CAJ | 학술논문

针对预应力混凝土桥因耐久性或承载能力无法达到要求而寿命终结，为对其耐久性和安全性进行有效评估，基于抗力衰减和可靠度理论建立预应力混凝土桥使用寿命预测方法。该方法考虑混凝土碳化、钢筋锈蚀、预应力损失和荷载效应等因素，依据设计规范，以临界可靠指标的形式给出预应力混凝土桥碳化寿命、锈胀开裂寿命和承载能力寿命终结的判定标准，得出碳化寿命、锈胀开裂寿命和抗弯承载能力寿命的极限状态方程，对桥梁的使用寿命进行预测。采用该方法对某新建预应力混凝土梁桥的碳化寿命、锈胀开裂寿命和承载能力寿命进行预测。理论研究和应用结果表明，在一般大气环境及正常养护和运营条件下，该桥耐久性和承载能力在设计基准期内满足要求，并根据预测结果给出运营过程中检测周期的建议；该方法可有效评估预应力混凝土桥使用寿命。
침대예응력혼응토교인내구성혹승재능력무법체도요구이수명종결，위대기내구성화안전성진행유효평고，기우항력쇠감화가고도이론건립예응력혼응토교사용수명예측방법。해방법고필혼응토탄화、강근수식、예응력손실화하재효응등인소，의거설계규범，이림계가고지표적형식급출예응력혼응토교탄화수명、수창개렬수명화승재능력수명종결적판정표준，득출탄화수명、수창개렬수명화항만승재능력수명적겁한상태방정，대교량적사용수명진행예측。채용해방법대모신건예응력혼응토량교적탄화수명、수창개렬수명화승재능력수명진행예측。이론연구화응용결과표명，재일반대기배경급정상양호화운영조건하，해교내구성화승재능력재설계기준기내만족요구，병근거예측결과급출운영과정중검측주기적건의；해방법가유효평고예응력혼응토교사용수명。
The prestressed concrete bridge would be deficient due to the insufficient durability or scarce load bearing capacity .To effectively evaluate its durability and safety ,a service life eval‐uating method based on resistance attenuation and probability theory for prestressed concrete bridge is put forward ,in which the factors ,like concrete carbonization ,reinforcement corrosion , prestress loss and load effect are counted .T he judging criteria for the concrete carbonization life , corrosion expansion cracking life and expiration of load bearing life of a prestressed concrete bridge are given by way of critical probability index ,and the ultimate state equations of carbonization life , corrosion expansion cracking life and anti‐bending load bearing life are gained . T he method has been used to the evaluation of the carbonization life ,corrosion expansion cracking life and load bearing life of a newly‐built prestressed concrete bridge .The results of the study and application demonstrate that in the common atmospheric environment and under normal maintenance and oper‐ation condition ,the durability and load bearing capacity of the bridge in the design reference period meet the requirements ,the inspection schedule during the operation process is proposed according to the results . T his method can effectively evaluate the service life of the prestressed concrete bridge .