Introduction to ACI-PCI 319-ACI-PCI_319_Part2

ACI-PCI_319_Part2_Handout

Pdf Summary

The webinar titled "Introduction to ACI-PCI 319: Structural Precast Concrete Code Requirements and Commentary," presented by Dr. Ned Cleland and SK Ghosh, provides an overview and technical update of the newly developed ACI/PCI CODE 319-25. This code, jointly created by the American Concrete Institute (ACI) and the Precast/Prestressed Concrete Institute (PCI), addresses specific precast concrete requirements that have evolved due to limitations of previous ACI codes and the increasing need for mandatory language in building codes.<br /><br />The presentation reviews the historical collaboration between PCI and ACI, dating back to 1959, and highlights major code milestones, including the transition of ACI 318 to ultimate strength design and member-based provisions. Loss of PCI’s direct influence on ACI 318 content led to the development of the standalone PCI Design Standard, culminating in the ACI-PCI 319.<br /><br />ACI-PCI 319 aligns with ACI 318 chapter numbering, referencing and clarifying common provisions while introducing new precast-specific requirements, such as torsion design, corbel and dapped/notched end beam design, bearing regions, intermediate precast structural walls, and diaphragm design incorporating cast-in-place pour strips. The code defines detailed provisions for seismic-force-resisting systems including ductile and strong connections in intermediate precast shear walls, demands for reinforcement development, shear friction evaluation, shear transfer in diaphragms, and strength evaluation methods including analytical and load testing approaches.<br /><br />The webinar also discusses items excluded from the code, future needs like service load combinations, resolution of conflicts with ASCE 7, and deferred research areas. Furthermore, relevant PCI standards related to fire resistance, glass-fiber-reinforced concrete panels, piles, and insulated wall panels are noted for reference.<br /><br />In conclusion, the ACI-PCI 319-25 signifies a major step in codifying best practices and updated technical provisions for precast concrete, ensuring greater clarity, safety, and regulatory acceptance for engineers and jurisdictions. The effort involved multiple committees, stakeholder collaboration, and extensive research, marking a new cycle of advancement for precast concrete design standards.

Keywords

ACI-PCI 319

Precast Concrete Code

Structural Precast Concrete

ACI 318

PCI Design Standard

Torsion Design

Seismic-Force-Resisting Systems

Precast Shear Walls

Load Testing Methods

Precast Concrete Standards