BFRP筋混凝土偏压短柱性能与承载力计算方法
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摘要
试验通过7根BFRP筋混凝土偏心受压柱力学性能试验,分析破坏形态,测量柱中截面的应变分布、柱中侧向挠度、BFRP纵筋及混凝土的应变.试验结果表明:BFRP筋混凝土偏压柱的破坏特征均为混凝土压碎破坏;正截面应变满足平截面假定;构件的极限承载力随着偏心距的增大而减小,随着单侧配筋率的增大而有所增大;混凝土强度的提高可以显著提高构件的极限承载力.提出了BFRP筋混凝土偏心受压短柱的承载力计算方法,理论公式的计算结果同试验结果相比误差较小.
The effects of concrete strength,longitudinal reinforcement ratio and eccentricity on the cracking load,ultimate load,lateral deformation and crack width were investigated by the mechanical properties test of 7 eccentrically compressed concrete columns reinforced with BFRP bars. The test results indicate that,the failure modes of BFRP reinforced concrete columns are all concrete crushing failure. Strains in the middle section accord with the plane section assumption. The ultimate bearing capacity of columns decreases with the increase of eccentricity,and increases with the increase of reinforcement ratio. The increase of concrete strength can significantly improve the ultimate bearing capacity of columns. The calculation method of bearing capacity of BFRP reinforced concrete short columns is put forward in the paper,and the calculation results agree well with the test results.
The effects of concrete strength,longitudinal reinforcement ratio and eccentricity on the cracking load,ultimate load,lateral deformation and crack width were investigated by the mechanical properties test of 7 eccentrically compressed concrete columns reinforced with BFRP bars. The test results indicate that,the failure modes of BFRP reinforced concrete columns are all concrete crushing failure. Strains in the middle section accord with the plane section assumption. The ultimate bearing capacity of columns decreases with the increase of eccentricity,and increases with the increase of reinforcement ratio. The increase of concrete strength can significantly improve the ultimate bearing capacity of columns. The calculation method of bearing capacity of BFRP reinforced concrete short columns is put forward in the paper,and the calculation results agree well with the test results.
引文
[1]梁兴文,王社良,李晓文.混凝土结构设计原理[M]. 2版.北京:科学出版社,2007.
[2]钟小平,金伟良.钢筋混凝土结构基于耐久性的可靠度设计方法[J].土木工程学报,2016(5):31-39.
[3]李士彬,汤红卫,张鑫,等.自然锈蚀钢筋的疲劳试验[J].建筑材料学报,2014,17(5):811-815.
[4]李士彬,张伟平,顾祥林,等.锈后无黏结钢筋混凝土梁的模拟疲劳试验与分析[J].西安建筑科技大学学报(自然科学版),2010,42(1):9-14.
[5]刘志勇,吴桂芹,马立国,等. FRP筋及其增强砼的耐久性与寿命预测[J].烟台大学学报(自然科学与工程版),2005,18(1):66-73.
[6]薛伟辰,康清梁.纤维塑料筋在混凝土结构中的应用[J].工业建筑,1999(2):19-21.
[7]冯鹏,叶列平. FRP结构和FRP组合结构在结构工程中的应用与发展[C]//全国土木工程用纤维增强复合材料(FRP)应用技术学术交流会论文集,2002.
[8] SAATCIOGLU M,SHARBATDAR K. Use of frp reinforcement in columns of new structures[C]//FRP Composites in Civil Engineering. Proceedings of the International Conference on FRP Composites in Civil Engineering,December 12-15,2001,Hongkong,China. Kidington,Oxford,United Kingdom:Elsevier,c2001:1219-1226.
[9]龚永智,张继文. CFRP筋增强混凝土偏心受压柱受力性能的试验研究[J].土木工程学报,2009(10):46-52.
[10]方志庆. GFRP筋混凝土柱受压性能试验与计算方法研究[D].上海:同济大学,2013.
[11]吴芳.玄武岩纤维筋与混凝土粘结性能试验研究[D].大连:大连理工大学,2009.
[12]张新越,欧进萍. FRP加筋混凝土短柱受压性能试验研究[J].西安建筑科技大学学报(自然科学版),2006,38(4):467-472.
[13]孙丽,王世光,侯娜,等. GFRP筋混凝土短柱偏压性能试验研究[J].建筑科学与工程学报,2014,31(4):23-28.
[14]毕傈俐.基于混合配筋的FRP筋混凝土偏心受压柱性能研究[D].重庆:重庆大学,2013.
[15]周继凯,杜钦庆,袁明亮,等. GFRP筋抗压力学性能试验研究[J].河海大学学报(自然科学版),2008,36(4):542-545.
[16] ALSAYED S H,AI-SALLOUM Y A,ALMUSALLAM T H,et al. Concrete columns reinforced by glass fiber reinforced polymer rods[Z]. Farmington Hill,MI:American Concrete Institute,1999.
[17]龚永智,张继文. FRP筋增强混凝土压弯构件最小配筋率的讨论[J].武汉理工大学学报,2008,30(2):61-65.
[18] ACI Committee 440. Guide for the design and construction of structural concrete reinforced with frp bars:ACI 440.1R-06[S].Farmington Hills,MI:American Concrete Institute,2006.
[19]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.
[20]中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.
[2]钟小平,金伟良.钢筋混凝土结构基于耐久性的可靠度设计方法[J].土木工程学报,2016(5):31-39.
[3]李士彬,汤红卫,张鑫,等.自然锈蚀钢筋的疲劳试验[J].建筑材料学报,2014,17(5):811-815.
[4]李士彬,张伟平,顾祥林,等.锈后无黏结钢筋混凝土梁的模拟疲劳试验与分析[J].西安建筑科技大学学报(自然科学版),2010,42(1):9-14.
[5]刘志勇,吴桂芹,马立国,等. FRP筋及其增强砼的耐久性与寿命预测[J].烟台大学学报(自然科学与工程版),2005,18(1):66-73.
[6]薛伟辰,康清梁.纤维塑料筋在混凝土结构中的应用[J].工业建筑,1999(2):19-21.
[7]冯鹏,叶列平. FRP结构和FRP组合结构在结构工程中的应用与发展[C]//全国土木工程用纤维增强复合材料(FRP)应用技术学术交流会论文集,2002.
[8] SAATCIOGLU M,SHARBATDAR K. Use of frp reinforcement in columns of new structures[C]//FRP Composites in Civil Engineering. Proceedings of the International Conference on FRP Composites in Civil Engineering,December 12-15,2001,Hongkong,China. Kidington,Oxford,United Kingdom:Elsevier,c2001:1219-1226.
[9]龚永智,张继文. CFRP筋增强混凝土偏心受压柱受力性能的试验研究[J].土木工程学报,2009(10):46-52.
[10]方志庆. GFRP筋混凝土柱受压性能试验与计算方法研究[D].上海:同济大学,2013.
[11]吴芳.玄武岩纤维筋与混凝土粘结性能试验研究[D].大连:大连理工大学,2009.
[12]张新越,欧进萍. FRP加筋混凝土短柱受压性能试验研究[J].西安建筑科技大学学报(自然科学版),2006,38(4):467-472.
[13]孙丽,王世光,侯娜,等. GFRP筋混凝土短柱偏压性能试验研究[J].建筑科学与工程学报,2014,31(4):23-28.
[14]毕傈俐.基于混合配筋的FRP筋混凝土偏心受压柱性能研究[D].重庆:重庆大学,2013.
[15]周继凯,杜钦庆,袁明亮,等. GFRP筋抗压力学性能试验研究[J].河海大学学报(自然科学版),2008,36(4):542-545.
[16] ALSAYED S H,AI-SALLOUM Y A,ALMUSALLAM T H,et al. Concrete columns reinforced by glass fiber reinforced polymer rods[Z]. Farmington Hill,MI:American Concrete Institute,1999.
[17]龚永智,张继文. FRP筋增强混凝土压弯构件最小配筋率的讨论[J].武汉理工大学学报,2008,30(2):61-65.
[18] ACI Committee 440. Guide for the design and construction of structural concrete reinforced with frp bars:ACI 440.1R-06[S].Farmington Hills,MI:American Concrete Institute,2006.
[19]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.
[20]中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.