混凝土虛裂紋模型的数值模拟与计算规律的研究

The stuby of the concrete cracking Problem in FCM

本文采用虚裂纹模型(FCM)对三点弯曲梁的裂缝开裂过程及规律进行了研究。结果表明:对几何相似的梁,当选取的FCM计算参数保持关系H_1/I_(ch1)=H_2/L_(ch2),时,则由此计算的梁的P～δ曲线也相似。这样,G_c/G_F(或K_c(EG_F)^(1/2))和△α_1/H将仅是变量H/L_(ch)的函数。通过计算表明,随着H/L(ch)值的增加,G_c/G_F的值趋于1和△α_1/H的值趋于σ。分析还表明,时任意两条形状相似的软化曲线,通过它们计算几何相似的三点弯曲梁时所得到的梁的P～δ曲线仍相似。

This paper,based on the false crack models(FCM) researches the irocesses and the law of the cracks'growth of a three-oint bent beam, The result shows that the l-■ curves of the geometrically-similar three-oint bent beam calcolated by the parameters of FCM maintain- ing relation of H_1/L_(ch1)=H_2/L_(ch2) are also similara,Thus,G_c/G_F(or K_c/(EG_F)^(1/2) and △a_1/H will only be the funetion of Variable H/L_(ch). Through Calcu lation,G_c/G_F approaehes 1 and △a_1/H approaches Zero with an increase in value o...