Moderator: Dr Abbas Mokhtar-zadeh
The objective of this session is to explore the latest advancements in emerging technologies that are enhancing the accuracy, reliability, and efficiency of finite element analysis (FEA) in the simulation and design of structural concrete. The focus will be on improving simulation techniques, material models, and computational tools, thereby enhancing the confidence of engineers and researchers in using FEA for concrete structures. The session aims to bridge the gap between cutting-edge technology and practical application in structural concrete, providing solutions to common challenges faced in the modeling and analysis of complex concrete systems.
Learning Objectives
(1) Evaluate the influence of geometric and material nonlinearities on finite element modeling accuracy in reinforced concrete structures. Participants will learn how different nonlinear behaviors affect simulation outcomes and structural performance predictions;
(2) Compare experimental validation techniques, such as laser scanning and physical testing, with simulation results for large-scale concrete structures. Attendees will understand the process of aligning real-world measurements with computational models for enhanced model reliability;
(3) Analyze the structural behavior of specialized precast connections using nonlinear finite element methods and bond-slip modeling. Engineers will gain insight into the mechanisms and modeling techniques for precast concrete splice performance;
(4) Differentiate between the simulation strategies for various concrete elements including shear walls, hooked bar splices, and beam-column joints under cyclic loading. This objective provides participants with comparative tools to select appropriate modeling techniques for different structural components.
Moderators: Dr Mervyn J Kowalsky, Dr Jeffrey Rautenberg
Estimates of the deformation capacity of RC structures have been developed since the late 90’s. There are numerous methods proposed within seismic design and assessment guidelines to estimate deformation capacity, which can lead to variations in the assumed capacity of the structure. The objective of this session is to compare the effectiveness of existing methods to estimate deformation capacity of RC structures as well as propose alternative, novel methods. The implications of these results will be discussed.
Learning Objectives:
(1) Understand potential opportunities for the use of machine learning in defining variables that impact displacement capacity;
(2) To reassess long standing relationships for P-D instability and it's role in displacement capacity assessment;
(3) Evaluate the importance of design and detailing variables on limit state definitions;
(4) To critically examine the merits of a range of techniques for displacement capacity prediction.
Moderators: Mr Gary J Klein, Mr Andrew Philip Stam
This session will review updates to PRC-445.2-21: Strut-and-Tie Method Guidelines, which will include general updates as well as updates to conform to ACI 318-25. The session will also feature both new and updated design examples using the strut-and-tie method.
Learning Objectives:
(1) Understand the application of the latest ACI requirements for design of deep beams using the strut-and-tie method;
(2) Understand the application of the latest ACI requirements for design of column corbels using the strut-and-tie method;
(3) Understand the application of the latest ACI requirements for design of high walls with openings using the strut-and-tie method;
(4) Understand the application of the latest ACI requirements for design of transfer girders using the strut-and-tie method.
Moderator: Phil Diekemper
This session, sponsored by PRO: An ACI Center of Excellence for Advancing Productivity, will share progress from PRO’s Task Groups that address key barriers to concrete construction productivity. Attendees will learn about key barriers that hamper concrete construction productivity. Attendees will gain access to solutions project stakeholders can deploy to improve project results and enhance owner value.
Learning Objectives:
(1) Identify key barriers that hamper concrete construction productivity;
(2) Evaluate strategies for improving construction documents to support productive project execution;
(3) Explore tools that unleash innovation in concrete design and construction;
(4) Analyze how contracts can create risk aversive project stakeholder silos and propose solutions to mitigate these effects;
(5) Outline steps that embrace productivity enhancing products, tools, and systems;
(6) Access and apply resources to improve concrete construction productivity during the design phase.
Moderator: Dr Abbas Mokhtar-zadeh
The objective of this session is to explore the latest advancements in emerging technologies that are enhancing the accuracy, reliability, and efficiency of finite element analysis (FEA) in the simulation and design of structural concrete. The focus will be on improving simulation techniques, material models, and computational tools, thereby enhancing the confidence of engineers and researchers in using FEA for concrete structures. The session aims to bridge the gap between cutting-edge technology and practical application in structural concrete, providing solutions to common challenges faced in the modeling and analysis of complex concrete systems.
Learning Objectives:
(1) Analyze early-age nonlinear behavior in reinforced concrete box girder decks by modeling creep, shrinkage, and thermal effects using advanced finite element methods. Participants will explore how early-age material properties influence cracking risk and performance in complex bridge systems;
(2) Evaluate the impact of geometric restraint and thermal boundary conditions on the development of early-age transverse cracking in cast-in-place bridge decks. Engineers will learn how structural configuration and real-world constraints contribute to long-term durability concerns;
(3) Assess the sensitivity of low-rise concrete shear wall performance predictions to user-defined input parameters such as initial stiffness and tensile strength. Attendees will understand how these critical assumptions influence simulation accuracy and seismic demand estimation;
(4) Compare the effectiveness of mesh refinement and nonlinear material modeling in accurately capturing hysteretic behavior and drift response in shear-dominated structural systems. This objective provides participants with practical techniques to ensure robust FEA model validation against experimental and code-based benchmarks.
Moderator: Dr Srishti Banerji
Ultra-high performance concrete (UHPC) is a novel class of concrete that has superior mechanical properties and durability characteristics. Although UHPC exhibits exceptional performance at room temperature, the behavior of UHPC under fire conditions can be of concern due to faster degradation of strength and modulus properties with temperature, as well as its high susceptibility to fire-induced spalling. Since UHPC is a new construction material, there is limited information on its fire performance. This session will invite research and industry groups to share information on the fire performance of UHPC with students, faculty, researchers, and practitioners. Attendees will learn about the current fire problems in UHPC, recognize knowledge gaps and research needs, and practical solutions for improving UHPC fire performance.
Learning Objectives:
(1) Become familiar with fire testing of UHPC at material and structural levels, including intermediate, and full-scale evaluations;
(2) Understand the behavior of UHPC under elevated temperatures, including changes in mechanical and thermal properties, and assess the potential for post-fire strength recovery;
(3) Evaluate the effects of fiber type and dosage on the fire performance of UHPC, focusing on spalling resistance and strength retention at high temperatures;
(4) Apply optimization strategies to enhance fire resistance of UHPC, including adjustments to mixture composition, curing regimes, and structural detailing for future design guidelines.
Moderators: Mr Gary J Klein, Mr Andrew Philip Stam
This session will review updates to PRC-445.2-21: Strut-and-Tie Method Guidelines, which will include general updates as well as updates to conform to ACI 318-25. The session will also feature both new and updated design examples using the strut-and-tie method.
Learning Objectives:
(1) Understand the application of the latest ACI requirements for design of bent caps using the strut-and-tie method;
(2) Understand the application of the latest ACI requirements for design of dapped-end beams using the strut-and-tie method;
(3) Understand the application of the latest ACI requirements for design of cantilever beams with openings using the strut-and-tie method;
(4) Understand the application of the latest ACI requirements for design of pile caps using the strut-and-tie method.
Moderators: Dr Jason Weiss, Dr Franco Zunino
The objective of this session is to present state-of-the-art information that links the state of the practice with low GWP mixtures. The pros and cons of low GWP mixtures will be discussed as they relate to service life. It is anticipated that this session will highlight beneficial outcomes associated with high clinker replacements with reactive supplementary cement. The talks will also highlight concerns related to low CH, corrosion resistance, and freeze-thaw resistance. The audience would be researchers, material suppliers, and design professionals.
Learning Objectives:
(1) To understand what is meant by low clinker;
(2) To understand durability challenges that may arise with low clinker materials;
(3) To examine testing procedures and alterations to testing procedures that are needed for long term durability;
(4) To examine the relationship between GWP with long term durability.
Moderator: Mr David Shook
Structural engineers face growing pressure to minimize slab thickness for cost and carbon reduction while ensuring adequate deflection performance. Limited resources and minimal guidance from building codes on long-term deflection methods add to the challenge. This session, designed for practicing engineers but valuable to academics and contractors as well, provides insights from experienced professionals on best practices in long-term slab deflection analysis. Attendees will gain practical knowledge to enhance their design decisions.
Learning Objectives:
(1) Disseminate expert knowledge of long-term slab deflections considering various methods of creep, shrinkage, and cracking for typical buildings and unique structures;
(2) Comparison of field-measured deflection performance compared to calculated deflection;
(3) Methods used by practicing engineers for successful design in a broad range of applications;
(4) Considerations of construction impacts on long-term deflection design and performance.
ACI President Maria Juenger invites all convention attendees to the President’s Reception, where you’ll have the opportunity to network with committee Chairs, chapter Presidents, and international attendees. An assortment of food and a hosted bar will be available.