欢迎光临《计算力学学报》官方网站!
钢筋混凝土柱抗弯承载力的概率模型与校准分析
PROBABILISTIC MODEL AND CALIBRATION OF FLEXURE STRENGTH OF REINFORCED CONCRETE COLUMNS
投稿时间:2019-06-11  修订日期:2019-08-07
DOI:
中文关键词:  钢筋混凝土柱  抗弯承载力  不确定性  概率模型  概率校准
英文关键词:reinforced concrete columns  flexure strength  uncertainties  probabilistic model  probabilistic calibration
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
余波 广西大学 gxuyubo@gxu.edu.cn 
刘圣宾 广西大学  
丁自豪 广西大学  
张永兵 广西大学  
摘要点击次数: 676
全文下载次数: 0
中文摘要:
      为了克服传统确定性抗弯承载力模型和校准方法无法合理考虑不确定性所存在的缺陷,分别建立了钢筋混凝土(RC)柱的概率抗弯承载力模型与概率校准方法。首先基于RC柱正截面受弯承载力的基本假定,结合偏心受压RC柱的截面内力平衡条件,分别建立了大(小)偏心受压RC柱的确定性抗弯承载力模型;然后综合考虑固有不确定性和认知不确定性的影响,分别建立了大(小)偏心受压RC柱概率抗弯承载力模型的解析表达式,进而结合贝叶斯理论和MCMC法确定了概率模型参数的后验分布信息,从而建立了RC柱的概率抗弯承载力模型;最后基于概率抗弯承载力模型所确定的概率密度函数、置信区间和置信水平,提出了传统确定性抗弯承载力模型的概率校准方法。研究结果表明,所建立的概率抗弯承载力模型不仅可以合理描述RC柱抗弯承载力的概率分布特性,而且可以校准传统确定性抗弯承载力模型的计算精度和置信水平。
英文摘要:
      Probabilistic model and calibration method for flexure strength of reinforced concrete (RC) columns were proposed to overcome the disadvantage that traditional deterministic flexure strength models and calibration methods cannot rationally consider the influence of uncertainties. Based on the basic assumption of flexure strength analysis of RC members, deterministic flexure strength models for large (small) eccentric compression RC columns was established firstly according to the force balance condition of eccentric compression RC columns. Then analytical expressions for probabilistic flexure strength models of RC columns were developed by considering the influences of both aleatory and epistemic uncertainties. Subsequently, probabilistic models were established by determining the posterior distribution information of probabilistic model parameters based on the Bayesian theory and the Markov chain Monte Carlo (MCMC) method. Finally, probabilistic calibration methods of traditional deterministic flexure strength models were proposed based on the probability density function, confidence interval and confidence level determined by the proposed probabilistic models. Analysis results show that the probabilistic flexure strength models not only can reasonably describe the probabilistic characteristics of flexure strength, but also provides an efficient way to calibrate the accuracy and confidence level of traditional deterministic flexure strength models of RC columns.
  查看/发表评论  下载PDF阅读器
您是第5906539位访问者
版权所有:《计算力学学报》编辑部
本系统由 北京勤云科技发展有限公司设计