CAJ | 학술논문

为建立基于可靠性的在役T形截面简支粱桥抗剪承载力临界寿命曲线,并提出相应的受剪承载力剩余寿命实用预测方法,以设计目标可靠指标降低0.5为受弯构件抗剪承载能力最低可靠指标.在引入抗力简单随机过程模型的基础上,通过计算不同评估基准期与最低可靠指标时应的构件抗力相对折减系数限值,建立了基于抗力折减系数限值的受弯构件抗剪承栽能力临界寿命曲线和预测方法.最后,以某20 m简支T形梁桥为例进行抗剪承载力寿命预测,计算结果表明,本文提出的抗剪承载力寿命预测方法简单实用,与基于可靠度的在役桥梁承载能力剩余寿命预测方法是等效的,避免了寿命预测中复杂的可靠指标计算过程,可用于在役桥梁受弯构件抗剪承载力寿命预测.
위건립기우가고성적재역T형절면간지량교항전승재력림계수명곡선,병제출상응적수전승재력잉여수명실용예측방법,이설계목표가고지표강저0.5위수만구건항전승재능력최저가고지표.재인입항력간단수궤과정모형적기출상,통과계산불동평고기준기여최저가고지표시응적구건항력상대절감계수한치,건립료기우항력절감계수한치적수만구건항전승재능력림계수명곡선화예측방법.최후,이모20 m간지T형량교위례진행항전승재력수명예측,계산결과표명,본문제출적항전승재력수명예측방법간단실용,여기우가고도적재역교량승재능력잉여수명예측방법시등효적,피면료수명예측중복잡적가고지표계산과정,가용우재역교량수만구건항전승재력수명예측.
In order to establish reliability-based critical life curve of shear capacity and develop a practical method to predict the corresponding remaining service life of shear capacity of RC T-section simple supported beam bridges, the designed target reliability index decreased by 0.5 was suggested to be the lowest reliability index of the beam. Based on the simple stochastic process model for resistance, the relative reduction coefficients corresponding to the adopted lowest reliability indexes for different assessment reference periods were calculated, and a new method using critical life curve to predict shear capacity of RC bridges was proposed. The proposed method was applied to predict the service life of shear capacity of an existing 20 m simple supported RC T-beam bridge. The calculation result indicates that the method is simple and practical, and is equivalent with life prediction method based on reliability theory.This method and can be used to predict the service life of shear capacity of deteriorating RC T-beam bridges without calculating the reliability index of deteriorating RC bridges.