混凝土裂缝断裂全过程受黏聚力分布的影响分析
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摘要
本文给出基于起裂韧度准则并考虑黏聚力作用的混凝土裂缝断裂全过程的分析方法。计算得到楔入劈拉试件裂缝起裂至扩展的P-CMOD全过程曲线。结合现有混凝土断裂试验成果,分析了不同黏聚力分布模型对混凝土裂缝断裂全过程计算结果的影响规律。结果表明:不同黏聚力分布模型对全曲线下降段的影响较大,但对峰值荷载和临界裂缝嘴张开位移的影响较小。
A method for simulating the whole fracture process of concrete has been developed and it is able to consider the criterion initial fracture toughness and cohesive stress. Taking the wedge-splitting specimen as an example, the corresponding crack propagation P-CMOD curve was obtained. Based on the existing experimental data, the effects of cohesive distribution on the whole fracture process were further analyzed. The results show that the whole process of the P-CMOD curve is affected by the cohesive force distribution, especially by the descending segment of the curve, while the peak load and critical crack mouth opening displacement are less affective.
A method for simulating the whole fracture process of concrete has been developed and it is able to consider the criterion initial fracture toughness and cohesive stress. Taking the wedge-splitting specimen as an example, the corresponding crack propagation P-CMOD curve was obtained. Based on the existing experimental data, the effects of cohesive distribution on the whole fracture process were further analyzed. The results show that the whole process of the P-CMOD curve is affected by the cohesive force distribution, especially by the descending segment of the curve, while the peak load and critical crack mouth opening displacement are less affective.
引文
[1]李庆斌,周鸿钧,林皋.异弹模界面裂缝的动断裂分析[J].地震工程与工程振动,1990,10(4):63-72.
[2]李庆斌,周鸿钧,林皋,等.异弹模界面裂缝地震断裂分析的特解边界元法及在重力坝中的应用[J].水利学报,1993(8):77-81.
[3]李庆斌,张楚汉,王光纶.混凝土Ⅰ型裂缝动静力损伤断裂分析[J].土木工程学报,1993,26(6):20-27.
[4]Kaplan M F.Crack propagation and the fracture of concrete[J].ACI Journal Proceedings,1961,58(5):591-609.
[5]Jenq Y S,Shah S P.Two Parameter fracture model for concrete[J].Journal of Engineering Mechanics,1985,111(10):1227-1241.
[6]Bazant Z P.Size effect in blunt fracture:concrete,rock,metal[J].Journal of Engineering Mechanics,1984,110(4):518-535.
[7]Karihaloo B L,Nallathambi P.Effective cracks model for the determination of fracture toughness of conerete[J].Engeering Fracture Mechanics,1990(4/5):637-645.
[8]Hillerborg A,Modeer M,Petersson P E.Analysis of crack formation crack growth in concrete by means of frac ture mechanics and finite elements[J].Cement and Concrete Research,1976,6(6):773-782.
[9]李庆斌,张楚汉,王光纶.用虚拟裂缝模型研究混凝土裂缝扩展的边界单元法[J].工程力学,1993,10(3):9-16.
[10]Xu S L,Reinhardt H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture PartⅠ:experimental investigation of crack propagation[J].International Journal of Fracture,1999,98:111-149.
[11]吴智敏,董伟,刘康,等.混凝土Ⅰ型裂缝扩展准则及裂缝扩展全过程的数值模拟[J].水利学报,2007,38(12):46-52.
[12]Reinhardt H W.Plain concrete modeled as an elastic strain-softening material at fracture[J].Engineering Frac ture Mechanics,1985,22(5):787-796.
[13]Paris P C,Erdogan F.A critical analysis of crack propagation laws[J].Journal of Basic Engineering,1963,85:528-534.
[14]Xu S L,Reinhardt H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture,PartⅢ:Compact tension specimens and wedge splitting specimens[J].International Journal of Fracture,1999,98:179-193.
[15]Reinhardt H W,Cornelissen H A W,Hordijk D A.Tensile tests and failure analysis of concrete[J].Journal of Structural Engineering,1986,112(11):2462-2477.
[16]吴智敏.混凝土Ⅰ型裂缝静、动态断裂特性的试验研究[D].大连:大连理工大学,1994.
[17]吴智敏,徐世烺,王金来.基于虚拟裂缝模型的混凝土双K断裂参数[J].水利学报,1999(7):12-16.
[2]李庆斌,周鸿钧,林皋,等.异弹模界面裂缝地震断裂分析的特解边界元法及在重力坝中的应用[J].水利学报,1993(8):77-81.
[3]李庆斌,张楚汉,王光纶.混凝土Ⅰ型裂缝动静力损伤断裂分析[J].土木工程学报,1993,26(6):20-27.
[4]Kaplan M F.Crack propagation and the fracture of concrete[J].ACI Journal Proceedings,1961,58(5):591-609.
[5]Jenq Y S,Shah S P.Two Parameter fracture model for concrete[J].Journal of Engineering Mechanics,1985,111(10):1227-1241.
[6]Bazant Z P.Size effect in blunt fracture:concrete,rock,metal[J].Journal of Engineering Mechanics,1984,110(4):518-535.
[7]Karihaloo B L,Nallathambi P.Effective cracks model for the determination of fracture toughness of conerete[J].Engeering Fracture Mechanics,1990(4/5):637-645.
[8]Hillerborg A,Modeer M,Petersson P E.Analysis of crack formation crack growth in concrete by means of frac ture mechanics and finite elements[J].Cement and Concrete Research,1976,6(6):773-782.
[9]李庆斌,张楚汉,王光纶.用虚拟裂缝模型研究混凝土裂缝扩展的边界单元法[J].工程力学,1993,10(3):9-16.
[10]Xu S L,Reinhardt H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture PartⅠ:experimental investigation of crack propagation[J].International Journal of Fracture,1999,98:111-149.
[11]吴智敏,董伟,刘康,等.混凝土Ⅰ型裂缝扩展准则及裂缝扩展全过程的数值模拟[J].水利学报,2007,38(12):46-52.
[12]Reinhardt H W.Plain concrete modeled as an elastic strain-softening material at fracture[J].Engineering Frac ture Mechanics,1985,22(5):787-796.
[13]Paris P C,Erdogan F.A critical analysis of crack propagation laws[J].Journal of Basic Engineering,1963,85:528-534.
[14]Xu S L,Reinhardt H W.Determination of double-K criterion for crack propagation in quasi-brittle fracture,PartⅢ:Compact tension specimens and wedge splitting specimens[J].International Journal of Fracture,1999,98:179-193.
[15]Reinhardt H W,Cornelissen H A W,Hordijk D A.Tensile tests and failure analysis of concrete[J].Journal of Structural Engineering,1986,112(11):2462-2477.
[16]吴智敏.混凝土Ⅰ型裂缝静、动态断裂特性的试验研究[D].大连:大连理工大学,1994.
[17]吴智敏,徐世烺,王金来.基于虚拟裂缝模型的混凝土双K断裂参数[J].水利学报,1999(7):12-16.
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