Paper on Frame-Spine-FLC Testing at E-Defense

In December 2020 – as part of the NSF-funded project “Collaborative Research: Frame-Spine System with Force-Limiting Connections for Low-Damage Seismic-Resilient Buildings” –  researchers from the University of Illinois, Lehigh University, Oregon State University, Kyoto University, Hokkaido University and E-Defense conducted full-scale building earthquake simulations on the shake table at the Hyogo Earthquake Engineering Research Center (E-Defense).  The four-story building employed a novel low-damage structural system and the building was furnished with hospital fixtures and equipment to evaluate protection of occupants and building contents.  The testing program concluded on December 17 with an earthquake simulation using an input acceleration record from the 1995 Kobe Earthquake (100% JMA Kobe video linked).  A paper that provides an overview of the testing program was presented at the 17th World Conference on Earthquake Engineering:

Fahnestock, L., Sause, R., Simpson, B., Ricles, J., Kurata, M., Okazaki, T., Kawamata, Y., Tao, Z., Duke, J., Rivera, D., Astudillo, B. and Qie, Y. “U.S.-Japan Collaboration for Shake Table Testing of a Frame-Spine System with Force-Limiting Connections,” Paper No. C004765, 17th World Conference on Earthquake Engineering, Sendai, Japan.

Papers on Low-Ductility CBFs

Two new papers on seismic behavior and design of low-ductility concentrically-braced frames are now in print:

Bradley, C.R., Hines, E.M. and Fahnestock, L.A. “Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity,” Journal of Structural Engineering, ASCE, August 2021, 147 (8): 04021116. dx.doi.org/10.1061/(ASCE)ST.1943-541X.0003047

Bradley, C.R., Fahnestock, L.A. and Hines, E.M. “Dual System Design for a Low-Ductility Concentrically Braced Frame with a Reserve Moment Frame,” Structures, December 2021, 34: 3315-3328. dx.doi.org/10.1016/j.istruc.2021.09.009

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.