Base Isolation of Buildings with Curved Surface Sliders: Basic Design Criteria and Critical Issues

Table 3

Five columns frame: characteristics of the four perimetral isolators.

Friction coefficient	μ	1.5 μ	2.5 μ
Secant stiffness Ke(kN/m)	379.2	238.1	307.6
Elastic shear stiffness k (kN/m)	11438.2	7181.2	9275.7
Equivalent period Tis (s)	3.26	3.01	2.65