure of threaded fasteners due to vibration[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2005,219(3):299-314
[10]霍学晋.异型拱桥的非线性受力行为研究及动力特性分析[D].成都:西南交通大学,2007(Huo Xuejin.Study on nonlinear mechanical behavior of special-shape arch bridge and analysis of its dynamic characteristics[D].Chengdu:Southwest Jiaotong University,2007(in Chinese))
[11]DB43/T 847—2013预应力混凝土箱梁桥腹板竖向预应力精轧螺纹钢筋张拉力检测规程[S].长沙,2014
[2]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):31-37(Zhou Junsheng,Lou Zhuanghong.The status quo and developing trends of large-span prestressed concrete bridges with continuous rigid frame structure[J].China Journal of Highway and Transport,2000,13(1):31-37(in Chinese))
[3]方志,汪剑.预应力混凝土箱梁桥竖向预应力损失的实测与分析[J].土木工程学报,2006,39(5):78-84(Fang Zhi,Wang Jian.Vertical prestressing loss in the box girder of long-span PC continuous bridges[J].China Civil Engineering Journal,2006,39(5):78-84(in Chinese))
[4]刘一吾.大跨径PC连续刚构桥的合理构造与腹板裂缝机理研究[D].西安:长安大学,2012(Liu Yiwu.The reasonable structure of long-span PC continuous rigid frame and web crack research[D].Xi'an:Chang'an University,2012(in Chinese))
[5]王东东.预应力作用下混凝土箱梁桥空间应力分析[D].长沙:长沙理工大学,2013(Wang Dongdong.The study on spatial stress of concrete box girder bridge under the influence of pestress[D].Changsha:Changsha University of Science&Technology,2013(in Chinese))
[6]钟新谷,杨滔,沈明燕,等.混凝土箱梁桥腹板竖向预应力筋张拉力检测方法[J].中国公路学报,2010,23(4):63-69(Zhong Xingu,Yang Tao,Shen Mingyan,et al.Method for tension test of vertical prestressing bars in webs of concrete box girder bridges[J].China Journal of Highway and Transpor,2010,23(4):63-69(in Chinese))
[7]Majumdar A,Bhushan B.Fractal model of elastic-plastic contact between rough surfaces[J].Journal of TribologyTransactions of the ASME,1991,113(1):1-11
[8]张学良.机械结合面动态特性及应用[M].北京:中国科学技术出版社,2002
[9]Chen J H,Hsieh S C,Lee A C.The failure of threaded fasteners due to vibration[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2005,219(3):299-314
[10]霍学晋.异型拱桥的非线性受力行为研究及动力特性分析[D].成都:西南交通大学,2007(Huo Xuejin.Study on nonlinear mechanical behavior of special-shape arch bridge and analysis of its dynamic characteristics[D].Chengdu:Southwest Jiaotong University,2007(in Chinese))
[11]DB43/T 847—2013预应力混凝土箱梁桥腹板竖向预应力精轧螺纹钢筋张拉力检测规程[S].长沙,2014