郑跃1,2,郑山锁1,2,明铭1,2,阮升1,2.酸雨侵蚀箍筋约束混凝土本构模型研究[J].湖南大学学报:自然科学版,2021,48(1):135~143
酸雨侵蚀箍筋约束混凝土本构模型研究
Research on Constitutive Model of Confined Concrete with Stirrups by Acid Rain Erosion
  
DOI:
中文关键词:  约束混凝土  应力-应变曲线  酸雨侵蚀  锈蚀箍筋  轴压试验  Mander模型
英文关键词:confined concrete  stress-strain curves  acid rain erosion  corroded stirrups  axial compression test  Mander’s model
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作者单位
郑跃1,2,郑山锁1,2,明铭1,2,阮升1,2 (1. 西安建筑科技大学 土木工程学院陕西 西安710055 2. 结构工程与抗震教育部重点实验室(西安建筑科技大学)陕西 西安710055) 
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中文摘要:
      采用人工气候环境模拟技术模拟酸雨环境,对15组箍筋约束混凝土棱柱体试件进行加速腐蚀,进而进行轴压试验,研究了箍筋锈蚀对约束混凝土破坏形态、峰值应力、峰值应变、极限应变和应力-应变曲线形状的影响. 基于Mander模型及现有研究成果,确定了未腐蚀试件本构模型峰值应力、峰值应变、极限应变和形状系数等参数的计算公式,并通过对试验结果的回归分析,得到了考虑箍筋锈蚀率影响的形状系数和各特征点参数修正系数拟合公式,最终建立了酸雨侵蚀箍筋约束混凝土本构模型. 与试验结果对比发现,采用该模型计算得到的各试件峰值应力、峰值应变、极限应变及应力-应变曲线形状均与试验结果符合较好,表明所建立的本构模型能较为准确地反映遭受酸雨侵蚀箍筋约束混凝土力学性能,可用于该环境下RC结构剩余承载力及抗震性能评估.
英文摘要:
      In order to study the influence of stirrup corrosion level on the failure modes, peak stress, peak strain, ultimate strain and shape of stress-strain curve of the confined concrete,15 reinforced concrete prism specimens are subjected to acid rain erosion in the acid environment modeled by artificial climate simulation technique followed by axial compression tests. Based on the Mander’s model and the existing research results, the calculation formulas for the peak stress,peak strain, ultimate strain and shape factor of the uncorroded specimens are determined. The factor calculation formulas for peak stress, peak strain, ultimate strain and shape factor of corroded specimens are developed by regression analysis of test data, respectively, and then the constitutive model of confined concrete by acid rain erosion is established. By comparing the simulation results with the experimental data, it can be found that all the peak stress, peak strain, ultimate strain and stress-strain curves shape of the specimens obtained by proposed method are in good agreement with the experimental data. Thus, the constitutive mode for confined concrete established in this paper can accurately reflect the mechanical performance of RC prism specimen by acid rain erosion, indicating its adaptiveness for estimating the residual bearing capacity and the seismic performance of RC structure under the acid rain environment.
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