Static and Dynamic Load Test of Libeň Bridge Over Vltava River in Prague and Concept of Repair

Abstract

The Libeň bridge in Prague is a cultural and technical heritage of concrete construction of the beginning from the twentieth century. The bridge was designed by architect Pavel Janák, the founder of cubism in architecture. According to experts, the Libeň bridge is the only example of cubist morphology application on the bridge structure. Evaluation of Libeň bridge structural condition is an up-to-date topic leading to decision whether this bridge should be repaired or replaced by a new bridge. This article deals with the static and dynamic load testing in comparison with following creation and validation of the FEA model for load carrying capacity assessment of the Libeň Bridge and possible way of reconstruction. Paper deals with crucial procedures for FEA model validation of this backfilled arched concrete structure with a focus on the static characteristic of the structure. Article deals with reconstruction of the vault part of the Libeň Bridge using R-UHPFRC in terms of static operation. It focuses on the two basic problems of the bridge, the solution to increase the bearing capacity of the vault arches and to increase the bearing capacity of the foundations under pillars. The concept of repair is based on extensive diagnostic surveys conducted in 2017. The concept of structural enhancement is based on adding new thin layer of R-UHPFRC (reinforced, ultra-high performance concrete) on the upper vault surface. Concrete bridge structures are exposed to extreme effects of aggressive environmental influences, especially chlorides, which leads to damaging of most exposed bridge components a long time before their service life. UHPFRC material is suitable for repairs of these structures and especially due to its impermeability and high resistance.

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References

[1] Mourek, J., Tej, P., Kral, J., Kolisko, J. “Assessment of structural condition of steel bridge in Brandys nad Orlici.” MATEC Web of Conferences 107, doi:10.1051/matecconf/201710700003

[2] Tej, P., Kral, J., Tejova, A., Markova, J.. “Long-Term Monitoring of a Composite SteelConcrete Bridge on the Prague Ring Road.” Applied Mechanics and Materials, doi: 10.4028/www.scientific.net/AMM.617.13

[3] Čech, J., Tej, P., Kolísko, J., Král, J. 2017. “Structural condition assessment of the bridge in Ostrava.” MATEC Web of Conferences 107, doi: 10.1051/matecconf/201710700001

[4] Kněž, P., Čech, J., Tej, P., Blank, M. 2017. “Assessment of structural condition of Libeň Bridge.” MATEC Web of Conferences 107, doi: 10.1051/matecconf/201710700002

[5] Knez, P., Tej, P., Citek, D., Kolisko, J. 2017 “Design of footbridge with double curvature made of UHPC”, IOP Conference Series-Materials Science and Engineering 246, doi: 10.1088/1757-899X/246/1/012042

[6] Kolísko, J., Čítek, D., Tej, P., Rydval, M. 2017 “Production of footbridge with double curvature made of UHPC”, IOP Conference Series-Materials Science and Engineering 246, doi: 10.1088/1757-899X/246/1/012009

[7] Kolisko, J., Cech, J., Tej, P., Knez, P. 2017 “UHPC panels utilized as permanent formwork of in-situ cast reinforced concrete deck bridges.” IOP Conference Series-Materials Science and Engineering 246, doi: 10.1088/1757-899X/246/1/012043

[8] Tej, P., Kolisko, J., Knez, P., Cech, J. 2017. “The Overall Research Results of Prestressed I-beams Made of Ultra-high Performance Concrete.” IOP Conference Series-Materials Science and Engineering 246, doi: 10.1088/1757-899X/246/1/012051

[9] Tej, P., Kněž, P., Kolísko, J., Vráblík, L. 2017. “Modal analysis of cable-stayed UHPC bridge.” MATEC Web of Conferences 107, doi: 10.1051/matecconf/201710700007

[10] Blank, M., Tej, P., Kolísko, J., Vráblík, L. 2016. “Design of Experimental Suspended Footbridge with Deck Made of UHPC.” MATEC Web of Conferences 77, doi: 10.1051/matecconf/20167708005

[11] Pokorny, P., Tej, P., Kouřil, M. 2017. “Evaluation of the impact of corrosion of hot-dip galvanized reinforcement on bond strength with concrete - A review”, Construction and Building materials 132, p. 271-289.

[12] Pokorny, P., Tej, P., Szelag, P. 2016. “Chromate conversion coatings and their current application”, Metalurgija 55, p. 253-256.

[13] Pokorny, P., Tej, P., Szelag, P. 2016. “Discussion about magnesium phosphating”, Metalurgija 55, p. 507-510.

[14] Brozek, V, Kolisko, J. et all. 2015.“Boronized stainless steels with zirconia coatings”, Metal 2015:24th International Conference on Metallurgy and Materials, Tanger Ltd, p.1069-1074