SSRC 2017 Annual Stability Conference

Session S10: Stability of Plates
Friday, March 24, 2017
8:00 a.m.

Web Crippling Strength of Longitudinally Stiffened Steel Plate Girder Webs Subjected to Concentrated Loading

There are several methodologies for calculation of ultimate load resistance of slender beams subjected to concentrated loads, the two most important are represented in the Code of Standard Practice for Steel Buildings and Bridges (AISC 2010) and Eurocode 3: Design of steel structures Part 1-5 (EC3 Part 1-5). This paper aims at comparing the predictions of four different solutions for ultimate resistance against 45 experimental tests results. This comparison includes the solution of limit state of web local crippling found in the AISC (2010) standard, a reviewed version of the EC3 Part 1-5 rules and a solution based on a modified failure mechanism that considers the longitudinal stiffening influence on slender beams subjected to concentrated loads. The results show that theoretical predictions of ultimate load work well when the influence of a longitudinal stiffener is considered.

Nelson Loaiza and Carlos Graciano, Universidad Nacional de Colombia, Medellín, Colombia; Rolando Chacón, Universitat Politècnica de Catalunya, Barcelona, Spain

SSRC 2017 Annual Stability Conference

Session S7: Stability of Columns
Thursday, March 23, 2017
1:15 p.m.

The Effects of Accurate Boundary Condition Modeling on Column Stability

Idealization of real-world boundary conditions as either “free,” “pinned,” or “fixed” is common in engineering practice. This research explores the effect of modeling more realistic, in-situ support conditions on column stability. Abaqus is used to assess the moment-rotation capacity of a suite of connections representing commonly encountered boundary conditions. Parameters such as variable axial loads, contact or bearing within the connection, and component yielding are incorporated into the FEA model. The results of the FEA are then used in OpenSees to predict column capacity through a large-displacement, inelastic analysis.

Cliff D. Bishop and Patxi Uriz, Exponent Inc., Menlo Park, CA