|
|
|
| Effect of stirrup corrosion on bearing capacity of uniaxial compression short column |
| LI Qiang1,2, JIN Xian yu1 |
| 1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2. Zhejiang College of Construction, Hangzhou 311231, China |
|
|
|
Abstract Load bearing capacity test was conducted on the reinforced short concrete columns with stirrup being corroded by impressed current method in order to analyze the effect of corrosion of stirrups on load bearing capacity of short concrete column under uniaxial compression. Results showed that the ultimate bearing capacity was decreased and the slope of load displacement curve was decreased with the increase of stirrup corrosion. The failure of the column presents more obvious brittle characteristics with the increase of stirrup corrosion. The spring of the variable stiffness was adopted to simulate the constraints of stirrups to reinforcement. The load bearing capacity model of uniaxial short column considering the concrete cover spalling, reduction of concrete strength and supporting role of stirrup to longitudinal reinforcement caused by corrosion stirrup was established. The average ratio of prediction results to test results is 0.955.
|
|
Published: 29 October 2015
|
|
|
箍筋锈蚀对轴压混凝土短柱承载力的影响
为了研究箍筋锈蚀对轴压混凝土短柱承载力的影响, 对采用外加电流法获得的仅箍筋锈蚀的钢筋混凝土短柱进行轴压承载力试验.结果表明: 随着箍筋锈蚀率的增大, 柱的极限承载力降低, 荷载 纵向位移曲线的斜率减小.随着箍筋锈蚀程度的加重, 柱的脆性破坏特征更加明显.采用变刚度的弹簧模拟箍筋锈蚀区段内箍筋对主筋的约束, 建立考虑箍筋锈蚀引起的保护层剥落、箍筋对混凝土的约束能力降低、箍筋对主筋的支撑作用降低等因素的箍筋锈蚀轴压混凝土短柱承载力模型.模型计算值与试验值之比的平均值为0.955.
|
|
| ［1］ GONZLEZ J A, FELIU S, RODRIQUEZ P, et al. Some questions on the corrosion of steel in concrete. Part II: corrosion mechanism and monitoring, service life prediction and protection methods ［J］. Materials and Structures, 1996, 29(2): 97-104.
［2］ 金伟良,吕清芳,潘仁泉.东南沿海公路桥梁耐久性现状［J］.江苏大学学报：自然科学版, 2007, 28(3): 254-257.
JIN Wei liang, LV Qing fang, PAN Ren quan. Current durability situation of concrete highway bridge structures in southeast coastal areas ［J］. Journal of Jiangsu University: Natural Science Edition, 2007, 28(3): 254-257.
［3］ 史庆轩,李小健,牛荻涛.钢筋锈蚀前后混凝土偏心受压构件承载力试验研究［J］.西安建筑科技大学学报：自然科学版,1999, 31(3): 218-221.
SHI Qing xuan, LI Xiao jian, NIU Di tao. Tentative study on the bearing capacity of R.C. eccentric compressive members before and after reinfocement corrosion ［J］. Xi’an University of Architecture and Technology: Natural Science, 1999, 31(3): 218-221.
［4］ TAPAN M, ABOUTAHA R S. Effect of steel corrosion and loss of concrete cover on strength of deteriorated RC columns ［J］. Construction and Building Materials, 2011, 25(5): 2596-2603.
［5］ TAPAN M, ABOUTAHA R S. Strength evaluation of deteriorated RC bridge columns［J］. Journal of Bridge Engineering, 2008, 13(3): 226-236.
［6］ WANG X H, LIANG F Y. Performance of RC columns with partial length corrosion ［J］. Nuclear Engineering and Design, 2008, 238(12): 3194-3202.
［7］ 袁迎曙,李果.锈蚀钢筋混凝土柱的结构性能退化特征［J］.建筑结构,2002, 32(10):18-20.
YUAN Ying shu, LI Guo. Structure performance degradation characteristics of corroded reinforced concrete column ［J］. Building Structures, 2002, 32(10): 18-20.
［8］ 雷国强.锈蚀钢筋混凝土偏心受压柱承载力试验研究［D］.长沙：湖南大学, 2007.
LI Guo qiang. Experimental research on the carryingcapacity of corroded R.C. columns ［D］. Changsha: Hunan University, 2007.
［9］ 刘磊,牛荻涛.锈蚀箍筋约束混凝土短柱轴心受压性能试验研究［J］.建筑结构, 2011, 41(增2）: 159-161.
LIU Lei, NIU Di tao. Experimental study on axial compressive performance of corroded stirrups confined columns ［J］. Building Structure, 2011, 41（Suppl.2):159161.
［10］ 蒋凤昌,朱慈勉.混凝土柱中箍筋锈蚀影响纵筋压屈行为分析［J］.东南大学学报:自然科学版, 2008, 38(2): 279-282.
JIANG Feng chang, ZHU Ci mian. Analysis of buckling behavior of longitudinal bars affected by stirrup corrosion in concrete columns ［J］. Journal of Southeast University: Natural Science Edition, 2008, 38(2):279-282.
［11］ EL MAADDAWY T A, SOUDKI K A. Effectiveness of impressed current technique to simulate corrosion of steel reinforcement in concrete ［J］. Journal of Materials in Civil Engineering, 2003, 15(1): 41-47.
［12］ 王雪松,金贤玉,田野.开裂混凝土中钢筋加速锈蚀方法适用性［J］.浙江大学学报：工学版, 2013, 47(4): 565-574.
WANG Xue song, JIN Xian yu, TIAN Ye. Applicability of accelerated corrosion method of steel bars in cracked concrete structure ［J］. Journal of Zhejiang University: Engineering Science, 2013, 47(4): 565-574.
［13］ 张伟平,尚登峰,顾祥林.锈蚀钢筋应力—应变关系研究［J］.同济大学学报,2006, 34(5): 586-592.
ZHANG Wei ping, SHANG Deng feng, GU Xiang lin.Stress strain relationship of corroded steel bars ［J］. Journal of Tongji University, 2006, 34(5): 586-592.
［14］ SHEIKH S A, U ZUMERIS M. Analytical model for concrete confinement in tied columns ［J］. ASCE Journal of Structural Division, 1982, 108(12): 2703-2722.
［15］ MANDER J B, PRIESTLY M J N, PARK R. Theoretical stress strain model for confined concrete ［J］. Journal of Structural Engineering, ASCE, 1988,114(8): 1804-1826.
［16］ 钱稼茹,程丽荣，周栋梁.普通箍筋约束混凝土柱的中心受压性能［J］.清华大学学报:自然科学版, 2002, 42(10): 1369-1373.
QIAN Jia ru, CHENG Li rong, ZHOU Dong liang. Behavior of axially loaded concrete columns confined with ordinary hoops ［J］. Journal of Tsinghua University: Natural Science, 2002, 42(10): 1369-1373.
［17］ DU Y G, CLARK L A, CHAN A H C. Residualcapacity of corroded reinforcing bars ［J］. Magazine of Concrete Research, 2005, 57(3): 135-147.
［18］ CAMPIONE G, MINAF(G. Compressive behavior of short high strength concrete columns ［J］. Engineering Structures, 2010, 32(9): 2755-2766.
［19］ SATO Y, KO H. Modeling of reinforcement buckling in RC columns confined with FRP ［J］. Journal of Advanced Concrete Technology, 2008, 6(1): 195-204.
［20］ 陈骥.钢结构稳定理论与设计［M］.北京:科学出版社,2001: 427-428.
［21］ 蒋凤昌.锈蚀钢筋混凝土柱承载力试验研究［D］.上海: 同济大学, 2008.
JIANG Feng chang. Experimental study on the load carrying capacity of corroded reinforced concrete columns ［D］. Shanghai: TongJi University, 2008.
［22］ 张雯.锈蚀箍筋约束混凝土力学性能退化数值模拟分析［D］.西安：西安建筑科技大学, 2012.
ZHANG Wen. Analysis the corrosion stirrups confined concrete performance degradation of numerical simulation ［D］. Xi’an: Xi’an University of Architecture and Technology, 2012. |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
