Comparative study of models predicting punching shear capacity of strengthened corroded RC slab-column joints

Figures & data

Table 1. Details of the experimental specimens used for verification.

Ref	ID	Dimensions (m)	Column size (mm)	d (mm)	(MPa)	Bottom reinforcement (mm)	ρ (%)	Targeted corrosion degree (%)
Quin et al.[2]	S-N	0.7 × 0.7 × 0.1	150	85	24.0	T10@113	0.92	0
	S-L	0.7 × 0.7 × 0.1	150	85	24.0	T10@113	0.92	5
	S-M	0.7 × 0.7 × 0.1	150	85	24.0	T10@113	0.92	10
	S-H	0.7 × 0.7 × 0.1	150	85	24.0	T10@113	0.92	15
M.A.L.Silva, et al. [28]	S	1.2 × 1.2 × 0.1	100	0.92	28.0	T10@193	0.54	0
	O	0.7 × 0.7 × 0.1	100	0.92	28.0	T10@193	0.54	0

Figure 1. Load–deflection curves between test and FE models, a) Ahmed et al.[1], and b) M.A.L.Silva, et al. [28].

Table 2. Finite element modeling accuracy.

Ref	specimen ID	Ultimate load, Vu (kN)			Central deflection at Vu (mm)
		Exp	FE	accuracy	Exp	FE	accuracy
Ahmed et al.[1]	S-N	217.00	217.52	-0.24	1.55	1.56	-0.41
	S-L	195.00	205.01	-5.13	2.02	2.02	-0.11
	S-M	171.00	180.04	-5.29	2.81	2.92	-3.85
	S-H	145.00	138.62	4.40	3.12	3.04	2.57
M.A.L.Silva, et al. [28]	S	132.16	129.57	1.96	11.93	12.85	-7.78
	O	130.31	136.62	-4.84	11.69	11.04	5.58

Figure 2. Frequency distribution of input variables.

Table 3. Variables statistical description.

Variable	Min	Max	Average	Std. Dev
Effective slab depth d (mm)	55.0	130.0	83.1	19.3
Compressive strength of concrete $\mathit{f}{c}^{\prime }$ (MPa)	18.2	46.0	27.7	5.6
Span-to-depth ratio L/d	5.0	17.0	11.7	2.9
Reinforcement ratio ρ (%)	0.6	1.6	1.1	0.3
Column dimension b (mm)	100.0	200.0	135.3	33.2
Yield strength of reinforcement fy (Mpa)	356.0	500.0	460.6	47.2
Corrosion ratio CR (%)	0.0	30.0	14.1	7.7
FRP tensile strength fyf (MPa)	0.0	3800.0	1706.0	1359.7
FRP modules of elasticity Ef (GPa)	0.0	240.0	128.6	94.6
FRP Reinforcement ratio ρf (%)	0.0	2.3	0.3	0.6
Punching shear capacity Vu (kN)	18.0	487.3	162.5	118.8

Figure 3. Correlation plot of the dataset between each input variable and the PS capacity.

Figure 4. ANN model composed of eight neurons in one hidden layer.

Figure 5. Performance of the ANN model.

Figure 6. Regression analysis for training, validation, testing, and all data of ANN model.

Figure 7. Comparison between all models.

Figure 8. Graphical user interface (GUI) for the proposed ANN model.

Qian K, Li JS, Huang T, et al. Punching shear strength of corroded reinforced concrete slab-column connections. J Build Eng. 2022;45(August 2021):103489. doi: 10.1016/j.jobe.2021.103489

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Silva MAL, Gamage JCPH, Fawzia S. Performance of slab-column connections of flat slabs strengthened with carbon fiber reinforced polymers. Case Stud Constr Mater. 2019;11:e00275. doi:10.1016/j.cscm.2019.e00275

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Gomaa AM, Lotfy EM, Khafaga SA, et al. Experimental, numerical, and theoretical study of punching shear capacity of corroded reinforced concrete slab-column joints. Eng Struct. 2023;289(May):116280. doi: 10.1016/j.engstruct.2023.116280

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