粘钢加固损伤混凝土箱型桥墩的抗震性能Ⅰ:双向拟静力试验
|
摘要
设计制作了11个钢筋混凝土箱型截面桥墩缩尺模型,对其进行了粘钢加固后的双向拟静力试验,分析了加固桥墩的荷载-位移滞回曲线、骨架曲线、延性能力、刚度退化和耗能能力等.结果表明,加固墩柱均发生以弯曲破坏为主的延性破坏,破坏塑性铰由未加固时的墩底上移至加固钢板位置的上边缘,加固后墩柱各项抗震性能良好,表明粘钢加固损伤桥墩是一种有效的抗震加固方式.墩柱强轴方向的滞回环饱满,承载力和刚度较大;弱轴方向的滞回环捏缩效应显著,耗能能力较强.初始损伤程度仅对粘钢加固墩柱的刚度退化及耗能能力具有一定影响.随着轴压比的增大,加固试件的承载力变大,极限变形能力降低,延性能力和耗能能力均增强.而随着长细比的减小,加固试件的承载力变大,极限变形能力降低,刚度退化情况严重.
11 scaled models of reinforced concrete bridge piers with hollowbox-section were designed and fabricated in the lab.Bi-directional quasi-static tests for these scaled pier models strengthened with adhering steel plates were carried out.Several seismic performance indicators,such as load-displacement hysteretic and skeleton curves,ductility,degradation of rigidity,and energy dissipation were investigated.The experimental results showthat all the strengthened piers present typical flexural failure modes,and plastic hinge appears in the superior margin of steel plates in stead of in the bottom for piers without strengthening.The improvement of anti-seismic properties exhibits that it was an effective method to change the plastic hinge position by adhering steel plates.The load capacity and the lateral rigid along the strong axis direction are greater,while the energy dissipation along the weak axis direction is stronger.The hysteretic curves of the weak axis exhibit notable pinch effects.The initial damage only has small effect on the degradation of rigidity and energy dissipation of the strengthening piers.Meanwhile,the changes of axial compression ratio and slenderness ratio have a great impact on the seismic performance.With the increase of the axial compression ratio,the carrying capacity,the ductility performance and energy dissipation of models increase,but the ultimate displacement decreases.With the decrease of the slenderness ratio,the carrying capacity of piers strengthened with adhering steel plates increases;however the ultimate deformation capacity decreases,while the degradation of rigidity becomes more serious.
11 scaled models of reinforced concrete bridge piers with hollowbox-section were designed and fabricated in the lab.Bi-directional quasi-static tests for these scaled pier models strengthened with adhering steel plates were carried out.Several seismic performance indicators,such as load-displacement hysteretic and skeleton curves,ductility,degradation of rigidity,and energy dissipation were investigated.The experimental results showthat all the strengthened piers present typical flexural failure modes,and plastic hinge appears in the superior margin of steel plates in stead of in the bottom for piers without strengthening.The improvement of anti-seismic properties exhibits that it was an effective method to change the plastic hinge position by adhering steel plates.The load capacity and the lateral rigid along the strong axis direction are greater,while the energy dissipation along the weak axis direction is stronger.The hysteretic curves of the weak axis exhibit notable pinch effects.The initial damage only has small effect on the degradation of rigidity and energy dissipation of the strengthening piers.Meanwhile,the changes of axial compression ratio and slenderness ratio have a great impact on the seismic performance.With the increase of the axial compression ratio,the carrying capacity,the ductility performance and energy dissipation of models increase,but the ultimate displacement decreases.With the decrease of the slenderness ratio,the carrying capacity of piers strengthened with adhering steel plates increases;however the ultimate deformation capacity decreases,while the degradation of rigidity becomes more serious.
引文
[1]李乔,赵世春.汶川大地震工程震害分析[M].成都:西南交通大学出版社,2008.
[2]庄卫林,刘振宇,蒋劲松.5.12汶川地震公路桥梁震害分析及对策研究[J].公路,2009(5):129-138.Zhuang Weilin,Liu Zhenyu,Jiang Jinsong.The 5.12Wenchuan earthquake damage analysis and countermeas-ures of highway bridges[J].Highway,2009(5):129-138.(in Chinese)
[3]Fahmy M,Wu Z S,Wu G.Post-earthquake recover-ability of existing RC bridge piers retrofitted with FRPcomposites[J].Construction and Building Materials,2010,24(6):980-998.
[4]单波,肖岩.FRP加固钢筋混凝土柱经历模拟地震作用后的残余性能试验研究[J].建筑结构学报,2008,29(3):111-119.Shan Bo,Xiao Yan.Long-term residual behavior ofFRP retrofitted RC columns after damaged by simulatedearthquake loading[J].Journal of Building Structures,2008,29(3):111-119.(in Chinese)
[5]刘保东,牛晓斐,王建兵.FRP加固钢筋混凝土桥墩的抗震性能分析[J].工程抗震与加固改造,2006,28(6):85-89.Liu Baodong,Niu Xiaofei,Wang Jianbing.Earthquakeresistant behavior of reinforced concrete piers strength-ened with FRP[J].Earthquake Resistant Engineeringand Retrofitting,2006,28(6):85-89.(in Chinese)
[6]郭子雄,张杰,杨勇.设置外包预应力钢板箍RC短柱抗震性能研究[J].哈尔滨工业大学学报,2006,38(1):140-144.Guo Zixiong,Zhang Jie,Yang Yong.Study on theseismic performance of RC column confined by pres-tressed steel plate hoops[J].Journal of Harbin Instituteof Technology,2006,38(1):140-144.(in Chinese)
[7]Solberg K,Mashiko N,Mander J B,et al.Perform-ance of a damage-protected highway bridge pier subjec-ted to bidirectional earthquake attack[J].Journal ofStructural Engineering,ASCE,2009,135(5):469-478.
[8]Wright T,Desroches R,Padgett J E.Bridge seismicretrofitting practices in the central and southeastern Unit-ed States[J].Journal of Bridge Engineering,ASCE,2011,16(1):82-92.
[9]宋晓东.桥梁高墩延性抗震性能的理论与试验研究[D].上海:同济大学土木工程学院,2004.
[10]袁晓静.钢筋混凝土柔性墩柱的抗震性能试验研究[D].苏州:苏州科技学院土木工程学院,2008.
[11]崔海琴,贺拴海,宋一凡.空心矩形薄壁墩延性抗震性能试验[J].公路交通科技,2010,27(6):58-63.Cui Haiqin,He Shuanhai,Song Yifan.Experimentalstudy on anti-seismic ductility of hollow rectangularthin-walled pier[J].Journal of Highway and Trans-portation Research and Development,2010,27(6):58-63.(in Chinese)
[12]宗周红,陈树辉,夏樟华.钢筋混凝土箱型高墩双向拟静力试验研究[J].防灾减灾工程学报,2010,30(4):369-374.Zong Zhouhong,Chen Shuhui,Xia Zhanghua.Bi-axi-al quasi-static testing research of high hollow reinforcedconcrete piers[J].Journal of Disaster Prevention andMitigation Engineering,2010,30(4):369-374.(inChinese)
[13]Mo Y L,Yeh Y K,Hsieh D M.Seismic retrofit ofhollow rectangular bridge columns[J].Journal ofComposites for Construction,2004,8(1):43-51.
[14]Lignola G P,Prota A,Manfredi G,et al.Experimen-tal performance of RC hollow columns confined withCFRP[J].Journal of Composites for Construction,ASCE,2007,11(1):42-49.
[15]闻邦椿.机械设计手册[M].5版.北京:机械工业出版社,2010.
[16]中华人民共和国国家标准.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.
[2]庄卫林,刘振宇,蒋劲松.5.12汶川地震公路桥梁震害分析及对策研究[J].公路,2009(5):129-138.Zhuang Weilin,Liu Zhenyu,Jiang Jinsong.The 5.12Wenchuan earthquake damage analysis and countermeas-ures of highway bridges[J].Highway,2009(5):129-138.(in Chinese)
[3]Fahmy M,Wu Z S,Wu G.Post-earthquake recover-ability of existing RC bridge piers retrofitted with FRPcomposites[J].Construction and Building Materials,2010,24(6):980-998.
[4]单波,肖岩.FRP加固钢筋混凝土柱经历模拟地震作用后的残余性能试验研究[J].建筑结构学报,2008,29(3):111-119.Shan Bo,Xiao Yan.Long-term residual behavior ofFRP retrofitted RC columns after damaged by simulatedearthquake loading[J].Journal of Building Structures,2008,29(3):111-119.(in Chinese)
[5]刘保东,牛晓斐,王建兵.FRP加固钢筋混凝土桥墩的抗震性能分析[J].工程抗震与加固改造,2006,28(6):85-89.Liu Baodong,Niu Xiaofei,Wang Jianbing.Earthquakeresistant behavior of reinforced concrete piers strength-ened with FRP[J].Earthquake Resistant Engineeringand Retrofitting,2006,28(6):85-89.(in Chinese)
[6]郭子雄,张杰,杨勇.设置外包预应力钢板箍RC短柱抗震性能研究[J].哈尔滨工业大学学报,2006,38(1):140-144.Guo Zixiong,Zhang Jie,Yang Yong.Study on theseismic performance of RC column confined by pres-tressed steel plate hoops[J].Journal of Harbin Instituteof Technology,2006,38(1):140-144.(in Chinese)
[7]Solberg K,Mashiko N,Mander J B,et al.Perform-ance of a damage-protected highway bridge pier subjec-ted to bidirectional earthquake attack[J].Journal ofStructural Engineering,ASCE,2009,135(5):469-478.
[8]Wright T,Desroches R,Padgett J E.Bridge seismicretrofitting practices in the central and southeastern Unit-ed States[J].Journal of Bridge Engineering,ASCE,2011,16(1):82-92.
[9]宋晓东.桥梁高墩延性抗震性能的理论与试验研究[D].上海:同济大学土木工程学院,2004.
[10]袁晓静.钢筋混凝土柔性墩柱的抗震性能试验研究[D].苏州:苏州科技学院土木工程学院,2008.
[11]崔海琴,贺拴海,宋一凡.空心矩形薄壁墩延性抗震性能试验[J].公路交通科技,2010,27(6):58-63.Cui Haiqin,He Shuanhai,Song Yifan.Experimentalstudy on anti-seismic ductility of hollow rectangularthin-walled pier[J].Journal of Highway and Trans-portation Research and Development,2010,27(6):58-63.(in Chinese)
[12]宗周红,陈树辉,夏樟华.钢筋混凝土箱型高墩双向拟静力试验研究[J].防灾减灾工程学报,2010,30(4):369-374.Zong Zhouhong,Chen Shuhui,Xia Zhanghua.Bi-axi-al quasi-static testing research of high hollow reinforcedconcrete piers[J].Journal of Disaster Prevention andMitigation Engineering,2010,30(4):369-374.(inChinese)
[13]Mo Y L,Yeh Y K,Hsieh D M.Seismic retrofit ofhollow rectangular bridge columns[J].Journal ofComposites for Construction,2004,8(1):43-51.
[14]Lignola G P,Prota A,Manfredi G,et al.Experimen-tal performance of RC hollow columns confined withCFRP[J].Journal of Composites for Construction,ASCE,2007,11(1):42-49.
[15]闻邦椿.机械设计手册[M].5版.北京:机械工业出版社,2010.
[16]中华人民共和国国家标准.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.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心