摘要
为建立基于可靠性的在役T形截面简支梁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对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载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。
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.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第4期84-88,115,共6页
Journal of Highway and Transportation Research and Development
基金
交通部科技攻关项目(2005353341190)
山东省交通科技项目(2005Y006)
山东省自然科学基金资助项目(Y2007F48)
关键词
桥梁工程
临界寿命曲线
可靠性分析
T形梁桥
寿命预测
bridge engineering
critical life curve
reliability analysis
T-beam bridge
life prediction
