Shaking-table data for a tuned liquid damper with a sloped bottom of 30 • with the horizontal are investigated using a non-linear numerical model previously developed by Yu, Jin-kyu, Nonlinear characteristics of tuned liquid dampers. Ph.D. Thesis, Department of Civil Engineering, University of Washington, Seattle, WA, 98195 (1997). Sti ness and damping parameters for this model are obtained and compared with those previously derived for box-shaped tanks. The values for these parameters re ect the softening spring behaviour of the sloped-bottom system in contrast to the hardening system evident for the boxshaped TLD. Consequently, the sloped-bottom tank should be tuned slightly higher than the fundamental structural frequency in order to obtain the most e ective damping.