TY - RPRT TI - Guidelines for nonlinear structural analysis and design of buildings. part IIa - steel moment frames PY - 2017 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST GCR 17-917-46v2 DO - 10.6028/NIST.GCR.17-917-46v2 ER -