箍筋銹蝕混凝土棱柱體試件軸心受壓試驗研究*
李強，牛荻濤，劉磊，王慶霖
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李強，牛荻濤，劉磊，王慶霖（西安建筑科技大學土木工程學院， 西安 710055）［摘要］通過電化學方法對方形箍筋約束混凝土棱柱體試件內(nèi)箍筋進行了實驗室加速腐蝕試驗，得到了箍筋銹蝕程度不同的銹蝕試件，并進一步開展了箍筋銹蝕混凝土棱柱體試件的軸壓試驗，研究了箍筋銹蝕對混凝土棱柱體試件破壞形態(tài)的影響，分析了箍筋銹蝕造成的混凝土損傷。試驗結(jié)果表明：箍筋在角部銹蝕嚴重，混凝土保護層銹脹裂縫在角部沿豎向發(fā)展，且隨著銹蝕程度的增加，裂縫寬度加大；銹蝕產(chǎn)物在混凝土保護層與核心區(qū)混凝土界面上的堆積，降低了混凝土保護層對構(gòu)件承載力的貢獻；箍筋銹蝕程度對試件的裂縫發(fā)展速度、破壞形態(tài)均有影響，箍筋銹蝕越嚴重，裂縫發(fā)展越迅速，核心混凝土的破壞程度愈大，斜向破壞面愈明顯，混凝土試件的破壞形式從延性破壞向脆性破壞轉(zhuǎn)變。［關(guān)鍵詞］箍筋銹蝕；約束混凝土；軸心受壓；混凝土損傷中圖分類號：TU375.3 文獻標識碼：A 文章編號：1002-848X(2013)01-0065-04Experimental study on reinforced concrete prism specimens confined by corroded stirrupsLi Qiang, Niu Ditao, Liu Lei, Wang Qinglin(School of Civil Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China)Abstract: The corroded reinforced concrete prism specimens confined by the square stirrups, which were subjected to accelerated corrosion, were obtained. The axial compressive test of the corroded reinforced concrete prism specimens and contrasted uncorroded reinforced concrete prism specimens was carried further. The effect of corrosion of stirrups on the deterioration form of reinforced concrete prism specimens and the concrete damage were analyzed. The results of axial compressive test show that, the corners of stirrups are corroded very seriously and the cracks of the protective layer are developed along the vertical direction at the corner of the reinforced concrete prism specimens, cracks widthes increase with the increase of corrosion degree. The “piling up” of corrosion products between the concrete cover and the core concrete zone reduces its contribution to the capacity of reinforced concrete prism specimens. The corrosion rate of stirrups has influenced directly on the development speed of cracks and the damage mode. The growth of cracks speeds up, the damage of the core concrete is more serious, the destroy incline section is more obvious and the deterioration form of the samples shift from ductile failure to the brittle failure, as the amount of stirrups corrosion grows.Keywords: stirrups corrosion; confined concrete; axial compression; concrete damage* 國家杰出青年科學基金項目（50725824），陜西省“13115”科技創(chuàng)新工程項目（2010ZDKG55）作者簡介：李強，博士，Email：liguanqiang2005@126.com參考文獻［1］劉西拉.重大土木與水利工程安全性及耐久性的基礎(chǔ)性研究［J］.土木工程學報,2001,34(6): 1-4.［2］惠云玲,林志伸,李榮.銹蝕鋼筋性能試驗研究分析［J］.工業(yè)建筑,1997,27(6):10-13,33．［3］張偉平,商登峰,顧祥林. 銹蝕鋼筋應(yīng)力應(yīng)變關(guān)系研究［J］. 同濟大學學報：自然科學版,2006,34(5):106-242.［4］楊亞東.鋼筋腐蝕混凝土構(gòu)件的性能退化與可靠性分析［D］.西安：西安建筑科技大學,2000.［5］顏桂云.銹蝕鋼筋混凝土壓彎構(gòu)件恢復力性能的試驗研究與承載力的理論分析［D］.西安：西安建筑科技大學,2001.［6］王學民.銹蝕鋼筋混凝土構(gòu)件抗震性能試驗與恢復力模型研究［D］. 西安：西安建筑科技大學,2003.［7］RODRIGUEZ J, ORTEGA L M, CASAL J. Load bearing capacity of concrete columns with corroded reinforcement［C］//Corrosion of Reinforcement in Concrete Construction. London: Ove Arup and Partners,1996:220-230.［8］史慶軒,李小健,牛荻濤.鋼筋銹蝕前后混凝土偏心受壓構(gòu)件承載力試驗研究［J］.西安建筑科技大學學報：自然科學版,1999,31(3):218-221.［9］閻培渝,游秩, 崔路,等.高含氯混凝土中鋼筋宏電池腐蝕速率控制因素［J］.工業(yè)建筑,2005,30(5):6-9.［10］TAMER A, KHALED 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.［11］CHRISTOPHER HIGGINS, WILLIAM C FARROW III. Tests of reinforced concrete beams with corrosion damaged stirrups［J］. ACI Structural Journal, 2006, 103(1) : 133-141.［12］宋華,牛荻濤.電化學快速銹蝕與自然環(huán)境鋼筋銹蝕的相似性分析［J］.西安建筑科技大學學報：自然科學版, 2009,41(4):508-511.第43卷 第1期2013年1月上建筑結(jié)構(gòu)Building StructureVol.43 No.1Jan. 2013
