基于鋼筋銹損截面面積的銹脹裂縫寬度計算模型
王曉剛，杜相波
- 摘 要
-
王曉剛，杜相波(煙臺大學(xué)土木工程學(xué)院, 煙臺 264005)［摘要］通過銹脹裂縫寬度預(yù)測混凝土結(jié)構(gòu)中鋼筋銹蝕程度是一種實用的非破損檢測方法。然而，針對此問題的研究采用的方法不一、參數(shù)各異，所得的結(jié)論和所建立的計算模型之間也存在較大分歧。針對大量相關(guān)研究成果進(jìn)行綜合分析發(fā)現(xiàn)，銹脹裂縫的發(fā)展與局部區(qū)域內(nèi)銹蝕產(chǎn)物的絕對生成量之間存在直接關(guān)系，銹脹裂縫寬度隨著平均銹損截面面積的增大近似成線性增大，混凝土保護(hù)層厚度和鋼筋直徑對其無明顯影響。通過銹蝕鋼筋的三維掃描建立虛擬模型，建立區(qū)段最大截面銹蝕率與平均銹蝕率的轉(zhuǎn)換關(guān)系。在此基礎(chǔ)上綜合已有自然銹蝕數(shù)據(jù)，建立了基于鋼筋平均銹損截面面積的銹脹裂縫寬度計算公式，可對實際工程銹脹混凝土構(gòu)件中的鋼筋銹蝕程度給出合理估測。［關(guān)鍵詞］混凝土； 鋼筋銹蝕； 裂縫寬度； 銹損截面面積中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002848X(2013)12005205Calculation model of expansive crack width based on crosssectional corrosion area of steel barsWang Xiaogang, Du Xiangbo(School of Civil Engineering, Yantai University, Yantai 264005, China)Abstract:It is a practical nondestructive method to assess the corrosion state of corroded concrete elements by measuring expansive cracking width. Various methods have been tried to set up the relationship between the crack width and corrosion variables. However, different variables including corrosion penetration depth, weight loss ratio and rebar section loss were introduced by different researchers, and no consistent model has been built up. Available relevant results were collected and analyzed comprehensively. Results show that evolution of expansion cracking relies mainly on the scale of corrosion in a local region and crack width increases linearly with increasing of the average crosssectional area loss. Crack width is hardly influenced by cover depth or rebar diameter. Conversion between regional maximum corrosion ratio and average corrosion ratio was achieved by virtual modeling using 3D laser scanning technology. Based on this method, available test results can be integrated to establish the relationship between expansive crack width and average crosssectional corrosion area, which is helpful in engineering.Keywords:concrete; steel bars corrosion; crack width; crosssectional corrosion area*國家自然科學(xué)基金項目（51108400），山東省優(yōu)秀中青年科學(xué)家科研獎勵基金項目（BS2010SF027）。作者簡介：王曉剛，博士，副教授，Email:wxgnet@163.com。參考文獻(xiàn)［1］WANG X G, GU X L, Strengthening of corroding reinforced concrete beams by means of CFRP laminates［J］. Restoration of Buildings and Monuments, 2010, 16(1): 4756.［2］BHARGAVA K, GHOSH A K, MORI Y, et al. Analytical model for time to cover cracking in RC structure due to rebar corrosion［J］. Nuclear Engineering and Design, 2006, 236(11): 11231139.［3］ZHENG J J, LI C Q, LAWANWISUT W. Crack width due to corroded bar in reinforced concrete structures［J］. International Journal of Materials & Structural Reliability, 2005, 3(2): 8794.［4］KIANI K, SHODJA M H. Prediction of the penetrated rust into the microcracks of concrete caused by reinforcement corrosion［J］. Applied Mathematical Modelling, 2011,35(5): 25292543.［5］王巧平, 吳勝興. 銹裂混凝土裂縫開展的模擬試驗研究［J］. 混凝土與水泥制品, 2006(5): 1618.［6］MOLINA F J, ALONSO C, ANDRADE C. Cover cracking as a function of rebar corrosion: part 2─numerical model［J］. Materials and Structures, 1993, 163(26): 532548.［7］ZHAO Y X, YU J, HU B Y, JIN W L. Crack shape and rust distribution in corrosioninduced cracking concrete［J］. Corrosion Science, 2012, 55: 385393.［8］ALONSO C, ANDRADE C, RODRIGUEZ J, et al. Factors controlling cracking of concrete affected by reinforcement corrosion［J］. Material and Structures, 1998, 31(8): 435441.［9］施志業(yè), 鄭建軍, 周欣竹. 混凝土保護(hù)層銹脹裂縫擴(kuò)展規(guī)律試驗研究［J］. 甘肅水利水電技術(shù), 2010,46(3):1618.［10］MULLARD A J, STEWART G M. Corrosioninduced cracking: new experimental data and predictive model［J］. ACI Structural Journal, 2011, 108(1): 7179.［11］VIDAL T, CASTEL A, FRANCOIS R. Analyzing crack width to predict corrosion in reinforced concrete［J］. Cement and Concrete Research， 2004, 34(1): 165174.［12］ZHANG R J, CASTEL A, FRANCOIS R. Concrete cover cracking with reinforcement corrosion of RC beam during chlorideinduced corrosion process［J］. Cement and Concrete Research, 2010(40): 415425.［13］RODRIGUEZ J, ORTEGA L M, CASAL J, et al. Corrosion of reinforcement and service life of concrete structures［J］. Durability of Building Materials and Components, 1996, 7(1): 117126.［14］GONZALEZ J A, ANDRADE C, ALONSO C, et al. Comparison of rates of general corrosion and maximum pitting generation on concrete embedded steel reinforcement［J］. Cement and Concrete Research, 1995, 25(2): 257264.［15］袁立群. 混凝土結(jié)構(gòu)銹脹裂縫分析與鋼筋銹蝕預(yù)測研究［D］. 西安：西安建筑科技大學(xué), 2007.
- 下載地址
-
