Progressive Collapse of RC Box Girder Bridges due to Seismic Actions

Table 2

Bridge models and box girder reinforcements (unit: mm).

Model	Ground motion	Bridge system	Sec.	Reinforcement of the box girder				Reinforcement ratio (%)
				A	B	C	D
				Ø (mm)/spacing (mm)		No. of bars Ø (mm)
A1-M-K	Kobe	Monolithic	1	Ø16/125	Ø18/125	16Ø32	10Ø32	100
			2				34Ø32
A2-M-K	Kobe	Monolithic	1	Ø10/125	Ø10/125	16Ø18	10Ø18	35
			2				34Ø18
A3-M-K	Kobe	Monolithic	1	Ø10/125	Ø8/125	16Ø16	10Ø16	25
A3-M-C	Chi-Chi
A3-M-N	Northridge		2				34Ø16
A3-C-K	Kobe	Continuous	1	Ø10/125	Ø8/125	16Ø16	10Ø16
A3-C-C	Chi-Chi
A3-C-N	Northridge		2				34Ø16
A3-S-K	Kobe	Simple	1	Ø10/125	Ø8/125	30Ø16	10Ø16
A3-S-C	Chi-Chi
A3-S-N	Northridge

∗-M-∗: monolithic; ∗-C-∗: continuous; and∗-S-∗ simple bridges. ∗-∗-C: Chi-Chi; ∗-∗-K: Kobe; and ∗-∗-N: Northridge.