Experimental Study of Composite Members in Spatial Grid Structure Subjected to Ultralow-Cyclic Axial Force

Figure 17

Damage index comparison. (a) Loading system I. (b) Loading system II. (c) Loading system III. (d) Loading system IV. (e) Loading system V. (f) Loading system VI.

(a)

(b)

(c)

(d)

(e)

(f)