Central Chapter Dinner Meeting:
Coordination Details Between the EOR and the Precast Designer
Camber/Topping/Drainage/Bottom Tensile Stress Interaction
Investigate the impact of placing restrictions on the bottom tensile stress of prestress member and the interrelationship that has on camber, topping thickness, and drainage in a prestress parking deck. A review of bottom tensile stress limits per ACI 318 and code prescribed stress limitations.
Holes in Prestressed Beams
One technique to leverage smaller structural depths or plenum space is through the use of holes in inverted tee beams between double tee stems. A brief review of the statics under construction loading, service loading, and ultimate loading. Rational design methods are presented for distribution of prestress, shear, torsion, and moment.
ASCE 7-16 Adoption of PCI Diaphragm Research
ASCE 7-10 has been modified and updated to ASCE 7-16 and includes a new section, 12.10.3, Alternative Design Provisions for Diaphragms including Chords and Collectors, within the Diaphragm Chords and Collectors section, 12.10. This new section provides for an alternative determination of diaphragm design force level, which is mandatory for precast concrete diaphragms in buildings assigned to SDC D, D, E, or F.
Jason P. Lien P.E., FPCI,
Executive Vice President at EnCon United, Denver Colorado
Jason is Executive Vice President of EnCon United, a corporate holding company of five precast concrete manufacturing plants spread across the United States, including Tpac located in Phoenix, Arizona. He has over 20 years of experience in the design, manufacture, and delivery of precast concrete systems. Jason formed and oversees EnCon’s engineering division, EnCon Design, LLC, a design firm specializing in manufactured concrete products, as well as EnCon’s construction division, EnCon Construction, LLC which focuses on concrete repair, concrete restoration, tilt-up, and general contracting.
Jason is one of the youngest recipients to be elected as a Fellow of Precast/Prestressed Concrete Institute. He is a two-time Leslie D. Martin Award of Merit winner and served for 8 years on the Institutes’ Technical Activities Committee (TAC) supporting the technical advancement of precast/prestressed concrete. Other appointments include active participation on the PCI Design Handbook Committee, both 6th and 7th Design Handbook editions. Jason is currently serving his third year as a member of the Marketing Activities Council for PCI. He has presented over 50 seminars related to the design and use of precast concrete.
Previously, Jason was President of StructureWorks, a software development company specializing in an enterprise 3D design and drawing automation application, built on the SolidWorks modeling platform and Microsoft SQL.
He holds a BS and MS in Engineering Systems for the Colorado School of Mines in Golden, Colorado. Jason is a registered Professional Civil Engineer in Colorado, California, New Mexico, Wyoming, Georgia, and the Territory of Guam.
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