Fig. 1

Geometric parameters of cracked viscoelastic beam reinforced with FRP sheet"

Fig. 2

Physical model of the standard linear solid constitutive relation of viscoelasticity"

Fig. 3

Equivalent rotation spring model of FRP sheet-reinforced crack"

Fig. 4

Responses of dimensionless mid-span deflections $W(0.5, t^*)$ vs. dimensionless time $t^*$ of CFRP sheet-reinforced cracked/intact DF beam"

Fig. 5

Distributions of dimensionless deflections $W(\xi,t^*)$ of unreinforced and $H_{2}=2.91$${\%}$ CFRP sheet-reinforced cracked/intact DF beam"

Fig. 6

Distributions of dimensionless deflections $W(\xi,t^{\ast })$ of unreinforced and $H_{2}$=2.91${\%}$ CFRP sheet-reinforced cracked DF beam under different load $Q^{\ast }$ when $t^{\ast}$=0 and 2 000"

Fig. 7

Distributions of rotational angle $\phi (\xi,t^{\ast })$ of unreinforced and $H_{2}$=2.91${\%}$ CFRP sheet-reinforced cracked DF beam under different load $Q^{\ast }$ when $t^{\ast }$=0 and $t^{\ast }$=2 000"

Fig. 8

Responses of dimensionless mid-span deflections $W(0.5,t^{\ast}$) vs. dimensionless time $t^{\ast }$ of CFRP sheet-reinforced cracked/intact DF beam"

Fig. 9

Distributions of dimensionless deflections $W(\xi ,t^{\ast }$) of CFRP sheet-reinforced cracked/intact DF beam for different dimensionless time $t^{\ast }$"

Fig. 10

Distributions of dimensionless deflections $W(\xi,t^{\ast }$) of unreinforced cracked DF beam with a top/bottom surface crack"

Fig. 11

Distributions of rotational angles $\phi (\xi,t^{\ast }$) of unreinforced and $H_{2}$=2.91${\%}$ CFRP sheet-reinforced cracked DF beam under different load $Q^{\ast }$ when $t^{\ast }$ =0 and $t^{\ast }$=2 000"

Fig. 12

Distributions of dimensionless deflection $W(\xi,t^{\ast })$ of unreinforced and CFRP sheet-reinforced cracked DF beam when $L/h_{\scriptsize\mbox{Ⅰ}}$=20 and $t^*=0$ for different $H_{2}$"