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Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.

This Week's Featured Presentation

Stress-Strain Model of Concrete Confined by FRP Laminate and Spike Anchors
Presented by: Zhibin Li, Auckland University of Technology

Presentation details

FRP Use in Column Applications (ACI Spring 2024, New Orleans, LA) The application of fiber-reinforced polymer (FRP) jacketing for confinement may not always be feasible, particularly in cases where adjacent elements obstruct the structural member and prevent wrapping. To address this issue, the utilization of FRP laminate and spike anchors has been proven as an alternative solution. This study focuses on proposing a design methodology for this particular application. A stress-strain model was developed to assess the behavior of concrete prisms confined with FRP laminates and spike anchors under axial compression. The model adopts a bi-parabola stress-strain curve, with the coefficients derived from previously published experimental data on concrete prisms confined using this solution. The comparison between the analytical and tested stress-strain curves yielded a coefficient of determination (R2) averaging at 0.96, demonstrating the effectiveness of the bi-parabola model in describing the tested stress-strain responses.


Upcoming Presentation

November 11 - 17

Topology Optimization Based Additive Construction
Presented by: Islam Mantawy, Rowan University

Presentation details

Structural Performance of Additively Constructed Concrete (ACI Spring 2024, New Orleans, LA) For decades, concrete structures are constructed using cementitious based materials using conventional methods through formworks (either cast-in-place or precast). Concrete with sufficient slump is needed to fill up the formworks. This approach results in significant material wastage (where the material is placed at areas with low to very low stresses) and increases carbon footprint. Additive construction provides unique opportunities to build form-free structural elements with complex geometry which enable topology and structural optimization. This presentation include 1) Development of 3D-printed versions of concrete with lower carbon footprint; 2) utilization of advanced modelling techniques for topology and structural optimization of structural elements; 3) utilization of strut-and-tie methods for topology and structural optimization, and 4) small scale and large scale additive construction for optimized structural beam. The presentation will conclude with detailed comparison between conventionally constructed beam and additively constructed beam in terms of materials saving and emission reduction.

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