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.
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
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.
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
A new paper on full-scale testing of steel gravity connections is now available online:
Beland, T., Tremblay, R., Hines, E.M. and Fahnestock, L.A. “Rotational Capacity of Bolted Double-Web-Angle Beam-Column Gravity Connections through Full-Scale Experimental Testing,” Journal of Structural Engineering, ASCE, July 2020, 146 (7): 04020111. dx.doi.org/10.1061/(ASCE)ST.1943-541X.0002661
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
A new paper on seismic stability of buckling-restrained braced frames is now available online:
Zaruma, S. and Fahnestock, L.A. “Assessment of design parameters influencing collapse performance of buckling-restrained braced frames,” Soil Dynamics and Earthquake Engineering , 113 (2018) 35-46. dx.doi.org/10.1016/j.soildyn.2018.05.021
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.
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.
A pre-print of the following paper is now available online:
This paper will be part of the forthcoming EERI Spectra Special Issue on the 2015 Gorkha Nepal Earthquake.