Title:
Behavior and Design of Connections Between Column and Foundation with Cast-in and Post-Installed Reinforcing Bars
Author(s):
Rolf Eligehausen
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/25/2020
Abstract:
Precast or steel columns may be connected to a foundation with cast-in hooked or straight deformed reinforcing bars or with post-installed straight deformed reinforcing bars. Connections with cast-in or post-installed bars may either be designed according to the strut-and-tie method or according to provisions for anchoring to concrete for bonded anchors (straight bars) or headed anchors (hooked bars). In general, the strength of the connections calculated with these different provisions differ significantly. Monotonic and simulated seismic tests of full-scale column-foundation connections were performed to investigate failure mode and strength of the connections. Varied was the number and diameter of column bars and their anchorage length in the foundation. Comparison tests were performed with hooked and straight bars as well as post-installed bars using a high strength mortar with the same anchorage length. In addition, finite element simulations were performed using the non-linear FE program MASA. The test results will be shown, and they will be compared with different design models. The presentation will discuss in detail design implications following from this research.