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许开成,曹艳明,陈子超,陈梦成,付斌,朱东勉.模拟酸雨腐蚀下预应力混凝土梁的抗弯性能研究
Study on flexural behavior of prestressed concrete beams under simulated acid rain corrosion[J].计算力学学报,2019,36(1):124~131
模拟酸雨腐蚀下预应力混凝土梁的抗弯性能研究
Study on flexural behavior of prestressed concrete beams under simulated acid rain corrosion
Study on flexural behavior of prestressed concrete beams under simulated acid rain corrosion
投稿时间:2017-09-29  修订日期:2018-03-04
DOI:10.7511/jslx20170929003
中文关键词:  预应力混凝土  酸雨腐蚀  试验研究  抗弯承载力  非线性有限元分析
英文关键词:prestressed concrete  acid rain corrosion  experimental research  flexural capacity  nonlinear finite element analysis
基金项目:国家自然科学基金(51468017,51378206);江西省研究生创新基金(YC2017-S245)资助项目.
作者单位E-mail
许开成 华东交通大学 土木建筑学院, 南昌 330013
江西省建筑过程模拟与控制重点实验室, 南昌 330013 
505958373@qq.com 
曹艳明 华东交通大学 土木建筑学院, 南昌 330013  
陈子超 华东交通大学 土木建筑学院, 南昌 330013  
陈梦成 华东交通大学 土木建筑学院, 南昌 330013
江西省建筑过程模拟与控制重点实验室, 南昌 330013 
 
付斌 华东交通大学 土木建筑学院, 南昌 330013  
朱东勉 华东交通大学 土木建筑学院, 南昌 330013  
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中文摘要:
      为了探讨酸雨腐蚀环境对预应力混凝土梁抗弯性能的影响,制作了8根预应力混凝土梁,从混凝土强度等级、预应力度和钢绞线腐蚀率等方面,进行8根预应力混凝土梁的三分点静载试验。试验结果及分析表明,混凝土强度对屈服后试验梁的抗弯性能影响较大,对弹性阶段的刚度影响较小;随着预应力度的增加,试验梁的开裂荷载逐渐增大,进入裂缝阶段后,刚度下降速度逐渐加快;钢绞线腐蚀率越大,试验梁的极限抗弯承载力越低;腐蚀率在一定范围内(>3.22%),随着腐蚀率的增大,预应力混凝土梁试件的开裂弯矩、屈服弯矩和极限弯矩明显降低。根据试验结果,提出了模拟酸雨环境下预应力混凝土梁试件抗弯承载力的计算方法,同时采用ANSYS软件对预应力混凝土梁进行非线性有限元分析,将试验梁的计算值和模拟值与试验值进行比较,均吻合较好。
英文摘要:
      In order to investigate the influence of acid rain environment on the flexural behavior of prestressed concrete beams,eight prestressed concrete beams were fabricated.They were subjected to three-point bending tests to investigate the concrete strength grade,prestressing ratio and corrosion rate of steel strand.The experimental results and analysis indicate that the strength of concrete has a great influence on the flexural behavior of post-yielding beams,but has little effect on the stiffness of the post-yielding beams;with the increase of prestressing force,the cracking load of the beams gradually increases; after entering into the fracture stage,the rate of stiffness decrease gradually increases; the greater the corrosion rate of steel strand,the lower the ultimate bending capacity of the test beams; within the a certain range(>3.22%),with increasing corrosion rate,the effects of corrosion have a significant impact on the cracking moment,the yield moment and the ultimate moment.Based on the test results,the paper puts forward the formula to predict the flexural capacity of prestressed concrete beams in acid rain corrosion environment;in addition,nonlinear finite element analysis of prestressed concrete beams was conducted in ANSYS software.The experimental results of the test beams are in good agreement with the calculated results and the simulation results.
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