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基于Weibull分布的钢筋混凝土通电加速可靠性评估
Reliability Evaluation of Reinforced Concrete under Electrified Acceleration Based on Weibull Distribution
投稿时间:2019-10-19  修订日期:2019-12-23
DOI:103969/j.issn.1007 9629202102011
中文关键词:  盐渍土  通电加速  Weibull分布  钢筋混凝土  参数估计  可靠性
英文关键词:saline soil  electric acceleration  Weibull distribution  reinforced concrete  parameter estimation  reliability
基金项目:国家自然科学基金资助项目(51168031,51868044);中铁一勘院科研开发基金(13 24 01);兰州理工大学红柳一流学科建设计划项目
              
作者单位
路承功
LU Chenggong
兰州理工大学土木工程学院,甘肃兰州730050
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
魏智强
WEI Zhiqiang
兰州理工大学理学院,甘肃兰州730050
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
乔宏霞
QIAO Hongxia
兰州理工大学土木工程学院,甘肃兰州730050
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
李刊
LI Kan
兰州理工大学土木工程学院,甘肃兰州730050
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
乔国斌
QIAO Guobin
兰州理工大学土木工程学院,甘肃兰州730050
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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中文摘要:
      将3种强度等级的钢筋混凝土棱柱体置于盐渍土中进行恒电流通电加速试验,定期利用电化学工作站进行无损检测,选择Weibull分布进行可靠性建模,采用中位秩法、查表法和极大似然法对形状参数与尺度参数进行估计.结果表明:在盐渍土通电加速环境下,可靠度曲线表现出三阶段变化特点,失效率初期较小而后期急剧增大;3类参数估计方法中,尺度参数值受参数估计方法影响小,而形状参数值受参数估计方法影响较大,其中中位秩法所得形状参数值偏大,而查表法所得形状参数值偏小,极大似然法所得形状参数值则介于两者之间;4种中位秩法所得形状参数估计值差异较大,而4种极大似然法所得形状参数估计值则非常相近;极大似然法的4种数值求解方法中,对分法和简单迭代法需要的迭代次数较多,而牛顿割线法和斯蒂芬森迭代法的迭代效率较高;强度等级越高,钢筋混凝土密度极值越小,失效时间越长,失效率越小.
英文摘要:
      Three kinds of reinforced concrete prisms with different strength grades were placed in heavy saline soil for constant current accelerated test. The electrochemical workstation was used for nondestructive testing regularly. Weibull distribution was selected for reliability modeling. The shape parameters and scale parameters were estimated by median rank method, look up table method and maximum likelihood method. The results show that under the electrified environment of saline soil, the reliability curve shows the characteristics of three stages, the failure rate value is small in the early stage, and increases sharply in the later stage. Among the three kinds of parameter estimation methods, the scale parameter estimation value is less affected by the parameter estimation method, while the shape parameter value is more affected by the parameter estimation method. The shape parameter value obtained by the median rank method is the largest, the shape parameter value obtained by the look up table method is the smallest, and the shape parameter value obtained by the maximum likelihood method is between the look up table method and the look up table method.The parameters estimated by the four kinds of median rank are quite different, but the parameters estimated by the maximum likelihood method are very similar. Among the four methods of maximum likelihood method, bisection method and simple iteration method have more iteration times, while Newton Secant method and Stephenson iteration method have higher iteration efficiency due to the introduction of derivatives. The strength has a significant impact on the reliability of reinforced concrete. The higher the strength grade is, the smaller the density extremum is, the longer the failure interval is, and the smaller the failure ratio is.
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