Sessions & Events

 

All sessions and events take place in Central Daylight Time (CDT).
All events take place at the Hyatt Regency New Orleans.

On-demand sessions will be available for viewing in the convention platform/event app under "On-Demand Content" within 24-48 hours of the session premiere. Please note, on-demand sessions are not available for CEU credit. *Denotes on-demand content.


MINI SESSION: Seismic Research Presentations by Younger Members

Tuesday, March 26, 2024  1:00 PM - 2:00 PM, Empire C

ACI 341 will be regularly hosting mini sessions at each convention aimed at providing an opportunity for graduate students and early career individuals to present their research. We are coordinating this effort with the other ACI seismic committees.

Learning Objectives:
(1) Discuss state-of-the-art research conducted at universities in the realm of seismic design;
(2) Establish an avenue for early career researchers to convey their work and get them excited about ACI committee activities;
(3) Establish an avenue for early career researchers to convey their work;
(4) Prepare young professionals to engage in ACI committee activities.

This session has been approved by AIA and ICC for 1 PDH (0.1 CEU). Please note: You must attend the live session for the entire duration to receive credit. On-demand sessions do not qualify for PDH/CEU credit.


Quantifying the effects of Seismic Loading History on the Collapse Behavior of Concrete Columns

Presented By: Seyed Sasan Khedmatgozar Dolati
Affiliation: Stantec
Description: Experimental studies have indicated that the lateral and axial behaviors of concrete columns under seismic excitation can be highly dependent on loading history, particularly at high-damage states. However, due to cost limitations, most experiments on concrete columns have used fully reversed cyclic loading protocols, with only limited tests in the literature exploring the effects of loading history on behavior. Consequently, current modeling parameters and acceptance criteria for assessing seismic vulnerability are based on typical reversed cyclic loading protocols, which can make them overly conservative for short duration or near-field motions, and possibly unconservative for long-duration ground motions generated in basins or subduction regions. Due to lack of experimental data, continuum finite element models were constructed covering a relatively wide range of column parameters and failure modes to explore the effects of loading history on both lateral and axial degradation of concrete columns. A first set of over 30 column models were constructed to replicate tested columns and calibrated to those experimental tests, which were conducted under varying lateral loading protocols. Columns were selected to cover a range of shear stresses, axial loads, transverse reinforcement spacings and ratios, and longitudinal reinforcement ratios. Calibrated column models were then subjected to a series of loading protocols, including monotonic pushover, and non-symmetric ratcheting protocols. The effects of the lateral loading protocols on damage progression, strength, and deformation capacities were identified and quantified for concrete columns.


Shake Table Tests of Concrete Columns with High Strength Steel Reinforcement

Presented By: Eugenia Campos Carranza
Affiliation: North Carolina State University
Description: The advantages of using high strength steel (HSS) in lieu of conventional reinforcement are widely acknowledged. The adoption of HSS reinforcement reduces congestion and, when applied to transverse reinforcement, HSS provides greater confinement at the same level of detailing, which results in increased restraint against bar buckling. However, as the strength increases the strain hardening plateau extension reduces which means less elongation capacity of the reinforcing bars. Consequently, some codes in high seismic regions have restricted the use of steel with minimum yield strength of 80 or higher in plastic hinge zones until more data becomes available. Past research has focused on material behavior and quasi-static tests, where it was found that two major parameters, rebar geometry and manufacturing process, impacted the displacement capacity of columns with HSS reinforcement. After considering the above parameters and introducing innovative detailing configurations, it was determined that columns reinforced with HSS not only met, but in certain instances surpassed the displacement capacity of columns with conventional reinforcement. Nevertheless, further research with application of dynamic loading and its effects on strain rate is needed. In this presentation, the major outcomes from previous experimental studies are addressed, to later introduce the current investigation on seismic performance of HSS reinforced concrete columns under dynamic loading through shake table test.

Upper Level Sponsors

ACI Northern California and Western Nevada Chapter
Baker
Conseal
Euclid Chemical
FullForce Solutions
Master Builders
Natural Resources Research Institute - University of Minnesota
PS=0