عنوان

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

شماره

TL57995

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

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

نام عام مواد

[Thesis]

نام نخستين پديدآور

Akhtar, Mohammad Farhan

نام ناشر، پخش کننده و غيره

University of Cincinnati

تاریخ نشرو بخش و غیره

2020

متن يادداشت

99 p.

جزئيات پايان نامه و نوع درجه آن

M.S.

کسي که مدرک را اعطا کرده

University of Cincinnati

امتياز متن

2020

متن يادداشت

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 W14×90, at elevated temperature of up to 700 °C 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.

اصطلاح موضوعی

Civil engineering

مستند نام اشخاص تاييد نشده

Akhtar, Mohammad Farhan

مستند نام تنالگان تاييد نشده

University of Cincinnati

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y