Anchorage System in Old Post-Tensioned Precast Bridges

Bujňáková, Petra

doi:10.2478/cee-2020-0038

Abstract

The first precast post-tensioned bridges in Slovakia are approaching 60 years of their service life. Facing an aging infrastructure, it is necessary to assess their present structural condition and residual life expectancy. Different types and methods of anchorage system were developed and available for first post-tensioned bridges around the world. The reliability and functionality of anchorages contribute to the proper behaviour of post-tensioning system. The considerable effect of aggressive environment (frost, chloride salts, humidity) and environmental load (CO₂) leads to corrosion of anchorages and prestressing steel with the risk of a sudden unexpected damage to bridge. The research work deals into finding more details of this structural part. During the demolition of damaged post-tensioned bridges built in 1960s several anchorages were removed and analysed. The material properties, size parameters and performed tensile tests of a wedge anchorage system are summarised in this paper. The findings from this study can be used as input parameters for numerical simulation and durability assessment of similar aged existing post-tensioned bridges.

References

[1] Guidance for design of bridges. Regulation for railway and road bridges. SNM, Praha, 1951.
Search in Google Scholar Back to article
[2] LEONHARDT, F.: Prestressed Concrete Design and Construction. Wilhelm Ernest and Sohn, Berlin, 1964.
Search in Google Scholar Back to article
[3] ABELES, P. W. - BARDHAN-ROY, B. K.: Prestressed concrete designer's handbook. 3rd edition, Taylor and Francis Group, 1981.
Search in Google Scholar Back to article
[4] VOVES, B.: Technology of prestressed concrete. SNTL, Praha, 1976.
Search in Google Scholar Back to article
[5] MORAVCIK, M. - BUJNAKOVA, P. – BAHLEDA, F: Failure and damage of a first-generation precast prestressed bridge in Slovakia. Structural Concrete, 2020, pp. 1–10.10.1002/suco.201900526
Search in Google Scholar Back to article
[6] KOTEŠ, P. - BRODŇAN, M. - BAHLEDA, F.: Diagnostics of Corrosion on a Real Bridge Structure. Advances in Materials Science and Engineering, Vol. 2016, 10 pages, https://doi.org/10.1155/2016/2125604.10.1155/2016/2125604
Search in Google Scholar Back to article
[7] PAULÍK, P. et al.: Experimental evaluation of properties of 120 years old concretes at two concrete bridges in Slovakia. International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 249, 2016, pp. 227-234.10.4028/www.scientific.net/SSP.249.227
Search in Google Scholar Back to article
[8] VIČAN, J. et al..: Existing steel bridges evaluation. Civil and Environmental Engineering, 2016, Vol. 12 (2), pp. 103-110, https://doi.org/10.1515/cee-2016-0014.10.1515/cee-2016-0014
Search in Google Scholar Back to article
[9] KORTIŠ, J. et al.: Operational modal analysis of the cable stayed footbridge. Civil and Environmental Engineering, 2017, Vol. 13 (2), pp. 92-98, https://doi.org/10.1515/cee-2017-0012.10.1515/cee-2017-0012
Search in Google Scholar Back to article
[10] BAGGE, N.: Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges. Structural Concrete, 2019, pp. 1–24, https://doi.org/10.1002/suco.201900265.10.1002/suco.201900265
Search in Google Scholar Back to article
[11] GREGOROVÁ, V. - ŠTEFUNKOVÁ, Z. - LEDEREROVÁ, M.: Experimental investigation of the influence of the plasticizing agent on the properties of cement mortars. IOP Conference Series: Materials Science and Engineering, June, 549, 2019, DOI: 10.1088/1757-899X/549/1/012017.
Open DOI Search in Google Scholar Back to article
[12] KOMÁRKOVÁ, T. - LÁNIK, J. - ONDŘEJ, A.: Quality Control of the Anchoring of Steel Bridge Barriers by Non-Destructive Testing. Safety, Vol. 6, (2), 2020, https://doi.org/10.3390/safety6010002.10.3390/safety6010002
Search in Google Scholar Back to article
[13] LACO, J. - BORZOVIC, V.: Experimental Investigation of Prestressing Strand Bond on Behavior of Concrete Members. Structural Concrete, Vol. 114 (1), 2017, pp. 15-24, https://doi.org/10.1002/suco.201900526.10.1002/suco.201900526
Search in Google Scholar Back to article
[14] ZHOU, L. et al.: Experimental investigation of simply-supported post-tensioned beam after anchorage system failure. Engineering Structures, Vol. 212, 2020, pp. 1-9.10.1016/j.engstruct.2020.110507
Search in Google Scholar Back to article
[15] ČSN 742870: Steel anchorages of tendons in post-tensioned concrete structures. ÚNM, Praha, 1973.
Search in Google Scholar Back to article
[16] EN 1992-1-1: Design of concrete structures- Part 1-1. General rules and rules for buildings. European Committee for Standardization, Brussels, 2004.
Search in Google Scholar Back to article
[17] NESLUŠAN, M. et al: Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique. Materials, Vol. 12, (20), 2019, p. 3450, https://doi.org/10.3390/ma12203450.10.3390/ma12203450
Search in Google Scholar Back to article
[18] NESLUŠAN, M. et al.: Non-destructive monitoring of corrosion extent in steel rope wires via Barkhausen noise emission. J. of Magnetism and Magnetic Material. Vol. 484, 2019, pp. 179–187, https://doi.org/10.1016/j.jmmm.2019.04.017.10.1016/j.jmmm.2019.04.017
Search in Google Scholar Back to article
[19] ETAG 013: Guideline for European technical Approval of post-tensioning kits for prestressing of structures. EOTA, Brussels, 2002.
Search in Google Scholar Back to article

Anchorage System in Old Post-Tensioned Precast Bridges

Abstract

Paradigm

My account