IAB Field Monitoring Paper

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

LaFave, J.M., Brambila, G., Kode, U., Liu, G. and Fahnestock, L.A. “Field Behavior of Integral Abutment Bridges under Thermal Loading,” Journal of Bridge Engineering, ASCE, April 2021, 26 (4): 04021013. dx.doi.org/10.1061/(ASCE)BE.1943-5592.0001677

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

Paper on Bolted Angle Connections

A new paper, which documents an extensive experimental program that was conducted to characterize the nonlinear response of bolted steel angles, is now available online:

Beland, T., Bradley, C.R., Nelson, J., Sizemore, J.G., Davaran, A., Tremblay, R., Hines, E.M. and Fahnestock, L.A. “Experimental parametric characterization of bolted angle connection behavior,” Journal of Structural Engineering, ASCE, August 2020, 146 (8): 04020160.  dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002662

Paper on Low-Ductility Braced Frames

A new paper on seismic performance of low-ductility braced frames is now available online in the ASCE Journal of Structural Engineering:

Sizemore, J.G., Fahnestock, L.A. and Hines, E.M. “Seismic Performance Assessment of Low-Ductility Braced Frames,” Journal of Structural Engineering, ASCE. dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002276

This paper complements a pair of earlier papers that examined fundamentals of system behavior through full-scale experiments and static numerical simulations:

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

Paper on seismic modeling of IABs

Now available online – paper on seismic modeling of integral abutment bridges:

Kozak, D.L., LaFave, J.M. and Fahnestock, L.A. “Seismic Modeling of Integral Abutment Bridges in Illinois,” Engineering Structures. dx.doi.org/10.1016/j.engstruct.2018.02.088

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

Fahnestock Presents at STESSA

Larry Fahnestock attended the international conference STESSA – Behavior of Steel Structures in Seismic Areas and presented the paper “Seismic Stability of Buckling-Restrained Braced Frames,” which was co-authored with former MS student Santiago Zaruma.  Santiago is now a practicing structural engineer with ADSTREN in Quito, Ecuador.  Robert Tremblay (Polytechnique Montreal) presented the paper “Contribution of Beam-Column Connections with Bolted Angles in the Reserve Capacity and Full-Scale Cyclic Testing,” which documents research that was part of an international collaborative project on seismic stability of low-ductility braced frames.  All papers presented at STESSA are published online at Scientific.Net.

Post-Earthquake Reconnaissance Paper

A pre-print of the following paper is now available online:

Andre R. BarbosaLarry A. FahnestockDamon R. FickDipendra GautamRajendra SotiRichard WoodBabak MoaveniAndreas Stavridis, Michael J. Olsen and Hugo Rodrigues

https://doi.org/10.1193/051017EQS087M

This paper will be part of the forthcoming EERI Spectra Special Issue on the 2015 Gorkha Nepal Earthquake.

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