Education

Research Description

Dr. Zia is interested in behavior and design of reinforced and prestressed concrete structures, high-performance concrete, high-strength steel, bridge engineering.

Honors and Awards

• National Academy of Engineering, 1983
• National Park Service Citizen's Award for Exceptional Service, 1999
• NCSU Alexander Quarles Holladay Medal of Excellence, 1993
• ASEE Lamme Medal, 1986
• NCSU Alcoa Foundation Distinguished Engineering Research Award, 1980

Publications

Thermal cracking of mass concrete bridge footings in coastal environments

Bobko, C. P., Edwards, A. J., Seracino, R., & Zia, P. (2015), Journal of Performance of Constructed Facilities, 29(6).

Effects of production practices on camber of prestressed concrete bridge girders Response

Storm, T. K., Rizkalla, S. H., & Zia, P. Z. (2013), PCI Journal, 143–144.

Development of a rational design methodology for precast concrete slender spandrel beams

Klein, G., Rizkalla, S., Zia, P., & Lucier, G. (2012), PCI Journal, 182–186.

Development of a rational design methodology for precast concrete slender spandrel beams: Part 2, analysis and design guidelines

Lucier, G., Walter, C., Rizkalla, S., Zia, P., & Klein, G. (2011), PCI Journal, 106–133. https://doi.org/10.15554/pcij.09012011.106.133

Behavior of instrumented prestressed high performance concrete bridge girders

Dwairi, H. M., Wagner, M. C., Kowalsky, M. J., & Zia, P. (2010), CONSTRUCTION AND BUILDING MATERIALS, 24(11), 2294–2311. https://doi.org/10.1016/j.conbuildmat.2010.04.026

behavior of concrete beams reinforced with ASTM A1035 grade 100 stirrups under shear

Munikrishna, A., Hosny, A., Rizkalla, S., & Zia, P. (2010), ACI Structural Journal, 108(1), 34–41.

Behavior of high-performance steel as shear reinforcement for concrete beams

Sumpter, M. S., Rizkalla, S. H., & Zia, P. (2009), ACI Structural Journal, 106(2), 171–177.

Bond characteristics of ASTM A1035 steel reinforcing bars

Seliem, H. M., Hosny, A., Rizkalla, S., Zia, P., Briggs, M., Miller, S., … Jirsa, J. O. (2009), ACI Structural Journal, 106(4), 530–539.

Proposal for concrete compressive strength up to 18 ksi (124 Mpa) for bridge design

Rizkalla, S., Zia, P., Mirmiran, A., Russell, H. G., & Mast, R. (2009), Transportation Research Record, (2131), 59–67.

Short-term mechanical properties of high-strength concrete

Logan, A., Choi, W., Mirmiran, A., Rizkalla, S., & Zia, P. (2009), ACI Materials Journal, 106(5), 413–418.

View all publications via NC State Libraries

Grants

Predicting Camber, Deflection & Prestess Losses of Prestressed Concrete Members

NC Department of Transportation(8/16/09 - 3/31/11)

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Predicting Camber, Deflection & Prestess Losses of Prestressed Concrete Members

Sponsor: NC Department of Transportation

Start Date: 8/16/09

End Date: 3/31/11

Abstract

This proposal is developed in response to research idea 0403 on the NCDOT list of research ideas for AY 2010. The models currently used by NCDOT to calculate long-term prestress losses, camber and deflection of prestressed concrete girders, box beams, and cored slabs may be out of date. The objective of the proposed project is to evaluate the effectiveness of the current NCDOT methodologies to predict prestress losses, camber and deflection of prestressed concrete members in light of the recent development of using longer spans of bulb-tee girders and box beams as well as higher concrete strengths in the range of 8000 psi to 12,000 psi. The different tasks considered in this project include an evaluation of the current NCDOT models and other existing models including AASHTO LRFD Specifications. One of the major tasks of the project is to establish an extensive database of measured cambers and deflections of prestressed bridge girders used in recent and future projects in collaboration with NCDOT personnel in order to evaluate and calibrate the different models including conspan program. Based on the findings of the evaluation, a refined and more reliable model will be recommended for implementation by NCDOT. The project will provide the Structure Design Unit with a reliable and calibrated model for the design of prestressed concrete members and for predictions of deflections during and after construction. The duration of the proposed project is one year.

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Application of the LRFD Bridge Design Specifications to High-Strength Structural Concrete: Flexure and Compression Provisions

National Academy of Sciences(8/15/03 - 5/28/07)

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Application of the LRFD Bridge Design Specifications to High-Strength Structural Concrete: Flexure and Compression Provisions

Sponsor: National Academy of Sciences

Start Date: 8/15/03

End Date: 5/28/07

Abstract

The objective of this research is to develop recommended revisions to the AASHTO LRFD Bridge Design Specifications to extend the applicability of the flexural and compression design provisions to concrete up to 18 ksi. The research results will allow full utilization of the material characteristics and greater use of high-strength concrete, since the current LRFD limits the design strength of the ultimate compressive strength of concrete to 69 MPa (10 ksi). The results will have great economical advantages by allowing bridge design engineers to design AASHTO girders more effectively in terms of the thickness of the web and larger beam spacing.

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