by Anil K. Chopra, Rakesh K. Goel, and Juan Carlos De la Llera
Chopra, Anil K., Rakesh K. Goel, and Juan Carlos De la Llera (1998). Seismic Code Improvements Based on Recorded Motions of Buildings During Earthquakes. SMIP98
Seminar on Utilization of Strong-Motion Data, p. 135 - 154.
Click on the link below for the full text:
Summarized in this paper are the results of two recent investigations utilizing recorded motions of buildings to
develop improvements in two aspects of seismic code provisions for buildings: (1) fundamental vibration period
formulas, and (2) accidental torsion.