箍筋锈蚀对RC框架柱耗能能力影响研究*
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（西安建筑科技大学土木工程学院， 西安 710055）［摘要］在钢筋混凝土构件中，箍筋不仅起着钢筋骨架的作用，而且约束构件的横向变形，改善其抗震性能。箍筋锈蚀后，其截面减小和力学性能变化会导致混凝土构件的破坏形式从延性向脆性转变。从约束指标和核心区混凝土抗压强度两方面改进约束混凝土的本构关系，合理反映箍筋锈蚀对核心区混凝土的影响。并借助OpenSees软件按此本构关系添加新材料对RC框架柱进行数值模拟，研究箍筋锈蚀对构件耗能能力的影响。最后与纵筋锈蚀引起的粘结退化对构件损伤的影响进行对比，发现箍筋锈蚀对构件的变形和损伤影响不可忽略。［关键词］RC框架柱; 箍筋锈蚀; 约束混凝土本构关系; 数值模拟; 耗能能力; 损伤指标中图分类号：TU375.3 文献标识码：A 文章编号：1002-848X(2014)05-0040-05Study on influence of stirrups corrosion on energy dissipation capacity of RC frame columnZheng Shansuo, Wang Meng, Hu Yi(School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)Abstract: In the reinforced concrete components, stirrups not only play the role of reinforced skeleton, but also constraint the lateral deformation of components to improve the seismic performance. Due to the reduction of cross-section and the change of mechanical property after stirrups corrode, the failure mode of reinforced concrete components changes from ductile to brittle. The constitutive relation of constraint concrete was improved from the perspectives of constraint indicator and the compressive strength of concrete core area, reflecting how the stirrup corrosion affects the performance of concrete core area reasonably. Then with the OpenSees software, a RC frame column was simulated using a new kind of material according to the constitutive relation to study how the stirrup corrosion affects the energy dissipation capacity of components. Finally, compared with the influence on component damage caused by the bond degradation owning to longitudinal reinforcement corrosion, it is found that the effects of change of stirrup corrosion on deformation and damage of the component cannot be ignored.Keywords: RC frame column; stirrup corrosion; constitutive relation of constraint concrete; numerical simulation; energy dissipation capacity; damage indicate*国家科技支撑计划(2013BAJ08B03)，国家自然科学基金（50978218，51108376），高等学校博士学科点专项科研基金(20106120110003)，陕西省科研项目(2012K12-03-01，2011KTCQ03-05)。通讯作者：王萌，硕士研究生，Email: 461670571@qq.com。参考文献［1］赵志华, 杜秀林, 胡燕慧, 等. 400MPa级超细晶粒钢的力学性能［J］. 机械工程材料, 2004, 28(10): 35-40.［2］蒋连接,袁迎曙.反复荷载下锈蚀钢筋混凝土柱力学性的试验研究［J］.工业建筑,2012,42(2):66-70.［3］陈茗宇. 锈蚀箍筋混凝土压弯构件抗震性能试验与恢复力模型研究［D］. 西安: 西安建筑科技大学, 2012.［4］LEE H S, NOGUCHI T, TOMOSAWA F. FEM analysis for structural performance of deteriorate RC structures due to rebar corrosion［C］//Proceeding of the Second International Conference on Concrete Under Severe Conditions, Tromso Norway, 1998: 327-336.［5］林大炎, 王传志. 矩形箍筋约束的混凝土应力-应变全曲线研究［M］//清华大学抗震抗爆工程研究室科学研究报告集第3集：钢筋混凝土结构的抗震性能. 北京：清华大学出版社, 1981: 19-37.［6］MANDER J, PRIESTLEY M, PARK R. Observed stress-strain behavior of confined concrete ［J］. ASCE Structural Journal, 1988, 100(2): 215-221.［7］SAATCIOGLU M, RAZVI S. Strength and ductility of confined concrete ［J］. Journal of Structural Engineering, ASCE, 1992, 118(6): 1590-1607.［8］SAATCIOGLU M, RAZVI S. Confinement model for high-strength concrete ［J］. Journal of Structural Engineering, ASCE, 1999, 125(3):281-289.［9］李云贵, 吕西林, 齐虎. 箍筋约束混凝土的单轴力学性能研究［J］. 建筑结构, 2011, 41(1): 79-82.［10］Comit Euro-International Beton. CEB-MC1990 ECEB-FIP Model code 1990 (design code) ［S］. London: Thomas Telford Services Ltd., 1993.［11］袁迎曙, 贾福萍, 蔡跃. 锈蚀钢筋混凝土梁的结构性能退化模型［J］. 土木工程学报, 2001, 34(3): 47-52.［12］李杨. 钢筋混凝土柱非线性变形分解试验及模拟［D］. 重庆: 重庆大学, 2010.［13］MICHAEL H SCOTT, GREGORY L FENVES. Introducing a new material to Opensees ［R］. PEER: University of California, Berkeley, 2001.［14］ZHENG WENZHONG, JI JING. Dynamic performance of angle steel concrete columns under low cyclic loadingⅠ: Experimental study ［J］. Earthquake Engineering and Engineering Vibration, 2008, 7(1): 67-75.［15］惠云玲. 混凝土结构中钢筋锈蚀程度评估和预测试验研究［J］. 工业建筑, 1997, 27(6): 6-10.
