模拟酸雨环境下圆钢管再生混凝土纯弯试验研究
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摘要
对模拟酸雨腐蚀后的8根圆钢管混凝土试件进行纯弯试验研究,考虑混凝土骨料类型和腐蚀率2个变化参数,研究变化参数对试件纯弯力学性能的影响;在此基础上,利用有限元分析软件,分别采用壁厚折减和材性折减两种方式来考虑酸雨腐蚀对试件纯弯力学性能的影响。研究结果表明:整体上所有试件均呈现出跨中弯曲变形,可知酸雨腐蚀对试件的破坏形态无明显影响;且所有试件直至试验结束,其跨中弯矩-挠度曲线均未出现下降段,表明在该腐蚀范围内,圆钢管混凝土试件在纯弯受力过程中仍具有良好的变形能力和延性;在相同腐蚀率下,圆钢管再生混凝土与圆钢管普通混凝土的极限承载力平均比值为0.94,表明圆钢管再生混凝土的极限承载力略低于圆钢管普通混凝土;随着腐蚀程度的加深,试件的刚度和极限承载力有明显降低;对比有限元计算结果与试验结果,验证了有限元建模方法的正确性及分别采用壁厚折减和材性折减来考虑酸雨环境对纯弯试件腐蚀影响的可行性。
Pure bending tests on 8 circle concrete filled steel tubes(CFST) subjected acid rain corrosion were carried out. Two parameters of concrete aggregate type and corrosion rate are considered to study the influences of the variation parameters on the pure bending mechanical properties of the specimens. Based on this, the finite element analysis software(FEA) is used to study the effects of acid rain corrosion on the pure bending mechanical properties of the specimen by adopting the methods of wall thickness reduction and material reduction respectively. The results show that, acid rain does not change the failure mode of pure bending specimens of RACFST. All the curves of the bending moments versus mid-span deflection of specimens do not show descending section until the end of the experiment, it shows that in the scope of the corrosion, the CFST still has good deformation capacity and ductility. Under the same corrosion rate, the average ratio of the ultimate bearing capacity of RACFST to CFST is 0.94, which indicates that the ultimate bearing capacity of RACFST is slightly lower than that of CFST. With the increasing of corrosion degree, the stiffness and the ultimate bearing capacity of the specimen decrease obviously. By comparison of the finite element calculation results with the test results, the correctness of the finite element modeling method is verified. It shows that the wall thickness reduction and material reduction respectively reflect the effects of acid rain environment on the pure bending mechanical properties of the circle RACFST.
Pure bending tests on 8 circle concrete filled steel tubes(CFST) subjected acid rain corrosion were carried out. Two parameters of concrete aggregate type and corrosion rate are considered to study the influences of the variation parameters on the pure bending mechanical properties of the specimens. Based on this, the finite element analysis software(FEA) is used to study the effects of acid rain corrosion on the pure bending mechanical properties of the specimen by adopting the methods of wall thickness reduction and material reduction respectively. The results show that, acid rain does not change the failure mode of pure bending specimens of RACFST. All the curves of the bending moments versus mid-span deflection of specimens do not show descending section until the end of the experiment, it shows that in the scope of the corrosion, the CFST still has good deformation capacity and ductility. Under the same corrosion rate, the average ratio of the ultimate bearing capacity of RACFST to CFST is 0.94, which indicates that the ultimate bearing capacity of RACFST is slightly lower than that of CFST. With the increasing of corrosion degree, the stiffness and the ultimate bearing capacity of the specimen decrease obviously. By comparison of the finite element calculation results with the test results, the correctness of the finite element modeling method is verified. It shows that the wall thickness reduction and material reduction respectively reflect the effects of acid rain environment on the pure bending mechanical properties of the circle RACFST.
引文
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[13]孙微.酸雨腐蚀后方钢管再生混凝土纯弯力学性能研究[D].南昌:华东交通大学,2016.(SUN Wei.Study on mechanical behavior of recycled concrete filled square steel tubes subjected to pure bending under the environment of acid rain[D].Nanchang:East China Jiaotong University,2016(in Chinese)).
[14]胡志慧,黄宏.酸雨腐蚀后圆钢管再生混凝土纯弯力学性能研究[C]//第26届全国结构工程学术会议论文集(第Ⅰ册).长沙:工程力学,2017.(HU Zhihui,HUANG Hong.The pure bending mechanical properties of recycled concrete-filled circular steel tubes after acid rain corrosion[C]//Proceedings of the 26th National Conference on Structural Engineering(No.Ⅰ).Changsha:Engineering Mechanics,2017(in Chinese)).
[2]杨有福.钢管再生混凝土构件受力机理研究[J].工业建筑,2007,37(12):7-12.(YANG Youfu.Study on bearing mechanisms of recycled aggregate concrete filled steel tubular members[J].Industrial construction,2007,37(12):7-12(in Chinese)).
[3]李兵,王维浩,孟爽.钢管再生混凝土受弯构件有限元分析[J].沈阳建筑大学学报(自然科学版),2014,30(4):644-650.(LI Bing,WANG Weihao,MENG Shuang.Finite element analysis for bending of recycled concrete filled steel tube[J].Journal of Shenyang Jianzhu university(natural science),2014,30(4):644-650(in Chinese)).
[4]HOU Chuanchuan,HAN Linhai,WANG Qingli.Flexural behavior of circular concrete filled steel tubes(CFST)under sustained load and chloride corrosion[J].Thin-walled structures,2016,107:182-196.
[5]邱斌,徐善华.锈蚀钢板力学性能的退化规律[J].机械工程材料,2014,38(10):60-64.(QIU Bin,XU Shanhua.Deterioration law of mechanical properties of corroded steel plates[J].Materials for mechanical engineering,2014,38(10):60-64(in Chinese)).
[6]陈梦成,张凡孟,王超,等.模拟酸雨腐蚀对低碳钢力学性能的退化规律[J].腐蚀与防护,2017,38(4):292-295.(CHENMengcheng,ZHANG Fanmeng,WANG Chao,et al.Degradation law of mechanical properties for low carbon steel corroded in simulated acid rain[J].Corrosion&protection,2017,38(4):292-295(in Chinese)).
[7]韩林海.钢管混凝土结构--理论与实践[M].北京:科学出版社,2016.(HAN Linhai.Concrete-filled steel tubular structure--theory and practice[M].Beijing:Science Press,2016(in Chinese)).
[8]陈梦成,王凯,谢力.酸雨侵蚀下水泥基材料的腐蚀损伤与评价--酸雨介质成分的影响[J].建筑科学,2012,28(3):20-24.(CHEN Mengcheng,WANG Kai,XIE Li.Deterioration of cement-concrete cementitious materials under acid rain attack and its evaluation-effect of acid rain components[J].Building science,2012,28(3):20-24(in Chinese)).
[9]陈梦成,罗晶,许开成.江西省酸雨特征分析及预测模型[J].环境科学与技术,2014,37(10):167-170.(CHEN Mengcheng,LUOJing,XU Kaicheng.Characteristics and prediction model of Jiangxi acid rain[J].Environmental science&technology,2014,37(10):167-170(in Chinese)).
[10]吴丹,王式功,尚可政.中国酸雨研究综述[J].干旱气象,2006,24(2):70-77.(WU Dan,WANG Shigong,SHANGKezheng.Progress in research of acid rain in China[J].Arid meteorology,2006,24(2):70-77(in Chinese)).
[11]向斌,陈文,胡婷婷.模拟酸雨中钢筋腐蚀行为的研究[J].钢铁研究,2009,37(3):30-32.(XIANG Bin,CHEN Wen,HUTingting.Study on steel corrosion behavior in simulated acid rain[J].Research on iron&steel,2009,37(3):30-32(in Chinese)).
[12]曾严红,顾祥林,张伟平,等.混凝土中钢筋加速锈蚀方法探讨[J].结构工程师,2009,25(1):101-105.(ZENG Yanhong,GU Xianglin,ZHANG Weiping,et al.Accelerated corrosion technique for reinforcement steel bars in concrete[J].Structural engineers,2009,25(1):101-105(in Chinese)).
[13]孙微.酸雨腐蚀后方钢管再生混凝土纯弯力学性能研究[D].南昌:华东交通大学,2016.(SUN Wei.Study on mechanical behavior of recycled concrete filled square steel tubes subjected to pure bending under the environment of acid rain[D].Nanchang:East China Jiaotong University,2016(in Chinese)).
[14]胡志慧,黄宏.酸雨腐蚀后圆钢管再生混凝土纯弯力学性能研究[C]//第26届全国结构工程学术会议论文集(第Ⅰ册).长沙:工程力学,2017.(HU Zhihui,HUANG Hong.The pure bending mechanical properties of recycled concrete-filled circular steel tubes after acid rain corrosion[C]//Proceedings of the 26th National Conference on Structural Engineering(No.Ⅰ).Changsha:Engineering Mechanics,2017(in Chinese)).
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