2017 Annual Stability Conference Presentation

Session S5 – Stability of Members and Connections
Thursday, March 23, 2017
8:00 am

Lateral-Torsional Buckling of Simply Supported Anisotropic Steel-FRP Beams Under Pure Bending Condition

In this paper, a generalized analytical approach for lateral-torsional buckling of simply supported anisotropic hybrid (steel-FRP), thin-walled, rectangular cross-section beams under pure bending condition was developed using the classical laminated plate theory as a basis for the constitutive equations. Buckling of such type of hybrid members has not been addressed in the literature. The hybrid beam, in this study, consists of a number of layers of anisotropic fiber reinforced polymer (FRP) and a layer of isotropic steel sheet. The isotropic steel sheet is used in two configurations, (i) in the mid-depth of the beam sandwiched between the different FRP layers and (ii) on the side face of the beam. A closed form buckling expression is derived in terms of the lateral, torsional and coupling stiffness coefficients of the overall composite. The analytical formula is verified against finite element buckling solutions using ABAQUS for different lamination orientations showing excellent accuracy.

Hayder A. Rasheed, Habiburrahman Ahmadi and AlaaEldin Abouelleil, Kansas State University, Manhattan, KS

TG05 friends and colleagues,

We are thrilled to launch the TG05 Thin-Walled Structures page. This page will be used for the dissemination of tools and resources, as well as for announcements and updates. Please contact the chair or co-chair if you wish you have your work featured in this space.

2017 Annual Stability Conference Presentation

Session SS1A – Stability of Thin-Walled Components and Assemblages
Tuesday, March 21, 2017
1:40 pm

Experimental Study on System Reliability of Cold-Formed Steel Roof Trusses

This paper presents a research project aimed at advancing the treatment of cold-formed steel (CFS) structural reliability in roof trusses. Structural design today relies almost exclusively on component-level design, so structural safety is assured by limiting the probability of failure of individual components. Reliability of the entire system is typically not assessed, so in a worst-case scenario the system reliability may be less than the component reliability, or in a best-case scenario the system reliability may be much greater than the component reliability. This research assesses a series of full-scale static tests on single cold-formed steel roof trusses with a unique experimental setup. The test specimens were carefully monitored to address multiple failure modes: buckling of the top chord, buckling of the truss webs, and any connection failures. This paper includes the experimental results, the computed system reliability of the trusses as well as their relationship between the components reliability.

Adam M. Johnson and Cheng Yu, University of North Texas, Denton, TX; Brooks Smith and Cristopher D. Moen, NBM Technologies, Inc., Baltimore, MD

On April 7, 2017 at the ASCE/SEI Structures Congress in Denver, Colorado, W. Samuel Easterling, Ph.D., P.E., F.SEI, F.ASCE received the Shortridge Hardesty Award for his leadership and service to the profession, particularly as past chair of the Structural Stability Research Council, and for his contributions in the field of steel-concrete composite systems.  Congratulations to Sam on this well-deserved recognition!

Applications are now being accepted for the 2017 SSRC McGuire Award for Junior Researchers (MAJR Medal). Please visit the Awards page for detailed information. This award was established in honor of the late William “Bill” McGuire, a long-term member of SSRC who always emphasized that state-of-the-art research is instrumental to improve the quality of stability design. Applications must be submitted to Janet Cummins ssrc@aisc.org by July 28, 2017. The 2017 MAJR Medal will be presented at the 2018 SSRC Annual Stability Conference, April 10-13, 2018 in Baltimore, MD.

2017 Annual Stability Conference Presentation

Session S6 – Stability of Assemblages and Systems
Thursday, March 23, 2017
10:15 am

Stability and Strength Behavior of Thin-Walled Roof-Panel-Purlin System under Wind Loading

Integrated computational fluid dynamics and finite element based studies examining the stability and strength behavior of thin-walled structures’ cladding and component systems subjected to realistic wind loading are conducted. Spatial variation of wind and wind-directionality impact on the buckling and collapse modes of the light-weight steel roof panel-purlin system underscore the need for proper accounting of spatiotemporal wind effects on low-rise buildings in improving current limitations in wind analysis and design, and highlighting future potential extreme wind-hazard mitigation implementation with structural-aerodynamic optimization of thin-walled structures.

Yared Shifferaw and Kermelos Woldeyes, Drexel University, Philadelphia, PA; Girma Bitsuamlak, University of Western Ontario, London, ON, Canada