Seismic Behavior of Box Steel Bridge Pier with Built-In Energy Dissipation Steel Plates

Table 4

Displacement ductility coefficient.

Specimens		Yielding points		Maximum points		Ultimate points		Ratio of ultimate to yielding μ
No.	Loading direction	(mm)	θy	δmax (mm)	θmax	δu (mm)	θu
I-0	Positive	10.50	1/190	41.90	1/48	63.32	1/32	6.03
	Negative	−10.50	1/190	−53.53	1/37	−63.40	1/32	6.04
II-1	Positive	10.50	1/190	52.52	1/38	52.52	1/36	5.00
	Negative	−10.50	1/190	−52.63	1/38	−52.56	1/38	5.01
II-2	Positive	10.50	1/190	52.20	1/38	52.78	1/38	5.03
	Negative	−10.50	1/190	−51.71	1/39	−52.62	1/38	5.01
III-1	Positive	10.50	1/190	52.34	1/38	62.99	1/32	6.00
	Negative	−10.50	1/190	−53.12	1/38	−63.03	1/32	6.00
III-2	Positive	11.82	1/169	47.20	1/42	59.18	1/34	5.01
	Negative	−11.82	1/169	−47.43	1/42	−59.12	1/34	5.00
III-3	Positive	9.85	1/203	37.57	1/53	49.66	1/40	5.04
	Negative	−9.85	1/203	−49.13	1/41	−49.14	1/40	4.99

Note. θ_y = /L₁; θ_u = δ_u/L₁; L₁ is shown in Figure 2(a).