钢筋混凝土桥墩地震弯剪破坏机理与震后快速修复技术研究  

Study on the seismic flexural-shear damage mechanisms and rapid repair techniques for earthquake damaged bridge piers

作　　者：司炳君[1] 孙治国[2] 杜修力[3] 王东升[2] 黄照南[1] 

机构地区：[1]大连理工大学,辽宁大连116024 [2]大连海事大学,辽宁大连116026 [3]北京工业大学,北京100022

出　　处：《土木工程学报》2011年第7期90-99,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(50978042);地震行业科技专项(200808021);城市与工程安全减灾省部共建教育部重点实验室开放基金(EESR2008-02)

摘　　要：为研究钢筋混凝土桥墩的地震弯剪破坏机理与震后快速修复技术,首先进行了6个圆形截面桥墩试件的拟静力试验,试件均发生严重弯剪破坏,然后利用高流动性早强混凝土和CFRP布对其进行快速修复并在1周内重新进行加载试验,将原桥墩与修复后试件的破坏形态、承载力、延性与耗能能力、刚度退化等进行了对比分析。研究表明:塑性铰区配箍满足我国《公路桥梁抗震设计细则》(JTG/T B02-01—2008)及美国Caltrans规范要求的钢筋混凝土桥墩试件,最终仍有可能因塑性铰区抗剪强度不足发生弯剪破坏。由于初始损伤的存在,震后修复桥墩试件的初始刚度偏低、屈服位移偏大,但极限承载力较原试件均有不同程度的提高,延性与耗能能力达到或超过原试件,刚度可有效恢复至原桥墩试件水平,震后修复试件呈弯曲破坏形态,显示出修复方法的有效性。Quasi-static tests were conducted to study the seismic flexural-shear damage mechanisms and rapid repair techniques for earthquake damaged bridge piers.Six original pier specimens of circular cross sections were severely damaged under cyclic lateral force and constant axial load,and the damaged specimens were subsequently repaired using high-fluidity concrete with high early-strength and Carbon Fiber-Reinforced Polymer（CFRP）,and then put into test again within a week.The failure pattern,strength,ductility and dissipated energy parameters and stiffness degradation of the repaired specimens were compared with the original ones.It is founded that the ultimate performance of bridge piers designed according to current seismic design codes of JTG/T B02-01—2008 and Caltrans with minimum confining reinforcement ratios may be dominated by shear failure in the plastic hinge zones.The repaired specimens show lower initial stiffness and larger yield displacement as a result of the pre-existing damage.But the failure for all of the repaired specimens was due to flexure,with higher strength,larger or the same ductility and dissipated energy parameters and recovered stiffness,which demonstrated the effectiveness of the proposed repair techniques.

关 键 词：钢筋混凝土桥墩 弯剪破坏 震后快速修复 CFRP 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]