本研究建置了一套考慮鋼筋混凝土在受到鹽害情況下之側推耐震能力評估模型，並將鋼筋的腐蝕程度對結構桿件強度耐震能力的影響考慮進去。最後建立了鋼筋混凝土橋梁降伏及崩塌地表加速度與服務時間和腐蝕程度間之關係。本研究側推模式之特點有：1.考慮橋柱非線性行為：混凝土、鋼筋組成律非線性之行為。2.整體結構側力行為符合規範精神。3.考慮軸力變化影響。4.考慮鹽害對混凝土劣化的影響。5.建立劣化對保護層混凝土、核心混凝土、縱向鋼筋、橫向鋼筋、與握裹強度彼此之影響關係分析模式。6.考慮撓曲與剪力破壞包絡強度。7.側推分析模型程式化。根據本研究所建置之側推耐震能力評估模型，將台灣各種結構類型的橋梁進行分析研究結果顯示，橋梁在離海岸線0至6.5公里內，在其服務時間為2至32年時開始受到氯化物的腐蝕。因為，橋梁的服務壽命約為50，因此，在此服務期間內，離海岸線0至6.5公里內的橋樑，會受到鹽害的影響。研究結果也顯示，橋梁受到鹽害的影響，每10年橋梁的崩塌PGA值會降低約0.61%，其中0.61%為平均值。若再加上1至2個標準偏差後，其值約為0.81至1.01％。因此，我們建議在進行橋梁設計時，橋梁的設計崩塌PGA值需增加約4.05％至5.05％，以確保橋梁在50年服務壽命期間內有足夠的抗震性能，由其是離海岸線0至6.5公里內的橋樑。

This work presents a new seismic evaluation methodology for corroded reinforced concrete bridges based on nonlinear static pushover analysis. Corrosion of steel reinforcement by chloride attack is considered. At the material level, the effects of corrosion are considered by modeling the degradation of the mechanical properties of steel reinforcement, softening of cover concrete under compression, degradation of core concrete due to confinement steel corrosion, and reduction of bond strength between concrete and steel reinforcement. At the structural level, the effects of corrosion on both flexural behavior and shear behavior, and their interaction are considered.Eleven bridges of various structural types in Taiwan that are located within 6.5 km of their nearest coastline are analyzed to identify their long-term seismic performance. Relationships between the yield and collapsepeak groundaccelerations (PGAs), and service time and corrosion level are established for each bridge. Analysis results show that chloride corrosion starts in 2–32 years. The transverse steel reinforcement typically starts corroding before the longitudinal steel reinforcement, as the former has a thicker cover. Research results show that collapse PGA reduces by 0.81 or 1.01% per 10 years when the mean value plus 1 or2 standard deviation of the collapse PGA values are considered, respectively. Therefore, we suggest increasing the design PGA from 4.05% to 5.05% for a bridge adjacent to a coastline to ensure adequate long-term seismic performance for 50 years, the typicaldesign life span of a regular bridge.

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