CFRP加固锈蚀钢筋混凝土短柱的抗震性能
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摘要
为评估CFRP加固锈蚀钢筋混凝土短柱抗震性能的效果,选取1根未锈蚀钢筋混凝土短柱、2根锈蚀钢筋混凝土短柱和4根CFRP加固锈蚀钢筋混凝土短柱进行抗震性能试验研究,考察了CFRP加固量、细骨料类型对抗震加固效果的影响情况,建议了CFRP加固锈蚀钢筋混凝土短柱受剪承载力的实用计算公式。结果表明:钢筋锈蚀会降低短柱的抗震性能,锈蚀钢筋试件的受剪承载力、极限变形能力和累积滞回耗能较未锈蚀钢筋试件分别降低了7.8%、35.5%和42.2%;外包CFRP加固能将锈蚀钢筋试件的受剪承载力提高至未锈蚀钢筋试件的107.1%～109.1%,并显著改善短柱的延性和耗能能力;外包CFRP的层数由1层增至2层时,加固试件的受剪承载力提高较少,且试件达到峰值荷载时,CFRP的最大应变减少;在钢筋锈蚀前后和CFRP加固前后,混凝土短柱无量纲近极限滞回环的滞回规则大体相同。
To investigate the influence of CFRP and fine aggregate type on strengthened seismic performance of corroded reinforced concrete short columns(RCSCs),the pseudo-static tests of one un-corroded reinforced concrete short column reinforceel concrete short column(RCSC),two corroded RCSCs and four corroded RCSCs strengthened with CFRP were carried out in this study.Besides,apractical method to calculate the shear strength of corroded reinforced concrete columns strengthened with CFRP was suggested.Experimental results show that the corrosion of steel bars will weaken the seismic performance of short columns.The shear bearing capacity,ultimate deformation capacity and cumulative hysteretic energy dissipation of corroded RCSCs are reduced by 7.8%,35.5% and 42.2%,respectively.CFRP wrapping can enhance the shear strength of corroded RCSCs to a level of 107.1%～109.1% of that uncorroded RCSC,and can significantly improve the ductility and energy dissipation capacity of corroded RCSCs.When CFRP layer is increased from one to two,the shear capacity of the reinforced specimen is marginally improved,and the maximum strain of CFRP decreases when the specimen reaches the peak load.Moreover,the hysteretic rules for the dimensionless hysteresis loops of RCSCs closed to limit state for cases with un-corrosion and with corrosion,without CFRP strengthening and with CFRP strengthening are similar.
To investigate the influence of CFRP and fine aggregate type on strengthened seismic performance of corroded reinforced concrete short columns(RCSCs),the pseudo-static tests of one un-corroded reinforced concrete short column reinforceel concrete short column(RCSC),two corroded RCSCs and four corroded RCSCs strengthened with CFRP were carried out in this study.Besides,apractical method to calculate the shear strength of corroded reinforced concrete columns strengthened with CFRP was suggested.Experimental results show that the corrosion of steel bars will weaken the seismic performance of short columns.The shear bearing capacity,ultimate deformation capacity and cumulative hysteretic energy dissipation of corroded RCSCs are reduced by 7.8%,35.5% and 42.2%,respectively.CFRP wrapping can enhance the shear strength of corroded RCSCs to a level of 107.1%～109.1% of that uncorroded RCSC,and can significantly improve the ductility and energy dissipation capacity of corroded RCSCs.When CFRP layer is increased from one to two,the shear capacity of the reinforced specimen is marginally improved,and the maximum strain of CFRP decreases when the specimen reaches the peak load.Moreover,the hysteretic rules for the dimensionless hysteresis loops of RCSCs closed to limit state for cases with un-corrosion and with corrosion,without CFRP strengthening and with CFRP strengthening are similar.
引文
[1]余璠璟,曹大富,李琮琦.钢筋混凝土锈蚀损伤研究综述[J].重庆建筑大学学报,2007,29(1):122-125.YU F J,CAO D F,LI Z Q.Review of research on damage of corroded reinforced concrete[J].Journal of Chongqing Jianzhu University,2007,29(1):122-125.(in Chinese)
[2]王晨霞,王宇,李敬红,等.再生混凝土与锈蚀钢筋间的粘结性能试验研究[J].土木建筑与环境工程,2016,38(1):46-53.WANG C X,WANG Y,LI J H,et al.Experimental analysis on bond behavior between recycled concrete and corroded steel bars[J]. Journal of Civil,Architectural &Environmental Engineering,2016,38(1):46-53.(in Chinese)
[3]易伟建,雷国强.锈蚀钢筋混凝土偏心受压柱承载力试验研究[J].湖南大学学报(自然科学版),2008,35(3):6-10.YI W J,LEI G Q.Experimental research on the bearing capacity of corroded reinforced concrete columns[J].Journal of Hunan University(Natural Sciences),2008,35(3):6-10.(in Chinese)
[4]CAMPIONE G,CANNELLA F,CAVALERI L,et al. Moment-axial force domain of corroded R.C.columns[J].Materials and Structures,2017,50:21.
[5]陈晓晨,刘西拉,宋晓冰.锈蚀钢筋混凝土柱承载力的计算模型[J].上海交通大学学报,2008,42(6):985-988.CHEN X C,LIU X L,SONG X B.Computational model for bearing capacity of corroded reinforced concrete columns[J].Journal of Shanghai Jiaotong University,2008,42(6):985-988.(in Chinese)
[6]史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程振动,2000,20(4):44-50.SHI Q X,NIU D T,YAN G Y.Experimental research on hysteretic characteristics of corroded RC.members with fiexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Vibration,2000,20(4):44-50.(in Chinese)
[7]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38,45.NIU D T,CHEN X X,WANG X M.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structure,2004,34(10):36-38,45.(in Chinese)
[8]李金波,贡金鑫.钢筋锈蚀对钢筋混凝土圆柱抗震性能的影响[J].中国公路学报,2008,21(4):55-60.LI J B,GONG J X.Influences of rebar corrosion on seismic behavior of circular RC columns[J].China Journal of Highway and Transport,2008,21(4):55-60.(in Chinese)
[9]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11):38-44,101.GONG J X,LI J B,ZHAO G F.Restoring force model of corroded reinforced concrete elements[J].China Civil Engineering Journal,2005,38(11):38-44,101.(in Chinese)
[10]YANG S Y,LIU X L.Seismic analytical model of shear strength for corroded RC column[J].Materials and Structures,2015,48(8):2671-2684.
[11]邓宗才,李朋远.CFRP加固锈蚀钢筋混凝土柱抗腐蚀性能试验研究[J].北京工业大学学报,2010,36(1):18-24.DENG Z C,LI P Y.Corrosion resistance research of corrosion-damaged reinforced concrete columns wrapped with CFRP[J].Journal of Beijing Polytechnic University,2010,36(1):18-24.(in Chinese)
[12]WOOTTON I A,SPAINHOUR L K,YAZDANI N.Corrosion of steel reinforcement in carbon fiberreinforced polymer wrapped concrete cylinders[J].Journal of Composites for Construction,2003,7(4):339-347.
[13]TASTANI S P,PANTAZOPOULOU S J.Experimental evaluation of FRP jackets in upgrading RC corroded columns with substandard detailing[J]. Engineering Structures,2004,26(6):817-829.
[14]FANG S,LAM E S S,WONG W Y.Using alkaliactivated slag ferrocement to strengthen corroded reinforced concrete columns[J]. Materials and Structures,2017,50:35.
[15]李金波,贡金鑫.碳纤维布包裹改善锈蚀钢筋混凝土柱延性试验研究[J].大连理工大学学报,2010,50(2):220-227.LI J B,GONG J X.Experimental research on ductile behavior of corroded reinforced concrete column confined with CFRP[J].Journal of Dalian University of Technology,2010,50(2):220-227.(in Chinese)
[16]李金波,贡金鑫,王利欢.增大截面和碳纤维布包裹复合加固锈蚀钢筋混凝土柱的抗震性能研究[J].土木工程学报,2009,42(4):17-26.LI J B,GONG J X,WANG L H.Experimental study on seismic behavior of corroded reinforced concrete columns strengthened with concrete jacket and CFRP[J].China Civil Engineering Journal,2009,42(4):17-26.(in Chinese)
[17]LIN J B, GONG J X.Seismic strengthening of reinforced concrete columns damaged by rebar corrosion using combined CFRP and steel jacket[J].Journal of Southeast University(English Edition),2009,25(4):506-512.
[18]LEE H S,KAGE T,NOGUCHI T,et al. An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets[J].Cement and Concrete Research, 2003, 33(4):563-570.
[19]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 Y H, GU X L, ZHANG W P,et al.Accelerated corrosion technique for reinforcement steel bars in concrete[J].Structural Engineers,2009,25(1):101-105.(in Chinese)
[20]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,2003:336-337.GUO Z H,SHI X D.Reinforced concrete theory and analyse[M].Beijing:Tsinghua University Press,2003:336-337.(in Chinese)
[21]混凝土结构加固设计规范:GB 50367—2013[S].北京:中国建筑工业出版社,2013:85-86.Code for design of strengthening concrete structure:GB50367-2013[S]. Beijing:China Architecture &Building Press,2013:85-86.(in Chinese)
[22]张伟平,商登峰,顾祥林.锈蚀钢筋应力-应变关系研究[J].同济大学学报(自然科学版),2006,34(5):586-592.ZHANG W P,SHANG D F,GU X L.Stress-strain relationship of corroded steel bars[J].Journal of Tongji University(Natural Science),2006,34(5):586-592.(in Chinese)
[2]王晨霞,王宇,李敬红,等.再生混凝土与锈蚀钢筋间的粘结性能试验研究[J].土木建筑与环境工程,2016,38(1):46-53.WANG C X,WANG Y,LI J H,et al.Experimental analysis on bond behavior between recycled concrete and corroded steel bars[J]. Journal of Civil,Architectural &Environmental Engineering,2016,38(1):46-53.(in Chinese)
[3]易伟建,雷国强.锈蚀钢筋混凝土偏心受压柱承载力试验研究[J].湖南大学学报(自然科学版),2008,35(3):6-10.YI W J,LEI G Q.Experimental research on the bearing capacity of corroded reinforced concrete columns[J].Journal of Hunan University(Natural Sciences),2008,35(3):6-10.(in Chinese)
[4]CAMPIONE G,CANNELLA F,CAVALERI L,et al. Moment-axial force domain of corroded R.C.columns[J].Materials and Structures,2017,50:21.
[5]陈晓晨,刘西拉,宋晓冰.锈蚀钢筋混凝土柱承载力的计算模型[J].上海交通大学学报,2008,42(6):985-988.CHEN X C,LIU X L,SONG X B.Computational model for bearing capacity of corroded reinforced concrete columns[J].Journal of Shanghai Jiaotong University,2008,42(6):985-988.(in Chinese)
[6]史庆轩,牛荻涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程振动,2000,20(4):44-50.SHI Q X,NIU D T,YAN G Y.Experimental research on hysteretic characteristics of corroded RC.members with fiexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Vibration,2000,20(4):44-50.(in Chinese)
[7]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38,45.NIU D T,CHEN X X,WANG X M.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structure,2004,34(10):36-38,45.(in Chinese)
[8]李金波,贡金鑫.钢筋锈蚀对钢筋混凝土圆柱抗震性能的影响[J].中国公路学报,2008,21(4):55-60.LI J B,GONG J X.Influences of rebar corrosion on seismic behavior of circular RC columns[J].China Journal of Highway and Transport,2008,21(4):55-60.(in Chinese)
[9]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11):38-44,101.GONG J X,LI J B,ZHAO G F.Restoring force model of corroded reinforced concrete elements[J].China Civil Engineering Journal,2005,38(11):38-44,101.(in Chinese)
[10]YANG S Y,LIU X L.Seismic analytical model of shear strength for corroded RC column[J].Materials and Structures,2015,48(8):2671-2684.
[11]邓宗才,李朋远.CFRP加固锈蚀钢筋混凝土柱抗腐蚀性能试验研究[J].北京工业大学学报,2010,36(1):18-24.DENG Z C,LI P Y.Corrosion resistance research of corrosion-damaged reinforced concrete columns wrapped with CFRP[J].Journal of Beijing Polytechnic University,2010,36(1):18-24.(in Chinese)
[12]WOOTTON I A,SPAINHOUR L K,YAZDANI N.Corrosion of steel reinforcement in carbon fiberreinforced polymer wrapped concrete cylinders[J].Journal of Composites for Construction,2003,7(4):339-347.
[13]TASTANI S P,PANTAZOPOULOU S J.Experimental evaluation of FRP jackets in upgrading RC corroded columns with substandard detailing[J]. Engineering Structures,2004,26(6):817-829.
[14]FANG S,LAM E S S,WONG W Y.Using alkaliactivated slag ferrocement to strengthen corroded reinforced concrete columns[J]. Materials and Structures,2017,50:35.
[15]李金波,贡金鑫.碳纤维布包裹改善锈蚀钢筋混凝土柱延性试验研究[J].大连理工大学学报,2010,50(2):220-227.LI J B,GONG J X.Experimental research on ductile behavior of corroded reinforced concrete column confined with CFRP[J].Journal of Dalian University of Technology,2010,50(2):220-227.(in Chinese)
[16]李金波,贡金鑫,王利欢.增大截面和碳纤维布包裹复合加固锈蚀钢筋混凝土柱的抗震性能研究[J].土木工程学报,2009,42(4):17-26.LI J B,GONG J X,WANG L H.Experimental study on seismic behavior of corroded reinforced concrete columns strengthened with concrete jacket and CFRP[J].China Civil Engineering Journal,2009,42(4):17-26.(in Chinese)
[17]LIN J B, GONG J X.Seismic strengthening of reinforced concrete columns damaged by rebar corrosion using combined CFRP and steel jacket[J].Journal of Southeast University(English Edition),2009,25(4):506-512.
[18]LEE H S,KAGE T,NOGUCHI T,et al. An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets[J].Cement and Concrete Research, 2003, 33(4):563-570.
[19]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 Y H, GU X L, ZHANG W P,et al.Accelerated corrosion technique for reinforcement steel bars in concrete[J].Structural Engineers,2009,25(1):101-105.(in Chinese)
[20]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,2003:336-337.GUO Z H,SHI X D.Reinforced concrete theory and analyse[M].Beijing:Tsinghua University Press,2003:336-337.(in Chinese)
[21]混凝土结构加固设计规范:GB 50367—2013[S].北京:中国建筑工业出版社,2013:85-86.Code for design of strengthening concrete structure:GB50367-2013[S]. Beijing:China Architecture &Building Press,2013:85-86.(in Chinese)
[22]张伟平,商登峰,顾祥林.锈蚀钢筋应力-应变关系研究[J].同济大学学报(自然科学版),2006,34(5):586-592.ZHANG W P,SHANG D F,GU X L.Stress-strain relationship of corroded steel bars[J].Journal of Tongji University(Natural Science),2006,34(5):586-592.(in Chinese)