Life-Cycle Seismic Fragility Assessment of Existing RC Bridges Subject to Chloride-Induced Corrosion in Marine Environment

Table 2

Time-dependent material properties under four categories of exposure conditions.

Material parameters	0	20	40	60	80	100
Tidal zone
Yield strength of longitudinal reinforcement	335	332	319	288	267	252
Compressive strength of unconfined concrete	30.0	20.4	12.8	8.7	6.3	4.7
Compressive strength of confined concrete	37.5	34.0	32.8	31.9	31.5	31.3
Ultimate strain of confined concrete	0.0116	0.0077	0.0061	0.0052	0.0048	0.0047
Submerged zone
Yield strength of longitudinal reinforcement	335	335	331	322	308	291
Compressive strength of unconfined concrete	30.0	28.7	23.6	18.7	14.7	11.7
Compressive strength of confined concrete	37.5	34.7	34.0	33.3	32.6	32.1
Ultimate strain of confined concrete	0.0116	0.0087	0.0076	0.0066	0.0059	0.0054
Atmospheric zone
Yield strength of longitudinal reinforcement	335	334	330	320	306	289
Compressive strength of unconfined concrete	30.0	28.1	22.9	18.6	15.1	12.3
Compressive strength of confined concrete	37.5	34.6	34.0	33.3	32.7	32.2
Ultimate strain of confined concrete	0.0116	0.0087	0.0076	0.0067	0.0060	0.0055
Splash zone
Yield strength of longitudinal reinforcement	335	334	330	320	305	287
Compressive strength of unconfined concrete	30.0	28.1	22.7	17.7	13.9	11.1
Compressive strength of confined concrete	37.5	34.6	33.9	33.0	32.4	32.0
Ultimate strain of confined concrete	0.0116	0.0086	0.0074	0.0064	0.0057	0.0053