Title: Ductile Connectors for a Precast Concrete Frame
Date: September-October, 1994
Volume: 39
Issue: 5
Page number: 46-59
Author(s): Suzanne Dow Nakaki, Robert E. Englekirk, Juergen L. Plaehn

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A precast concrete ductile frame system is presented that takes advantage of the inherent discrete nature of precast concrete by providing ductile links in the connections. These ductile connectors contain  a rod that yields at a welldefined strength, effectively limiting the load that can be transferred to less ductile components of the frame. The ductile connectors also transfer all vertical shear forces,  eliminating the need for corbels. High strength [150 ksi (1 034 MPa)] reinforcing steel is used in the beams to reduce congestion. A building designed for Uniform  Building Code Seismic Zone 2A is presented;however, the system is versatile and can be used in all seismic zones. 


1. International Conference of Building Officials, Uniform Building Code, Whittier, CA: ICBO, 1994.

2. Ochs, Jay E., and Ehsani, Mohammad R., "Moment Resistant Connections in Precast Concrete Frames for Seismic Regions," PCI JOURNAL, V. 38, No. 5, September-October  1993, pp. 64-75.

3. French, C. W., Hafner, M., and Jayashankar, V., "Connections Between  Precast Elements - Failure Within Connection Region," Journal of Structural Engineering, American Society of Civil  Engineers, V. 115, No. 12, December 1989, pp. 3171-3192.

4. Englekirk, Robert E., "Seismic Design Considerations for Precast Concrete Multistory Buildings," PCI JOURNAL, V. 35, No. 3, May-June 1990, pp. 40-51.

5. Martin, Leslie D., and Korkosz, W. J., "Connections for Precast Prestressed Concrete Buildings - Including Earthquake Resistance," Technical Report  No. 2, Precast/Prestressed Concrete Institute,  Chicago, IL, 1982.

6. Yee, Alfred A., "Design Considerations for Precast Prestressed Concrete Building Structures in Seismic Areas," PCI JOURNAL, V. 36, No. 3, MayJune  1991, pp. 40-55.

7. Englehardt, M. D., and Husain, A. S., "Cyclic-Loading Performance of Welded Flange- Bolted Web Connections,"  Journal of Structural Engineering, American Society of Civil Engineers, V. 119, No. 12, December 1993,pp. 3537-3550.

8. AISC Special Task Committee on the Northridge Earthquake, "Assessing Steel Damage in the Northridge Earthquake," Modern Steel Construction, May 1994, pp. 14-18.

9. Nakaki, Suzanne Dow, and Englekirk, Robert E., "PRESSS Industry Seismic  Workshops: Concept Development,"PCI JOURNAL, V. 36, No.5, September-  October 1991, pp. 54-61.

10. Paulay, T., and Priestley, M. J. N., Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley & Sons, New York, NY, 1992.

11. Priestley, M. J. N. (Editor), "Report on the Third U.S. PRESSS Coordinating Meeting," Report No. PRESSS 92/02, Department of Applied Mechanics and Engineering Sciences, University of California at San Diego, La Jolla, CA, August 1992, pp. 12-16. 

12. Cheok, G. S., and Lew, H. S., "Performance of Precast Concrete Beam-to-Column Connections Subject to Cyclic  Loading," PCI JOURNAL, V. 36, No.3, May-June 1991, pp. 56-67.

13. International Conference of Building Officials, Uniform Building Code,  Whittier, CA: ICBO, 1988.