不锈钢钢筋混凝土梁抗震性能试验研究
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摘要
通过3根不锈钢钢筋混凝土梁和1根普通钢筋混凝土梁的拟静力试验,研究不锈钢钢筋混凝土梁的抗震性能。结果表明:试验梁在荷载作用下均经历了弹性阶段、屈服阶段、强化阶段和强度退化阶段;与普通钢筋混凝土梁相比,不锈钢钢筋混凝土梁的屈服位移、极限位移和位移延性系数均有明显增大,延性性能得到改善,强度和刚度退化较为平缓,滞回曲线较为饱满,滞回环面积加大,其总耗能是普通钢筋混凝土梁的2.36～4.25倍,其能量耗散系数是普通钢筋混凝土梁的1.12～2.63倍,表现出良好的抗震性能。随着配箍率的增加,不锈钢钢筋混凝土梁试件的极限承载力、屈服强度、延性、耗能能力逐渐增大,刚度退化减缓。随着混凝土强度的提高,试验梁的承载能力、屈服强度、刚度和总耗能明显提高,但位移延性系数有所降低。
Based on the quasi-static test of three stainless steel reinforced concrete beams(SSRCB) and an ordinary steel reinforced concrete beam(OSRCB),the seismic behavior of SSRCB was studied.Results show that the test beams have all experienced the elastic stage,the yield stage,the hardening stage and the strength degradation stage under the design load.Compared with the OSRCB,the yield displacement,the ultimate displacement and the displacement ductility factor of the SSRCB have been increased obviously.The ductility performance has been improved.The degradation of the strength and the rigidity is moderate.The hysteresis curve is plump and the area of the hysteretic loop is larger.The total energy dissipation of the SSRCB is 2.36～4.25 times of the OSRCB and the energy dissipation coefficient is 1.12～2.63 times of the OSRCB,which exhibits good seismic performance.With the increase of the stirrup ratio,the ultimate bearing capacity,the yield strength,the ductility,the energy dissipation capacity of the SSRCB specimens increase gradually,and the stiffness degradation is slow down.With the increase of the concrete strength,the bearing capacity of the test beams,the yield strength,the stiffness and the total energy dissipation are increased significantly,but the displacement ductility factor is decreased.
Based on the quasi-static test of three stainless steel reinforced concrete beams(SSRCB) and an ordinary steel reinforced concrete beam(OSRCB),the seismic behavior of SSRCB was studied.Results show that the test beams have all experienced the elastic stage,the yield stage,the hardening stage and the strength degradation stage under the design load.Compared with the OSRCB,the yield displacement,the ultimate displacement and the displacement ductility factor of the SSRCB have been increased obviously.The ductility performance has been improved.The degradation of the strength and the rigidity is moderate.The hysteresis curve is plump and the area of the hysteretic loop is larger.The total energy dissipation of the SSRCB is 2.36～4.25 times of the OSRCB and the energy dissipation coefficient is 1.12～2.63 times of the OSRCB,which exhibits good seismic performance.With the increase of the stirrup ratio,the ultimate bearing capacity,the yield strength,the ductility,the energy dissipation capacity of the SSRCB specimens increase gradually,and the stiffness degradation is slow down.With the increase of the concrete strength,the bearing capacity of the test beams,the yield strength,the stiffness and the total energy dissipation are increased significantly,but the displacement ductility factor is decreased.
引文
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[2]British Standards Institution.BS 6744—2001 Stainless Steel Bars for the Reinforcement and Usein Concrete-Require-ments and Test Methods[S].UK:British Standards Institution,2001.
[3]American Society for Testing and Materials.A955/A995 M—2004 Standard Specification for Deformed and PlainStainless Steel Bars for Concrete Reinforcement[S].USA:American Society for Testing and Materials,2004.
[4]孙晓东.主筋锈蚀钢筋混凝土梁疲劳实验研究[D].长沙:湖南大学,2006.(SUN Xiaodong.A Fatigue Experi mental Investigation on Reinforced Concrete Beams with Corroded Main Bars[D].Changsha:Hunan University,2006.in Chinese)
[5]卢木.混凝土耐久性研究现状和研究方向[J].工业建筑,1997,27(5):1-6.(LU Mu.Recent Study and Research Directions of Concrete Durability[J].Industrial Construction,1997,27(5):1-6.in Chinese)
[6]贡金鑫,赵国藩.钢筋混凝土结构耐久性研究的进展[J].工业建筑,2000,30(5):1-5.(GONGJinxin,ZHAO Guofan.State of the Art of Durability Research of Reinforced Concrete Structures[J].In-dustrial Construction,2000,30(5):1-5.in Chinese)
[7]贾红梅,阎贵平,闫光杰.混凝土中钢筋锈蚀的研究[J].中国安全科学学报,2005,15(5):56-59.(JIA Hongmei,YAN Guiping,YAN Guangjie.Study on Corrosion of Reinforcement in Concrete[J].China SafetyScience Journal,2005,15(5):56-59.in Chinese)
[8]中华人民共和国建设部.GB 50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.(Ministry of Construction of the People’s Republic of China.GB50010—2002 Code for Design of Concrete Structures[S].Beijing:China Architecture&Building Press,2002.in Chinese)
[9]朱伯龙.结构抗震试验[M].北京:地震出版社,1989:138-139.
[10]中华人民共和国建设部.JGJ 101—96建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.(Ministry of Construction of the People’s Republic of China.JGJ 101—96 Specificating of Testing Methods forEarthquake Resistant Building[S].Beijing:China Architecture&Building Press,1997.in Chinese)
[11]中华人民共和国建设部.GB 50152—92混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.(Ministry of Construction of the People’s Republic of China.GB50152—92 Standard Methods for Testing of ConcreteStructures[S].Beijing:China Architecture&Building Press,1992.in Chinese)
[12]NMAI C K,DARWIN D.Cyclic Behavior of Lightly Reinforced Concrete Beams[R].USA:University of KansasCenter for Research,1984.
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