Ground Motions for Southern Illinois

A new paper and companion report document the development of ground motions for Central North America.  These ground motions are being used in ongoing research to conduct dynamic structural analysis of bridges in Southern Illinois.

  • Kozak, D.L., Luo, J., Olson, S.M., LaFave, J.M. and Fahnestock, L.A. “Modification of ground motions for use in Central North America,” Journal of Earthquake Engineering (accepted July 26, 2017). dx.doi.org/10.1080/13632469.2017.1387190
  • Kozak, D.L., Luo, J., Olson, S.M., LaFave, J.M., Fahnestock, L.A. “Modification of ground motions for use in Central North America: Southern Illinois surface ground motions for structural analysis,” Newmark Structural Engineering Report Series, No. 48, University of Illinois at Urbana-Champaign, September 2017. http://hdl.handle.net/2142/98456

The ground motions can be downloaded from the Illinois Data Bank:

  • Kozak, Derek L.; Luo, Jie; Olson, Scott M.; LaFave, James M.; Fahnestock, Larry A. (2017): Data from Modification of ground motions for use in Central North America: Southern Illinois surface ground motions for structural analysis. University of Illinois at Urbana-Champaign. https://doi.org/10.13012/B2IDB-9696589_V1

The work described in these documents is part of the project Calibration and Refinement of Illinois’ Earthquake Resisting System Bridge Design Methodology: Phase II, which is sponsored by the Illinois Center for Transportation.

New Bridge Bearing Paper Published Online

A new paper on elastomeric bearings with side retainers has been published in the Journal of Bridge Engineering:

  • Steelman, J.S., Fahnestock, L.A., Hajjar, J.F. and LaFave, J.M. “Cyclic Experimental Behavior of Nonseismic Elastomeric Bearings with Stiffened Angle Side Retainer Fuses for Quasi-Isolated Seismic Bridge Response,” Journal of Bridge Engineering, ASCE, 23 (1), January 2018. doi.org/10.1061/(ASCE)BE.1943-5592.0001170

The work described in this paper was conducted as part of the project Calibration and Refinement of Illinois’ Earthquake Resisting System Bridge Design Methodology and was sponsored by the Illinois Center for Transportation. It accompanies three earlier papers, and together they comprehensively characterize cyclic behavior of expansion bearings that are used extensively in Illinois’ bridges:

  • Steelman, J.S., Fahnestock, L.A., Filipov, E.T., LaFave, J.M., Hajjar, J.F. and Foutch, D.A. “Shear and Friction Response of Non-Seismic Laminated Elastomeric Bridge Bearings Subject to Seismic Demands,” Journal of Bridge Engineering, ASCE, 18 (7): 612-623, (2013). dx.doi.org/doi:10.1061/(ASCE)BE.1943-5592.0000406
  • Steelman, J.S., Filipov, E.T., Fahnestock, L.A., Revell, J.R., LaFave, J.M., Hajjar, J.F. and Foutch, D.A. “Experimental Behavior of Steel Fixed Bearings and Implications for Seismic Bridge Response,” Journal of Bridge Engineering, ASCE, 19 (8) 2014. dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000540
  • Steelman, J.S., Fahnestock, L.A., Hajjar, J.F. and LaFave, J.M. “Performance of Non-Seismic PTFE Sliding Bearings when Subjected to Seismic Demands,” Journal of Bridge Engineering, ASCE, 21 (1) 2016, 04015028. dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000777

Best Paper Award

The paper “I-5 Skagit River Bridge Collapse Review” has been selected as the best paper for 2016 by vote of the Associate Editors of the ASCE Journal of Performance of Constructed Facilities.

Stark, T.D., Benekohal, R., Fahnestock, L.A., LaFave, J.M., He, J. and Wittenkeller, C. “I-5 Skagit River Bridge Collapse Review,” Journal of Performance of Constructed Facilities, ASCE, 04016061.  dx.doi.org/10.1061/(ASCE)CF.1943-5509.0000913

Papers on Coupled Steel Shear Walls

Two new papers on seismic behavior of coupled steel plate shear walls are now available:

Borello, D.J. and Fahnestock, L.A. “Large-Scale Cyclic Testing of Steel Plate Shear Walls with Coupling,” Journal of Structural Engineering, ASCE, 143 (10) 04017133. doi.org/10.1061/(ASCE)ST.1943-541X.0001861

Wang, M., Borello, D. and Fahnestock, L.A. “Boundary Frame Contribution in Coupled and Uncoupled Steel Plate Shear Walls,” Earthquake Engineering and Structural Dynamics. dx.doi.org/10.1002/eqe.2908

Papers on Low-Ductility Braced Frames

Two new papers on seismic behavior of low-ductility braced frames are now available in the “Just Released” online section of the ASCE Journal of Structural Engineering:

Bradley, C.R., Fahnestock, L.A., Hines, E.M. and Sizemore, J.G. “Full-Scale Cyclic Testing of Low-Ductility Concentrically-Braced Frames,” Journal of Structural Engineering, ASCE. dx.doi.org/10.1061/(ASCE)ST.1943-541X.0001760

Sizemore, J.G., Fahnestock, L.A., Hines, E.M. and Bradley, C.R. “Parametric Study of Low-Ductility Concentrically-Braced Frames under Cyclic Static Loading,” Journal of Structural Engineering, ASCE. dx.doi.org/10.1061/(ASCE)ST.1943-541X.0001761

Bridge Collapse Review Paper Published

A new paper on the collapse of a span in the I-5 Skagit River Bridge, which occurred due to a vehicle strike, is now available in the ASCE Journal of Performance of Constructed Facilities:

Stark, T., Benekohal, R., Fahnestock, L., LaFave, J., He, J., and Wittenkeller, C. (2016). “I-5 Skagit River Bridge Collapse Review.” J. Perform. Constr. Facil. , 10.1061/(ASCE)CF.1943-5509.0000913, 04016061.

Illinois News Bureau Release

Papers on Multitiered Braced Frames

Two new papers on seismic behavior and design of multitiered braced frames are now available in the “Just Released” online section of the ASCE Journal of Structural Engineering:

Imanpour, A., Tremblay, R., Davaran, A., Stoakes, C., and Fahnestock, L. (2016). “Seismic Performance Assessment of Multitiered Steel Concentrically Braced Frames Designed in Accordance with the 2010 AISC Seismic Provisions.” J. Struct. Eng.10.1061/(ASCE)ST.1943-541X.0001561, 04016135.

Imanpour, A., Tremblay, R., Fahnestock, L., and Stoakes, C. (2016). “Analysis and Design of Two-Tiered Steel Braced Frames under In-Plane Seismic Demand.” J. Struct. Eng.10.1061/(ASCE)ST.1943-541X.0001568, 04016115.

Paper on Seismic Modeling of Seat-Type Abutment Bridges

A new paper is now available on modeling and seismic analysis of seat-type abutment bridges, with focus on Illinois and the quasi-isolated design philosophy that has been adopted by the Illinois Department of Transportation:

Luo, J., Fahnestock, L.A., Kozak, D.L. and LaFave, J.M. “Seismic analysis incorporating detailed structure-abutment-foundation interaction for quasi-isolated highway bridges,” Structure and Infrastructure Engineeringdx.doi.org/10.1080/15732479.2016.1177094

The work described in this paper is part of the project Calibration and Refinement of Illinois’ Earthquake Resisting System Bridge Design Methodology: Phase II, which is sponsored by the Illinois Center for Transportation.

Integral Abutment Bridge Analysis Paper Published

A paper on behavior of integral abutment bridges has been published in the ASCE Journal of Bridge Engineering:

LaFave, J., Riddle, J., Jarrett, M., Wright, B., Svatora, J., An, H., and Fahnestock, L. (2016). “Numerical Simulations of Steel Integral Abutment Bridges under Thermal Loading.” J. Bridge Eng., 10.1061/(ASCE)BE.1943-5592.0000919, 04016061.

The work described in this paper is part of the project Analysis of Superstructures of Integral Abutment Bridges, which is sponsored by the Illinois Center for Transportation and the Illinois Tollway.

Moderate Seismic Design Article Published

A new article “Ductility in Moderation” is published in the February 2016 issue of Modern Steel Construction.  Research described in this article is part of the project NEESR: Reserve Capacity in New and Existing Low-Ductility Steel Braced Frames, and is also partially supported by the American Institute of Steel Construction.

Modern Steel Construction, Februrary 2016

Hines, E.M and Fahnestock, L.A. “Ductility in Moderation,” Modern Steel Construction, American Institute of Steel Construction, February 2016, pp. 32-37.