Tension plane behavior in single-row bolted connections subject to block shear
✍ Scribed by James G Orbison; Mark E Wagner; William P Fritz
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 269 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0143-974X
No coin nor oath required. For personal study only.
✦ Synopsis
Previous studies of block shear connection failures have shown that current procedures, in use in the United States, to estimate ultimate load capacities, can produce both conservative and un-conservative estimates of block shear failure loads. In this study, a series of 12 A36 steel short tension specimens, with single-row bolted end connections designed to fail in block shear, was tested. Strain gages were mounted on the net tension plane of each specimen to determine the strain distribution under varying conditions of in-plane eccentricity and edge distance, out-of-plane eccentricity, and connection length. All specimens failed in block shear. The failure mechanism involved rupture of the net tension plane, initiating in all cases at the bolt hole, with significant inelastic deformation of the gross shear plane area. Additional tests, using specimens designed to develop the ultimate load capacity of the shear plane alone, were also conducted. For the geometries tested, in-plane and out-of-plane eccentricity were not seen to influence load capacity significantly. However, the results indicate that the stress concentration developed at the tension plane bolt hole can limit block shear load capacity. Small edge distances allow the stress concentration to extend over much of the tension plane, resulting in relatively early rupture and thus limiting load development on the shear plane.