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.
引文
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