箍筋銹蝕對(duì)RC框架柱耗能能力影響研究*
鄭山鎖，王萌，胡義
- 摘 要
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（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）［摘要］在鋼筋混凝土構(gòu)件中，箍筋不僅起著鋼筋骨架的作用，而且約束構(gòu)件的橫向變形，改善其抗震性能。箍筋銹蝕后，其截面減小和力學(xué)性能變化會(huì)導(dǎo)致混凝土構(gòu)件的破壞形式從延性向脆性轉(zhuǎn)變。從約束指標(biāo)和核心區(qū)混凝土抗壓強(qiáng)度兩方面改進(jìn)約束混凝土的本構(gòu)關(guān)系，合理反映箍筋銹蝕對(duì)核心區(qū)混凝土的影響。并借助OpenSees軟件按此本構(gòu)關(guān)系添加新材料對(duì)RC框架柱進(jìn)行數(shù)值模擬，研究箍筋銹蝕對(duì)構(gòu)件耗能能力的影響。最后與縱筋銹蝕引起的粘結(jié)退化對(duì)構(gòu)件損傷的影響進(jìn)行對(duì)比，發(fā)現(xiàn)箍筋銹蝕對(duì)構(gòu)件的變形和損傷影響不可忽略。［關(guān)鍵詞］RC框架柱; 箍筋銹蝕; 約束混凝土本構(gòu)關(guān)系; 數(shù)值模擬; 耗能能力; 損傷指標(biāo)中圖分類(lèi)號(hào)：TU375.3 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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*國(guó)家科技支撐計(jì)劃(2013BAJ08B03)，國(guó)家自然科學(xué)基金（50978218，51108376），高等學(xué)校博士學(xué)科點(diǎn)專(zhuān)項(xiàng)科研基金(20106120110003)，陜西省科研項(xiàng)目(2012K12-03-01，2011KTCQ03-05)。通訊作者：王萌，碩士研究生，Email: 461670571@qq.com。參考文獻(xiàn)［1］趙志華, 杜秀林, 胡燕慧, 等. 400MPa級(jí)超細(xì)晶粒鋼的力學(xué)性能［J］. 機(jī)械工程材料, 2004, 28(10): 35-40.［2］蔣連接,袁迎曙.反復(fù)荷載下銹蝕鋼筋混凝土柱力學(xué)性的試驗(yàn)研究［J］.工業(yè)建筑,2012,42(2):66-70.［3］陳茗宇. 銹蝕箍筋混凝土壓彎構(gòu)件抗震性能試驗(yàn)與恢復(fù)力模型研究［D］. 西安: 西安建筑科技大學(xué), 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, 王傳志. 矩形箍筋約束的混凝土應(yīng)力-應(yīng)變?nèi)€研究［M］//清華大學(xué)抗震抗爆工程研究室科學(xué)研究報(bào)告集第3集：鋼筋混凝土結(jié)構(gòu)的抗震性能. 北京：清華大學(xué)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］李云貴, 呂西林, 齊虎. 箍筋約束混凝土的單軸力學(xué)性能研究［J］. 建筑結(jié)構(gòu), 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, 賈福萍, 蔡躍. 銹蝕鋼筋混凝土梁的結(jié)構(gòu)性能退化模型［J］. 土木工程學(xué)報(bào), 2001, 34(3): 47-52.［12］李楊. 鋼筋混凝土柱非線性變形分解試驗(yàn)及模擬［D］. 重慶: 重慶大學(xué), 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. 混凝土結(jié)構(gòu)中鋼筋銹蝕程度評(píng)估和預(yù)測(cè)試驗(yàn)研究［J］. 工業(yè)建筑, 1997, 27(6): 6-10.
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