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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 192 Abstracts search results
Document:
24-209
Date:
July 31, 2025
Author(s):
Isabella Rakestraw, John Corven, Armin Mehrabi, and David Garber
Publication:
Structural Journal
Abstract:
Current design assumptions for precast prestressed concrete piles embedded in cast-in-place (CIP) pile caps or footings vary across states, leading to inconsistencies in engineering practices. Previous studies suggest that short embedment lengths (0.5 to 1.0 times the pile diameter) can develop approximately 60% of the bending capacity of the pile, with full fixity potentially achieved at shorter embedment lengths than current design specifications due to confinement stresses1. This study experimentally evaluates 10 full-scale pile-to-cap connection specimens with varying embedment lengths, aiming to investigate the required development length for full bending capacity. The findings demonstrate that full bending capacity can be achieved at the of pile-to-pile cap connection with shallower embedment than code provisions, challenging existing design standards and highlighting the need for more accurate guidelines for bridge foundation design.
DOI:
10.14359/51749101
24-411
June 18, 2025
Jerry Y. Zhai and Jack P. Moehle
Laboratory tests of deep, lightly reinforced concrete members without shear reinforcement demonstrate that the nominal shear stress at failure decreases with increasing depth and with decreasing tension longitudinal reinforcement ratio. Design procedures for one-way shear strength in ACI 318-19 incorporate these effects but result in relatively low design shear strengths for members with both large depth and low reinforcement ratio. To better understand the effects of depth and longitudinal reinforcement on shear strength, tests were conducted on beams with varying depth, a relatively low ratio of high-strength longitudinal reinforcement, and with either no shear reinforcement or minimum shear reinforcement. Loads were applied slowly and monotonically and included concentrated loads plus self-weight. Beam supports were either point supports, as in a beam, or uniformly distributed, similar to some foundation reactions. The test results demonstrate size and longitudinal reinforcement effects and suggest that a lower-bound unit shear strength may be applicable for the design of members with both large depth and low reinforcement ratio.
10.14359/51748931
24-358
March 25, 2025
Benjamin Worsfold, Dara Karać, and Jack Moehle
Steel columns are commonly attached to concrete foundations with groups of cast-in-place headed anchors. Recent physical tests and simulations have shown that the strength of these connections can be limited by concrete breakout failure. Four full-scale physical specimens of axially loaded columns attached to a foundation slab were tested, varying the shear reinforcement configuration in the slab. All specimens were governed by concrete breakout failure. The tests suggest that adequately placed distributed shear reinforcement can increase connection strength and displacement capacity. Steep cone failures were observed to limit the beneficial effect of shear reinforcement. Calibrated finite element models were used to investigate critical parameters such as the extent of the shear-reinforced region and bar spacing. A design approach is proposed to calculate connection strength by adding the strength of the concrete and the distributed shear reinforcement. Design detailing is discussed.
10.14359/51746720
23-334
December 1, 2024
Christopher Wilkes, Fragkoulis Kanavaris, Chris Barker, and Duncan Nicholson
Materials Journal
Volume:
121
Issue:
6
This paper presents a method for simply qualifying the practical risk of casting deep foundations based upon a combination of the behavior of the fresh concrete through testing and the confinement conditions of the foundation from a design perspective. A framework to qualify which aspects of the tremie process lead to defects is developed for the first time. Flow behavior, confinement conditions, and free-water availability are identified as key contributors to specific defects present within tremie concrete foundations. Finally, a novel risk map for tremie concrete is presented.
10.14359/51742262
22-401
September 1, 2024
G. F. Crocker, B. E. Ross, M. C. Kleiss, P. Okumus, and N. E. Khorasani
5
This paper describes the experimental testing of a reinforced concrete tessellated shear wall. The wall specimen was tested as part of a National Science Foundation-funded research project designed to demonstrate the concept of tessellated structural-architectural (TeSA) systems. TeSA systems are constructed of topologically interlocking tiles arranged in tessellations, or repeating geometric patterns. As such, these systems are designed with easy repair and reuse in mind. The specimen discussed in this paper is a TeSA shear wall constructed from individually precast I-shaped tiles. This paper presents the results of reverse cyclic loading of the specimen, including load-displacement behavior, crack propagation, and energy dissipation. A simplified analytical model for predicting the wall’s flexural capacity is also discussed.
10.14359/51740848
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