The uncorroded-part fallacy

Abstract

This paper deals with the collapse load of corroded parallel steel units, such as sets of corroded strands alone, or embedded in a concrete core. It is shown that what is relevant is the distribution of the damage between the units, and not the total area loss due to corrosion. The paper also shows that assuming that the area loss is related to the limit load loss is misleading, and potentially dangerous.

Keywords

Corrosion / Strands / Pitting / Preloaded concrete / Polcevera Viaduct / Collapse / Progressive rupture / Progressive collapse / Bridge retrofitting

References

[] Chi-Ho J, Jae-Bin L, Sokanya L, Chang-Su S. Equivalent Material Model of Corroded Prestressing Steel Strand. J Mater Res Technol, 2019, 8(2): 2450-2460,

[] Ebeling R. M. et al, 2016, Corrosion Induced Loss of Capacity of Post Tensioned Seven Wire Strand Cable Used in Multistrand Anchor Systems Installed at Corps Projects, US Army Corps of Engineers, ERDC/ITL TR-16–4

[] Jeon CH, Lee JB, Shim CS. Tensile Test of Corroded Strand and Maintenance of Corroded Prestressed Concrete Girders. Int J Urban Civ Eng, 2017, 11(10): 1384-1388

[] Jeon CH, Lee JB, Lon S, Shim CS. Equivalent Material Model of Corroded Prestressing Steel Strand. J Mat Res Technol, 2019, 8(2): 2450-2460,

[] Jeon CH, Nguyen CD, Shim CS. Assessment of Mechanical Properties of Corroded Prestressing Strands. Appl Sci, 2020, 10(12): 4055,

[] Lee B. Y., Koh K., Ismail M., Ryu H. S., Kwon S., Corrosion and Strength Behaviours in Prestressed Tendon Under Various Tensile Stress and Impressed Current Conditions, Adv Mater Sci Eng, 2017

[] Pillai R., Trejo D., Reinschmidt K., Hueste M. B., 2014, Predicting Residual Tensile Strength of Seven-Wire Strands Using That of Single Wires Exposed to Chloride Environments, J  Of Mater Civil Eng, August 2014, https://doi.org/10.1061/(ASCE)MT.1943-5533.0000933

[] Raoof M, Kraincanic I. Determination of Wire Recovery Length in Steel Cables and its Practical Applications. Computer and Structures, 1998, 68(5): 445-459,

[] Rosati G., Losa M., Valentini R., Tubaro S., 2° Incidente Probatorio-Perizia (Second Recording of Evidence Procedure-Expertise), Procedimento Penale N. 10468–18 R. G. N. R., N.7998–18 R.G. N. R., Tribunale di Genova, December, 21, 2020

[] Rugarli P., Considerazioni sul Crollo, 2° Incidente Probatorio (Considerations On the Collapse. Second Recording of Evidence Procedure), Procedimento Penale N. 10468–18 R. G. N. R., N.7998–18 R.G. N. R., Tribunale di Genova. October, 5, 2020 (2020a)

[] Rugarli P., Considerazioni sul Crollo-Addendum 1, 2° Incidente Probatorio (Considerations On the Collapse. Addendum 1, Second Recording of Evidence Procedure), Procedimento Penale N. 10468–18 R. G. N. R., N.7998–18 R.G. N. R., Tribunale di Genova. October, 20, 2020 (2020b)

[] Waisman H, Betti R, Montoya A. Load Transfer and Recovery Length in Parallel Wires of Suspension Bridge Cables. J Eng Mech, 2011, 137(4): 227-237

[] Woodward R.J., Williams F.W., 1988, Collapse of Ynys-y-Gwas Bridge, Proc Instit Civ Eng, Part1, Vol 84, August 1988a

[] Woodward R.J., Williams F.W., 1989, Collapse of Ynys-y-Gwas Bridge, Proc Inst Civ Eng Discussion, Vol 86, December 1988b