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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 81 Abstracts search results
October 1, 2020
Georgiou, A.; Pantazopoulou, S.
With the advent of strain hardening fiber reinforced cementitious composites (SHFRCC) the development of a new generation of structural systems that benefit from the inherent ductility of concrete in tension in order to reduce the amounts of transverse reinforcement (stirrups), shear strength, and tension-force development capacity to the main reinforcement is possible.
In this study a number of tests are conducted to explore the behavior of SHFRCC materials under cyclic loads, simulating seismic effects. The experimental responses of two half-scale
interior beam column connections subjected to reversed cyclic loading are compared; one of the connections was constructed with a cementitious matrix without fibers, and was detailed
according with the Eurocode provisions for ductility class M (moderate, μ=3.5). The other connection was constructed with a SHFRCC mix; (2% by volume of PVA fibers was used to
reinforce the matrix and the minimum amount of shear reinforcement allowed by Eurocode 2 for non-seismic detailing was used in the specimens). Several supporting experiments were also conducted to support analysis of the cyclic behavior (uniaxial tension, compression, splitting tests). The behavior of the members under reversed cyclic displacement is also simulated with advanced nonlinear Finite Element Analysis, with results that are correlated with the experimental observations. The SHFRCC specimen with minimum detailing showed improved performance and enormous ductility suggesting new possibilities to the seismic design of
Camilo Granda Valencia and Eva Lantsoght
This paper provides a practical example of the torsion design of an inverted tee bent cap of a three-span
bridge. A full torsional design following the guidelines of the ACI 318-19 building code is carried out and the
results are compared with the outcomes from CSA-A23.3-04, AASHTO-LRFD-17, and EN 1992-1-1:2004 codes.
Then, a summary of the detailing of the cross-section considering the reinforcement requirements is presented. The
objective of this paper is to illustrate the application of ACI 318-19 when designing a structural element subjected to
large torsional moments.
Thomas T. C. Hsu and Yagiz Oz
This paper presents the design of a cantilever canopy and its supporting beam for a sport stadium. The
reinforced concrete beam is analyzed and designed under the effects of shear load, bending moment, and torsion. The
design was carried out following the American Concrete Institute’s most recent standard (ACI 318-19). When there
is torsion on reinforced concrete sections, the design steps become more complicated. The formula to design and the
minimum requirements for both the longitudinal and transverse bars are changed since the torsion is included. The
design of flexural longitudinal bars is not affected from torsion however, there are needed more longitudinal bars
against torsion which affect the spacing and the detailing of longitudinal bars. For transverse bars, when the torsion
is considered, the stirrups are designed as the sum of transverse and shear requirement. The main focus of the paper
is to show the design steps and detailing of structural concrete elements under the effect of torsional moment.
Winterberg, R.; Rodrìguez, L.M.; Cámara, R.J.; Abad, D.S
Fibre reinforced concrete (FRC) is becoming widely utilized in segmental linings due to
the improved mechanical performance, robustness and durability of the segments. Further,
significant cost savings can be achieved in segment production and by reduced repair rates
during temporary loading conditions. The replacement of traditional rebar cages with fibres
further allows changing a crack control governed design to a purely structural design with
more freedom in detailing.
Macro synthetic fibres (MSF) are non-corrosive and thus ideal for segmental linings in
critical environments. Although fibre reinforcement for segments is relatively new, recent
publications such as the ITAtech “Guidance for precast FRC segments – Volume 1: Design
aspects” or the British PAS 8810 “Tunnel design – Design of concrete segmental tunnel
linings – Code of practice” have now given more credibility to this reinforcement type and the
basis for design.
This paper presents and discusses the design methodology for precast tunnel segments and
in particular the tasks associated with the use of MSF reinforcement. Temporary loadings as
well as long term load behaviour will be addressed. A case history from the Santoña–Laredo
General Interceptor Collector, currently under construction in northern Spain, will illustrate
the specific benefits of MSF reinforcement for segmental linings.
June 30, 2020
Amer Hammoud and Hassan Aoude
This paper presents the results from tests examining the performance of high-strength concrete (HSC) and normal-strength concrete (NSC) columns subjected to blast loading. As part of the study six columns built with varying concrete strengths were tested under simulated blast loads using a shock-tube. In addition to the effect of concrete strength, the effects of longitudinal steel ratio and transverse steel detailing were also investigated. The experimental results demonstrate that the HSC and NSC columns showed similar blast performance in terms of overall displacement response, blast capacity, damage and failure mode. However, when considering the results at equivalent blasts, doubling the concrete strength from 40 MPa to 80 MPa (6 to 12 ksi) resulted in 10%-20% reductions in maximum displacements. On the other hand, increasing the longitudinal steel ratio from ρ = 1.7% to 3.4% was found to increase blast capacity, while also reducing maximum displacements by 40-50%. The results also show that decreasing the tie spacing (from d/2 to d/4, where d is the section depth) improved blast performance by reducing peak displacements by 20-40% at equivalent blasts. The use of seismic ties also prevented bar buckling and reduced the extent of damage at failure. As part of the analytical study the response of the HSC columns was predicted using single-degree-of-freedom (SDOF) analysis. The resistance functions were developed using dynamic material properties, sectional analysis and a lumped inelasticity approach. The SDOF procedure was able to predict the blast response of HSC columns with reasonable accuracy, with an average error of 14%. A numerical parametric study examining the effects of concrete strength, steel ratio and tie spacing in larger-scale columns with 350 mm x 350 mm (14 in. x 14 in.) section was also conducted. The results of the numerical study confirm the conclusions from the experiments but indicate the need for further blast research on the effect of transverse steel detailing in larger-scale HSC columns.
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