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