Ultimate tensile strength of embedded I-sections: a comparison of experimental and numerical results

Abstract

Exposed baseplates together with anchor bolts are the customary method of connection of steel structures to the concrete footings. Post-Kobe studies revealed that the embedded column bases respond better to the earthquake uplift forces. The embedded column bases also, offer higher freedom in achieving the required strength, rigidity and ductility. The paper presents the results of the pullout failure of three embedded IPE140 sections, tested under different conditions. The numerical models are then, generated in Abaqus 6.10-1 software. It is concluded that, the steel profiles could be directly anchored in concrete without using anchor bolts as practiced in the exposed conventional column bases. Such embedded column bases can develop the required resistance against pullout forces at lower constructional costs.

Performance Investigation and Design of Pile-to-Pile Cap Connections Subject to Uplift

“…With the exception of specimen C1, anchorage only succeeded in pulling out a larger area of concrete around the pile, and consequently more closely resembles punching failure of a footing. These data are consistent with other anchors tested by GAI Consultants (cap plates, angles, and bar grids) and further supports the hypothesis that anchorage whose primary resisting mechanism is bearing near the tip of the pile is not effective and may actually be detrimental to the connection ( 7 , 16 ). Pertold’s findings agree with this as he states that the “punching resistance for a certain geometry of the concrete base could be less efficient at resisting the vertical load from column than bond resistance” ( 8 ).…”

“…Heristchian compared the experimental and numerical capacities of three embedded IPE140 sections with and without baseplates. In conjunction with prior research, Heristchian observes that the introduction of the end plate or utilizing tapered sections mobilizes a bearing force that has higher unit stresses than shear and is closely related to the punching resistance of the concrete ( 16 , 17 ). He concludes that more experimental data and numerical models on pullout behavior are necessary to verify and validate the results.…”

“…The focus of this work is on the ultimate capacity of pile-to-pile cap connections and, as such, emulating field conditions was critical. The testing layout and specimen dimensions utilized emphasize this while also seeking to minimize the effect of arbitrary stress introduction at the pile face, which is an important consideration ( 16 ). The test setup resembles that of Horn 1972 but includes a few modifications/improvements.…”

Contact Modeling of the Duct-Concrete Interface in the Evaluation of Multistrand Effect in High Curvature Post-Tensioned Tanks

“…The duct is a cylindrical tube curved in order to adapt to the cylindrical shaft of the tank, hence forming a toroidal contact interface between the smooth steel and the concrete hole formed during casting. It is widely covered in the literature (see [3], [4], [5], [6], [7] and [8]) that bonding between steel rebars and concrete involve several processes that result in a traction-slip law.…”