摘要
为了分析混凝土结构在氯盐环境下的全寿命周期成本,基于现有氯离子扩散模型和裂缝宽度预测模型,采用MATLAB软件进行Monte-Carlo抽样模拟,建立结构失效概率与可靠度指标的拟合公式。通过研究维护-加固措施对可靠度指标的影响,建立全寿命周期内维护-加固费用计算评估方法,并以混凝土桥梁结构为例计算了全寿命周期维护-加固成本。结果表明:失效概率与可靠度指标可用以失效概率等于0.1为界的分段函数进行描述;维护-加固效果持续时间对结构构件服役年限延长的影响最显著;当保护层厚度取60mm时,维护-加固阶段费用有明显下降,较保护层厚度取40mm时减少25%~50%。
In order to analyze the life-cycle cost of concrete structures in chloride environment,the existing chloride diffusion model and crack width prediction model were used,Monte-Carlo sampling simulation was carried out using MATLAB software,and the fitting formula of structural failure probability and reliability index was established.The calculation method of maintenance-reinforcement cost in the whole life cycle was established combining the influence of maintenance-reinforcement measures on reliability index,and the life-cycle maintenancereinforcement cost was calculated by taking concrete bridge structure as an example.The results show that the failure probability and reliability index can be described by piecewise function with failure probabilities being 0.1 as boundary.The duration of maintenance-reinforcement effect has the most obvious effect on service life extension of structural members.When the thickness of protective layer is 60 mm,the maintenance-reinforcement cost decreases obviously,and is reduced by 25%-50% compared with the thickness of protective layer 40 mm.
出处
《建筑科学与工程学报》
CAS
北大核心
2017年第2期71-78,共8页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51278230
51378241
51578267)
教育部高等学校博士学科点专项科研基金项目(20123227110006)
江苏省普通高校研究生实践创新计划项目(SJLX15_0500)
关键词
混凝土结构
氯盐侵蚀
锈胀裂缝宽度
时变可靠度
全寿命成本
concrete structure
chloride erosion
corrosion crack width
time-varying reliability
life-cycle cost
