建筑科学与工程学报
建築科學與工程學報
건축과학여공정학보
Journal of Architecture and Civil Engineering
2015年
5期
56-64
,共9页
桥梁工程%氯离子侵蚀%抗震性能%材料退化%RC桥墩
橋樑工程%氯離子侵蝕%抗震性能%材料退化%RC橋墩
교량공정%록리자침식%항진성능%재료퇴화%RC교돈
bridge engineering%chloride ion corrosion%seismic performance%material deteriora-tion%reinforced concrete pier
为研究混凝土桥梁结构在服役期内由于环境氯离子侵蚀效应引起钢筋、混凝土锈蚀退化等导致结构抗震性能退化的规律，以某多跨钢筋混凝土连续梁桥为例，采用OpenSees软件建立非线性动力分析模型，根据已有研究成果并基于概率方法研究了墩柱截面主筋和箍筋锈蚀的开始时间和锈蚀率大小，进而建立了钢筋的直径及屈服强度退化模型；针对考虑纵筋锈蚀、考虑箍筋锈蚀、同时考虑纵筋和箍筋锈蚀3种情况，分别分析了材料退化对桥墩抗震性能的影响。结果表明：同等条件下箍筋锈蚀比纵筋锈蚀更早；随着时间的推移，氯离子侵蚀效应会导致桥墩抗震能力下降，结构的抗震需求明显增加；与以往只考虑纵筋锈蚀的情况相比，同时考虑箍筋和纵筋锈蚀时桥墩抗震性能退化更严重。
為研究混凝土橋樑結構在服役期內由于環境氯離子侵蝕效應引起鋼觔、混凝土鏽蝕退化等導緻結構抗震性能退化的規律，以某多跨鋼觔混凝土連續樑橋為例，採用OpenSees軟件建立非線性動力分析模型，根據已有研究成果併基于概率方法研究瞭墩柱截麵主觔和箍觔鏽蝕的開始時間和鏽蝕率大小，進而建立瞭鋼觔的直徑及屈服彊度退化模型；針對攷慮縱觔鏽蝕、攷慮箍觔鏽蝕、同時攷慮縱觔和箍觔鏽蝕3種情況，分彆分析瞭材料退化對橋墩抗震性能的影響。結果錶明：同等條件下箍觔鏽蝕比縱觔鏽蝕更早；隨著時間的推移，氯離子侵蝕效應會導緻橋墩抗震能力下降，結構的抗震需求明顯增加；與以往隻攷慮縱觔鏽蝕的情況相比，同時攷慮箍觔和縱觔鏽蝕時橋墩抗震性能退化更嚴重。
위연구혼응토교량결구재복역기내유우배경록리자침식효응인기강근、혼응토수식퇴화등도치결구항진성능퇴화적규률，이모다과강근혼응토련속량교위례，채용OpenSees연건건립비선성동력분석모형，근거이유연구성과병기우개솔방법연구료돈주절면주근화고근수식적개시시간화수식솔대소，진이건립료강근적직경급굴복강도퇴화모형；침대고필종근수식、고필고근수식、동시고필종근화고근수식3충정황，분별분석료재료퇴화대교돈항진성능적영향。결과표명：동등조건하고근수식비종근수식경조；수착시간적추이，록리자침식효응회도치교돈항진능력하강，결구적항진수구명현증가；여이왕지고필종근수식적정황상비，동시고필고근화종근수식시교돈항진성능퇴화경엄중。
In order to study the deterioration law of seismic performance for concrete bridges which was caused by chloride ion corrosion on steel and concrete during the bridge's service life , a multi‐span reinforced concrete (RC) continuous girder bridge was taken as an example .The nonlinear dynamic analysis model was established by OpenSees software .Based on the previous researches ,the probabilistic analysis method was applied to investigate the initial corrosion time and corrosion rate of the main reinforcement of pier column section and stirrup . Then the deterioration models of the diameter and yield strength of steel were established .Three typical analysis cases , consisting of longitudinal reinforcement corrosion , stirrup corrosion and the combination corrosion of longitudinal reinforcement and stirrup ,were investigated to study the effects of material deterioration on the seismic performance of RC piers .The results show that the initial corrosion time of stirrups is earlier than that of longitudinal reinforcements under the same conditions .T he chloride ion corrosion effect can cause the deterioration of seismic capacity for the RC piers as time goes on ,and the seismic demands will increase obviously .Compared with only considering the corrosion situation of longitudinal reinforcement in the past , the deterioration of seismic performance is more serious w hen the stirrups and longitudinal reinforcement corrosion are both considered .
