火灾后混凝土短柱的滞回性能和损伤评定
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摘要
基于7根明火加热后钢筋混凝土短柱和1根未受火的对比试件的拟静力试验结果,分析受火时间、轴压比和剪跨比对火灾后钢筋混凝土短柱滞回性能的影响情况.结合强度退化分析各试件的损伤发展过程,采用Park损伤模型对受火后短柱和未受火的对比试件的抗震性能进行损伤评定,提出一种能反映火灾高温对柱式构件抗震性能损伤影响加大的评价指标.研究结果表明:火灾后钢筋混凝土短柱在低周往复荷载作用下的滞回曲线和滞回规则与未受火对比件的相似,但受火后滞回环的稳定性较未受火的差;钢筋混凝土短柱的累积滞回耗能随着受火时间的增加,轴压比的减小,以及剪跨比的减小而减小;同一位移角下的强度退化随着受火时间的增加,轴压比的增大,以及剪跨比的增大而加快.此外,Park损伤评价模型对受火前后钢筋混凝土短柱的抗震性能损伤指数均存在超前估计的不足.
Based on the pseudo-static test data of seven reinforced concrete(RC)short columns after fire and one contrastive unfired specimen,the effects of fire exposure time,axial compressive ratio and shear span ratio on the hysteretic behaviors were analyzed.Combining strength degradation analysis which reflects the damage development process of the specimens,the Park′s damage model was adopted to assess the damage of aseismic behavior of specimens unfired and after fire.An assessment index of fire on aseismic performance damage was proposed.The results show that:the hysteretic curves and hysteretic rules of RC short columns after fire are similar to the column unfired,but the stability of RC short columns after fire is much poorer than the column unfired.The accumulated hysteretic dissipated energy of short columns decreases with increasing fire exposure time and with decreasing the axial compressive ratio and the shear span ratio.Under the same displacement angle,the strength degradation increases with increasing fire exposure time,the axial compressive ratio and the shear span ratio.There exist some disadvantages in Park′s damage model to estimate damage index of the aseismic behavior of reinforced concrete short columns before and after fire.
Based on the pseudo-static test data of seven reinforced concrete(RC)short columns after fire and one contrastive unfired specimen,the effects of fire exposure time,axial compressive ratio and shear span ratio on the hysteretic behaviors were analyzed.Combining strength degradation analysis which reflects the damage development process of the specimens,the Park′s damage model was adopted to assess the damage of aseismic behavior of specimens unfired and after fire.An assessment index of fire on aseismic performance damage was proposed.The results show that:the hysteretic curves and hysteretic rules of RC short columns after fire are similar to the column unfired,but the stability of RC short columns after fire is much poorer than the column unfired.The accumulated hysteretic dissipated energy of short columns decreases with increasing fire exposure time and with decreasing the axial compressive ratio and the shear span ratio.Under the same displacement angle,the strength degradation increases with increasing fire exposure time,the axial compressive ratio and the shear span ratio.There exist some disadvantages in Park′s damage model to estimate damage index of the aseismic behavior of reinforced concrete short columns before and after fire.
引文
[1]吴波.火灾后钢筋混凝土结构的力学性能[M].北京:科学出版社,2003:43,152.
[2]牛向阳,王全凤,徐玉野,等.高温后HRB高强钢筋粘结锚固性能的试验研究[J].工业建筑,2010,40(9):84-87.
[3]刘良林,王全凤,沈章春.HRB400级钢筋混凝土柱的滞回性能分析[J].华侨大学学报:自然科学版,2008,29(2):280-283.
[4]刘良林,王全凤,林煌斌.地震损伤评价的累积滞回耗能计算[J].华侨大学学报:自然科学版,2011,32(5):565-568.
[5]PARK Y J,ANG A H S.Mechanistic seismic damage model for reinforced concrete[J].Journal of Structural Engineering,1985,111(4):722-739.
[6]张家广,霍静思,肖岩.火灾全过程后钢筋混凝土柱滞回性能试验研究[C]∥第18届全国结构工程学术会议论文集:第Ⅲ册.广州:[出版者不详],2009:288-292.
[7]曾跃飞,张强.火灾后混凝土构件承载力损伤的数值分析与评估[J].广东土木与建筑,2008(4):52-54,47.
[8]吴波,李惠,马忠诚.钢筋混凝土结构在火灾和低周反复荷载作用下的损伤分析[J].哈尔滨建筑大学学报,1997,30(3):7-12.
[9]吴波,马忠诚,欧进萍.高温后钢筋混凝土柱抗震性能的试验研究[J].土木工程学报,1999,32(2):53-58.
[10]杨清文.火灾后钢筋混凝土短柱的抗震性能研究[D].泉州:华侨大学,2011:9-72.
[11]刘良林,王全凤,沈章春.基于损伤的累积滞回耗能与延性系数[J].地震,2008,28(4):13-19.
[12]刘柏权,刘鸣.钢筋混凝土柱低周疲劳试验中的强度退化与刚度退化[J].工程力学,1997,14(增刊1):189-192.
[13]中华人民共和国建设部.GB 500102012建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[2]牛向阳,王全凤,徐玉野,等.高温后HRB高强钢筋粘结锚固性能的试验研究[J].工业建筑,2010,40(9):84-87.
[3]刘良林,王全凤,沈章春.HRB400级钢筋混凝土柱的滞回性能分析[J].华侨大学学报:自然科学版,2008,29(2):280-283.
[4]刘良林,王全凤,林煌斌.地震损伤评价的累积滞回耗能计算[J].华侨大学学报:自然科学版,2011,32(5):565-568.
[5]PARK Y J,ANG A H S.Mechanistic seismic damage model for reinforced concrete[J].Journal of Structural Engineering,1985,111(4):722-739.
[6]张家广,霍静思,肖岩.火灾全过程后钢筋混凝土柱滞回性能试验研究[C]∥第18届全国结构工程学术会议论文集:第Ⅲ册.广州:[出版者不详],2009:288-292.
[7]曾跃飞,张强.火灾后混凝土构件承载力损伤的数值分析与评估[J].广东土木与建筑,2008(4):52-54,47.
[8]吴波,李惠,马忠诚.钢筋混凝土结构在火灾和低周反复荷载作用下的损伤分析[J].哈尔滨建筑大学学报,1997,30(3):7-12.
[9]吴波,马忠诚,欧进萍.高温后钢筋混凝土柱抗震性能的试验研究[J].土木工程学报,1999,32(2):53-58.
[10]杨清文.火灾后钢筋混凝土短柱的抗震性能研究[D].泉州:华侨大学,2011:9-72.
[11]刘良林,王全凤,沈章春.基于损伤的累积滞回耗能与延性系数[J].地震,2008,28(4):13-19.
[12]刘柏权,刘鸣.钢筋混凝土柱低周疲劳试验中的强度退化与刚度退化[J].工程力学,1997,14(增刊1):189-192.
[13]中华人民共和国建设部.GB 500102012建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
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