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MULTI-SCALE EFFECTS OF CORROSION ON STEEL STRUCTURES

Gowda, Sunil
http://rave.ohiolink.edu/etdc/view?acc_num=akron1469007207

Abstract Details

2016, Doctor of Philosophy, University of Akron, Civil Engineering.
Corrosion is a naturally occurring process which under favorable environmental conditions, causes deterioration of metals when exposed to corrosive environment for an extended period of time. This time dependent factor related to corrosion rate is an important factor among others, affecting the process of corrosion itself. Some of these factors can be controlled and some may not. Steel structures like bridges are essentially made of structural members such as beams, compression members and plate girders. Ship structures are made up of a combination of steel plates and stiffened panels. Such structural steel members, in their respective applications are susceptible to different types of corrosion depending on the environment they are exposed to. Uniform corrosion, non-uniform corrosion and pitting corrosion are the most common types of corrosion affecting all of the mentioned steel structural members. Without proper maintenance procedures, corrosion can cause needless financial and safety burdens on steel structures. Therefore, studying the effect of these types of corrosion on the strength of structural members used in civil engineering applications, forms the core objective of this research. In order to achieve the desired objective of this research, a “multi-scale” approach was taken to understand the effects of corrosion on steel structures. A framed industrial steel structure in Akron, Ohio which is part of a salt manufacturing plant was considered and the global effect of uniform corrosion on the entire framework consisting of standard steel shapes such as wide flanged beams, angles, channel sections and hollow sections is studied. This constitutes the mega-scale level in this study. The macro-scale level consists of studying the effects of non-uniform corrosion on the load carrying capacity of individual members which make up a structural system, such as wide flanged beams. These beams are assumed to have reduced thicknesses in either the webs or flanges, simulating non-uniform corrosion occurring along the length of the beam and are analyzed using a standard finite element analysis program ABAQUS to determine the load carrying capacity of deteriorated I-beam sections. The effect of various levels of pitting corrosion including beams with web holes are also simulated and analyzed to determine the strength reduction of a beam. Steel plates and stiffened panels which form the core structural components in ship structures are also considered to study the effects of corrosion on the strength of these members under appropriate loading and boundary conditions. An accelerated corrosion procedure called GMW14872 was employed to corrode ASTM E8 samples and to study the effects of corrosion on short term and long term mechanical properties such as tensile and fatigue strengths of ASTM A572 structural steel. This forms the micro-level in the multi-scale approach. Scanning electron microscopy was employed to study the effects of corrosion on the mechanical properties of steel samples by observing the optical micrographs at high magnifications.
Anil Patnaik (Advisor)
Tirumalai Srivatsan (Advisor)
Craig Menzemer (Committee Member)
Ping Yi (Committee Member)
Nao Mimoto (Committee Member)
Civil Engineering
Corrosion; steel structures

Recommended Citations

Citations

  • Gowda, S. (2016). MULTI-SCALE EFFECTS OF CORROSION ON STEEL STRUCTURES [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469007207

    APA Style (7th edition)

  • Gowda, Sunil. MULTI-SCALE EFFECTS OF CORROSION ON STEEL STRUCTURES. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1469007207.

    MLA Style (8th edition)

  • Gowda, Sunil. "MULTI-SCALE EFFECTS OF CORROSION ON STEEL STRUCTURES." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469007207

    Chicago Manual of Style (17th edition)

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