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Numerical Investigation of High Strength Structural Steel Gravity Columns at Elevated Temperature

Akhtar, Mohammad Farhan
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613748386003217

Abstract Details

2020, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
The research aims to evaluate the behavior of high strength structural steel (HS3) gravity columns (with yield stresses 80 ksi and greater) at elevated temperature in an effort to promote the more widespread use of this material in the United States and to evaluate the potential benefits of HS3 gravity columns over conventional steel gravity columns. Steel structures may be highly susceptible to fire. This research investigates the buckling capacity and critical temperature of HS3 gravity columns at elevated temperatures using the finite element package, ABAQUS. Finally, a case study is done to evaluate a potential material saving in using the HS3 gravity column over conventional or mild steel columns. A detailed parametric study was conducted on two wide-flange sections, W12x58 and W14x90, at elevated temperature of up to 700 oC for three high yield strengths of 550 MPa (80 ksi), 690 MPa (100 ksi), and 890 MPa (130 ksi). The numerical analysis accounted for column slenderness, uniform temperature, local and global geometric imperfections, and residual stresses. The load-carrying capacity of HS3 columns was compared with 350 MPa (50 ksi) steel columns to access its effectiveness over mild steel gravity columns. Applicability of AISC current equation for elevated temperature as well as the equations for ambient temperature was also evaluated for HS3 gravity columns. It is found that HS3 gravity columns show high load carrying capacity in comparison to mild steel gravity for all slenderness at every temperature under consideration. The temperature resistance of HS3 gravity columns is also compared with the temperature resistance of mild steel gravity columns. It is found that HS3 columns of higher slenderness are more resistant to the higher temperature in comparison to the corresponding mild steel columns. However, stub columns of both, HS3 and mild steel showed equivalent temperature resistance. Failure temperature of HS3 gravity columns was also investigated to understand the critical temperature of HS3 gravity columns under different load ratios. HS3 gravity columns were subjected to a load ratio of 0.9, 0.8, 0.7, 0.6, and 0.4 of their ambient capacity. It is found that the failure temperature of gravity columns decreases with an increasing load ratio.
Rachel Chicchi, Ph.D. (Committee Chair)
Lisa Choe, Ph.D. (Committee Member)
Gian Andrea Rassati, Ph.D. (Committee Member)
97 p.
Civil Engineering
High Strength structural steel; Numerical modeling; Elevated temperature; AISC equation; load carrying capacity; failure temperature

Recommended Citations

Citations

  • Akhtar, M. F. (2020). Numerical Investigation of High Strength Structural Steel Gravity Columns at Elevated Temperature [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613748386003217

    APA Style (7th edition)

  • Akhtar, Mohammad Farhan. Numerical Investigation of High Strength Structural Steel Gravity Columns at Elevated Temperature. 2020. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613748386003217.

    MLA Style (8th edition)

  • Akhtar, Mohammad Farhan. "Numerical Investigation of High Strength Structural Steel Gravity Columns at Elevated Temperature." Master's thesis, University of Cincinnati, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613748386003217

    Chicago Manual of Style (17th edition)

ucin1613748386003217
302
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