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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 1333 Abstracts search results
Document:
CI4704ConcreteQA
Date:
April 1, 2025
Publication:
Concrete International
Volume:
47
Issue:
4
Abstract:
While completing concrete repairs, is it necessary to remove sound concrete if a nearby reinforcing bar exhibits rust? Can terms like corrosion or rust be used interchangeably? This month’s Q&A provides answers to these questions as well as a discussion on various factors influencing the extent of a repair of corrosion-related damage in concrete structures.
SP365_04
March 1, 2025
Author(s):
Neul Oh, Junhwi Ye, Hyukjun Ahn and Jae-Yeol Cho
Symposium Papers
365
This paper reviews the state-of-the-art finite-element analysis (FEA) for reinforced concrete (RC) structures subjected to high-strain-rate deformation and focuses on RC panels subjected to impact loads. Despite extensive experimental studies on the impact behavior of RC panels, a robust concrete material model for accurate simulation of high-strain-rate scenarios is lacking. To address this gap, this study aims to identify the optimal concrete material model for predicting local damage in RC panels impacted by projectiles by simulating the collision of a large commercial aircraft with critical infrastructures, such as nuclear power plants. In this study, the theoretical foundations and parameters of concrete material models were examined to simulate realistically the local responses of RC panels subjected to dynamic loading, specifically focusing on hard projectile impacts at velocities ranging from 100 to 220 m/s (328 to 722 ft/s). Single-element analyses were conducted followed by finite-element simulations of scaled-down aircraft impact tests to assess the ability of the models to predict the failure modes, residual projectile velocities, and damaged areas. Among the four concrete models available in LS-DYNA, the concrete damage model (release 3) provided the best results for the four panels experimentally tested in this study.
DOI:
10.14359/51746684
SP365_05
David Z. Yankelevsky, Yuri S. Karinski, and Vladimir R. Feldgun
Punching shear failure of RC flat slab connections cause loss of slab’s supports. The detached slab is falling and impacting the slab below. That problem requires thorough investigation and appropriate design guidelines. This paper presents research results on various aspects of this impact scenario. The analysis is based on an advanced numerical model that has been formulated, and the impact analyses follow the damage evolution in the concrete and reinforcement until complete connections failure of the impacted slab is developed, and a progressive collapse scenario starts. The effects of slab geometry and material properties were examined, and the contribution of special shear reinforcement and integrity rebars were investigated. The potential contribution of added drop panels to enhance slab resistance were examined. The slabs impact effect on the supporting columns has been investigated as well. The suitability of current static loading design-criteria to provide safe design against dynamic/impact punching shear is assessed. It shows that the current static-loading based design standards cannot ensure resilience of flat slab connections to impact loading and therefore cannot prevent a progressive collapse scenario. Analyses results are compared with inspected failure details of a collapsed RC flat slabs parking garage building, and excellent agreement is obtained.
10.14359/51746685
SP365_09
Amirali Bahnamiri and Trevor D. Hrynyk
This paper presents a review of different modeling techniques that have been proposed to employ visual concrete cracking measurements as input in ‘crack-based’ reinforced concrete analysis procedures. The suitability of a recently developed crack-informed modeling approach that incorporates concrete cracking measurements as model input, using an equivalent loading approach where concrete cracks are replaced by fictitious loads that induce similar damage, is examined for applications involving idealized RC panel elements presented in the literature. The procedure employs the formulations of the Disturbed Stress Field Model (DSFM) as the basis for cracked reinforced concrete material and compatibility modeling and a solution framework that permits simple implementation in smeared crack continuum analysis procedures. Preliminary results indicate that crack-based modeling procedures can be used to provide enhanced performance assessments of cracked RC components.
10.14359/51746689
CI4701Pujol
January 1, 2025
Santiago Pujol, Rémy D. Lequesne, and Chungwook Sim
1
This article describes trends observed between measures of building robustness and observations of performance collected after 15 earthquakes. It provides comparisons between countries that followed the Japanese preference for “stiff” structures and those that build less-stiff structures and discusses implications of the latest field observations in relation to the future of reinforced concrete practice.
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