Test Error Sensitivity for Methods of Testing Prestressed Friction Loss
Publication: Journal of Bridge Engineering
Volume 23, Issue 2
Abstract
Although numerous studies have been conducted on prestressed duct friction loss test methods, only a few have considered the error sensitivities of the test methods used. For this paper, to conduct a prestressed duct friction loss test, the test error sensitivity coefficients of strain distribution and tension force ratio methods were derived. The effects of prestressed tendon parameters on the error sensitivity coefficient were studied and validated through a statistical analysis involving large amounts of in situ test data. The results indicated that the tension force ratio method was sensitive to test error, especially when the difference in tendon angle was less than 3° and the length was less than 15 m. The test error sensitivity coefficient of k was greater than that of μ under the same conditions. To compensate for the shortcomings of the strain distribution and tension force ratio methods, the P-Δ method was proposed and a solution for the P-Δ method was derived. A comparative analysis indicated that the error sensitivity of the P-Δ method used to calculate the curvature friction coefficient μ was significantly less than that of the tension force ratio method, while test error amplification also occurred when the P-Δ method was used to calculate the wobble friction coefficient k.
Get full access to this article
View all available purchase options and get full access to this article.
References
ACI (American Concrete Institute). (2014). “Building code requirements for structural concrete and commentary.” ACI 318m-11,Farmington Hills, MI.
Ayoub, A. (2011). “Nonlinear finite-element analysis of posttensioned concrete bridge girders.” J. Bridge Eng., 479–489.
Bažant, Z. P., Yu, Q., and Li, G.-H. (2012a). “Excessive long-time deflections of prestressed box girders. I: Recorder-span bridge in Palau and other paradigms.” J. Struct. Eng., 676–686.
Bažant, Z. P., Yu, Q., and Li, G.-H. (2012b). “Excessive long-time deflections of prestressed box girders. II: Numerical analysis and lessons learned.” J. Struct. Eng., 687–696.
Bhargava, R., Pathak, K. K., and Akhtar, S. (2017). “Numerical and experimental investigations of two span prestressed concrete beams.” J. Struct. Eng. (India),43(6), 547–556.
Chen, X. B., Chen, L. H., and Dong, Y. N. (2003). “Calculation of prestress loss due to friction of prestressing tendon with a profile of spatial curves.” China Civ. Eng. J.,36(6), 26–30 (in Chinese).
Dasar, A., Irmawaty, R., Hamada, H., Sagawa, Y., and Yamamoto, D. (2016). “Prestress loss and bending capacity of pre-cracked 40 year-old PC beams exposed to marine environment.” 3rd International Conf. on Civil and Environmental Engineering for SustainabilityEDP Sciences,Melaka, Malaysia.
Jeon, S.-J., Park, S. Y., Kim, S.-H., Kim, S. T., and Park, Y. H. (2015). “Estimation of friction coefficient using smart strand.” Ind. J. Concr. Struct. Mater.,9(3), 369–379.
Jones, C. A., Dameron, R., and Sircar, M. (2015). “Improving the state of the art in FEM analysis of PCCVs with bonded and unbonded prestress tendons.” Nucl. Eng. Des.,295, 782–788.
Khan, A. A., Dindorkar, N., and Pathak, K. K. (2010). “Three dimensional finite element analysis of prestressed concrete slabs considering friction.” J. Struct. Eng. (Madras),37(2), 154–160.
Li, X. B., Hou, J. J., and Ma, L. (2011). “Friction loss test and control of prestressing tendon ducts of railway bridges.” Railway Stand. Des.,11, 42–48 (in Chinese).
Li, C., Zhang, K. Y., and Fan, Z. L. (2014). “Research on prestressed loss in curving hole of prestressed concrete structure caused by frictional resistance.” Appl. Mech. Mater.,587–589, 1668–1671.
Liu, H., Lu, Z., and Peng, Z. (2014). “Test research on prestressed beam of inorganic polymer concrete.” Mater. Struct.,48(6), 1919–1930.
Lundqvist, P., and Nilsson, L.-O. (2011). “Evaluation of prestress losses in nuclear reactor containments.” Nucl. Eng. Des.,241(1), 168–176.
Marti-Vargas, J. R., Garcia-Taengua, E., Caro, L. A., and Serna, P. (2014). “Measuring specific parameters in pretensioned concrete members using a single testing technique.” Meas.,49, 421–432.
Naito, C., Cetisli, F., and Tate, T. (2015). “A method for quality assurance of seven-wire strand bond in portland cement concrete.” PCI J.,60(4), 69–84.
NRA of PRC (Professional Standard of the People’s Republic of China). (2014). “Code for the design of high-speed railways.” TB 10621-2014,Beijing (in Chinese).
NRA of PRC (Profession Standard of the People’s Republic of China). (2005). “Code for design of reinforced and prestressed concrete structure of railway bridge and culvert.” TB 10002.3-2005,Beijing, (in Chinese).
Pan, Z., and You, F. (2015). “Quantitative design of backup prestressing tendons for long-span prestressed concrete box-girder bridges.” J. Bridge Eng., 04014066.
Shao, X., Pan, R., Zhao, H., and Shao, Z. (2014). “Prestress loss of a new vertical prestressing anchorage system on concrete box-girder webs.” J. Bridge Eng., 210–219.
Wu, X.-H., Otani, S., and Shiohara, H. (2001). “Tendon model for nonlinear analysis of prestressed concrete structures.” J. Struct. Eng., 398–405.
Zhang, W. X., Xie, Q. Y., Li, X. B., and Zhao, H. Q. (2015). “Analysis of error sensitivity of prestressed duct friction loss coefficients test of high-speed railway bridge.” China Railway Sci., 36, (6), 31–36 (in Chinese).
Information & Authors
Information
Published In
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Mar 28, 2017
Accepted: Sep 5, 2017
Published online: Dec 13, 2017
Published in print: Feb 1, 2018
Discussion open until: May 13, 2018
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.