Discussion of “Shear Lag in Rectangular Hollow Structural Sections Tension Members: Comparison of Design Equations to Test Data” by Bo Dowswell and Stacey Barber
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Bibliographic record
Abstract
The discussers argue that the authors (Dowswell and Barber) inappropriately use data for efficiency factor (U) accuracy verification because the data, gleaned from 1999 Zhao et al. and 1995 Zhao and Hancock efforts, has a governing failure mechanism which always correponds to block shear or tear-out (TO). The discussers also argue that the authors, in calculating U, calculate weld return length (l) using a weld portion located in the weld return region which AISC definitions of l say should be neglected in calculating l. Model response validation should be done against experimental data if finite-element modeling (FEM) data is to be used. The discussers argue that the authors' inclusion of 1995 data by Girard et al. is questionable because they could not verify circumferential fracture (CF) failure mechanism reproduction capacity (and corresponding ultimate load). The discussers note, however, the authors' postulation that shear lag-induced fracture is more accurately predicted by reduced eccentricity value is correct. The discussers argue for using reduced eccentricity for connections fabricated with elliptical hollow sections and circular hollow sections for predicted capacity improvements as shown by 2006 Martinez-Saucedo et al. and 2006 Willibald et al. efforts. Shear lag reduction factor (U) influence should be assessed only by tests failing by CF. Hollow section U factor modification should be related to the latest AISC specifications.
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| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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