Longitudinal Seismic Behavior of a Single-Tower Cable-Stayed Bridge Subjected to Near-Field Earthquakes

Table 6

Observed damage during the test.

PGA	Damage height	description
0–0.25 g	—	No damage.
0.30 g	= 0.65 m	First crack appeared at the bottom of tower leg.
0.30~0.50 g	= 0.65 m	First crack extended to gradually form a circle.
	= 0.80~1.20 m	Several parallel cracks appeared just above the first crack.
	= 0.80~1.20 m	Cracks extended horizontally.
0.6~0.70 g	= 1.4 m~3.5 m	Several parallel cracks appeared and were distributed in parallel at a nearly equal distance of tower width (around 0.35 m).
	= 5.8 m	Cracks appeared at top tower 0.2 m above the section where two skewed legs intersect (Section C-C in Figure 3).
0.75 g	= 5.8 m	Cracks extended and penetrated Section C-C.
0.80 g	= 5.8 m	Considerable concrete spalling and exposed longitudinal bars were observed at Section C-C.