Steel failure mode of composite dowel shear connector with rectangular regular cutoff

Silveira, Eliane Gomes da; Caldas, Rodrigo Barreto; Santos, Lucas Ribeiro dos

doi:10.1590/S1983-41952024000300010

Eliane Gomes da Silveira

writing original draft

investigation

visualization

validation

formal analysis

Instituto Federal de Educação, Ciência e Tecnologia do Sul de Minas Gerais - IFSULDEMINAS, Departamento de Engenharia Civil, Pouso Alegre, MG, Brasil

https://orcid.org/0000-0001-7304-5953

Rodrigo Barreto Caldas

supervision

project administration

funding acquisition

writing review and editing

Universidade Federal de Minas Gerais - UFMG, Departamento de Estruturas, Belo Horizonte, MG, Brasil

https://orcid.org/0000-0002-0851-7632

Lucas Ribeiro dos Santos

writing review and editing

Universidade Federal de Minas Gerais - UFMG, Departamento de Estruturas, Belo Horizonte, MG, Brasil

https://orcid.org/0000-0002-3149-490X

Corresponding author: Eliane Gomes da Silveira. E-mail: eliane.silveira@ifsuldeminas.edu.br

Conflict of interest: Nothing to declare.

Editors: Leandro Trautwein, Guilherme Aris Parsekian.

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Fig. 1
- Variables for calculating the critical height according to Feldman et al. [³¹31 M. Feldmann, M. Kopp, and D. Park, “Composite dowels as shear connectors for composite beams - background to the german technical approval,” Steel Constr., vol. 9, no. 2, pp. 80-88, 2016.]

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Fig. 2
- Composite dowel shear connector with regular rectangular cutoff. Measures in millimeters.

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Fig. 3
- Connector steel failure strength curve, according to von Mises criterion, varying as a function of the section height considered in the steel dowel.

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Fig. 4
- Shape coefficient determination for shear connector with regular rectangular cutoff (R serie).

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Fig. 5
- Results of the parametric study compared to obtained with .

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Fig. 6
- Connector steel failure strength as a function of b_ret/h_D ratio, steel yield strength (f_y) and plate thickness (t_w).

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Fig. 7
- Connector steel failure strength as a function of b_ret/h_D ratio with f_y = 350 MPa, plate thickness of 12,5 mm, results according to .

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Fig. 8
- Connector steel failure strength according to von Mises criterion, comparing plate thickness and steel yield strength.

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Fig. 9
- Connector shape coefficient as a function of e_x/h_D ratio.

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Fig. 2
- Composite dowel shear connector with regular rectangular cutoff. Measures in millimeters.

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Fig. 3
- Connector steel failure strength curve, according to von Mises criterion, varying as a function of the section height considered in the steel dowel.

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Fig. 4
- Shape coefficient determination for shear connector with regular rectangular cutoff (R serie).

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Fig. 5
- Results of the parametric study compared to obtained with .

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Fig. 6
- Connector steel failure strength as a function of b_ret/h_D ratio, steel yield strength (f_y) and plate thickness (t_w).

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Fig. 7
- Connector steel failure strength as a function of b_ret/h_D ratio with f_y = 350 MPa, plate thickness of 12,5 mm, results according to .

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Fig. 8
- Connector steel failure strength according to von Mises criterion, comparing plate thickness and steel yield strength.

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Fig. 9
- Connector shape coefficient as a function of e_x/h_D ratio.

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Fig. 10
- Steel dowel identification depending on the load application during the test. Detail of the sequence of nodes in the third dowel.

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Fig. 11
- Sequence of numerical results for X model, according to Caldas et al. [²⁹29 B. Caldas, R. H. Fakury, G. S. Veríssimo, F. C. Rodrigues, and H. C. Cardoso, “Análise experimental de transferência de esforços entre os componentes de aço e concreto de pilares mistos tubulares preenchidos utilizando conectores formados por chapas com dentes retangulares”, Relatório final de pesquisa, Edital FAPEMIG 01/2015, Demanda Universal APQ-01117-15, Belo Horizonte, 2019.]. Von Mises stresses, CPRESS and CSHEAR for: Increment 23 (a), Increment 28 (b), Increment 37 (c), Increment 234 (d) and Increment 364 (e).

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Fig. 12
- Force versus slip curve with experimental and numerical results of the X model, with the corresponding increments represented.

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Fig. 13
- Connector behavior mechanical model from numerical analysis.

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Fig. 14
- Normal pressure distribution on the connector (a, d, g), friction distribution in the connector (b, e, h) and resulting force on the connector side (c, f, i).

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Tab. 1
- Shape coefficient calculated according to experimental data from Caldas et al. [²⁹29 B. Caldas, R. H. Fakury, G. S. Veríssimo, F. C. Rodrigues, and H. C. Cardoso, “Análise experimental de transferência de esforços entre os componentes de aço e concreto de pilares mistos tubulares preenchidos utilizando conectores formados por chapas com dentes retangulares”, Relatório final de pesquisa, Edital FAPEMIG 01/2015, Demanda Universal APQ-01117-15, Belo Horizonte, 2019.].

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Tab. 2
- Shape coefficient obtained from numerical modeling of experimental results.

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Tab. 3
- Numerical models main variables of the parametric study.

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Tab. 4
- Numerical results of the parametric study and corresponding shape coefficients.

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Tab. 5
- Connector series with geometry variation in steel dowel ratio b_ret/h_D for parametric study.

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Tab. 6
- Average shape coefficient calculated as a function of b_ret/h_D ratio according to analytical study.

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(2)

(3)

(4)

(5)

(6)

(7)

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(12)

Specimen	P_u,Exp (kN)	q_cn,Exp (kN)	P_max,1 (kN)	P_Rk (kN)	P_Rd (kN)^* * steel of the connector USI CIVIL 350 and γv = 1.25.	A_ULT,test
D1	1504.31	752.15	250.72	225.65	180.00	0.429
D2	1516.83	758.42	252.81
E1	-	-	-	303.00	241.71	0.576
E2	2020.02	1010.01	336.67
R1	2268.69	1134.35	378.12	337.15	268.95	0.640
R2	2247.67	1123.83	374.61
X1	1263.84	631.92	210.64	168.56	134.46	0.320
X2	1123.73	561.87	187.29
Y1	1275.98	637.99	212.66	191.39	152.68	0.363
Y2	1276.71	638.35	212.79

Series	P_num (kN)	q_num (kN)	P_max,1 (kN)	A_ULT,num	P_num/P_u,Exp	A_ULT,num/A_ULT,test
D*	1081.16	540.58	180.19	0.308	0.72	0.72
E*	1209.18	604.59	201.53	0.344	0.60	0.60
R*	1157.34	578.67	192.89	0.330	0.51	0.51
X*	1018.66	509.33	169.78	0.290	0.91	0.91
Y*	985.8	492.90	164.30	0.281	0.77	0.77

Model	B (mm)	t (mm)	b_ret (mm)	h_D (mm)	t_w (mm)	e_x (mm)	c_bc (mm)	n	n_c	f_y (MPa)	f_c (MPa)	f_yt (MPa)
A	250	4.00	60	70	12.5	120	20	3	2	350	40	350
B	250	1.50	60	70	12.5	120	20	3	2	350	40	350
C	250	8.00	60	70	12.5	120	20	3	2	350	40	350
D	250	4.00	60	70	8.0	120	20	3	2	350	40	350
E	250	4.00	60	70	16.0	120	20	3	2	350	40	350
F	250	4.00	60	70	12.5	120	20	3	2	350	40	250
G	250	4.00	60	70	12.5	120	20	3	2	350	40	450
H	250	4.00	60	70	12.5	120	20	3	2	250	40	350
I	250	4.00	60	70	12.5	120	20	3	2	450	40	350
J	250	4.00	60	70	12.5	120	20	3	2	350	30	350
K	250	4.00	60	70	12.5	120	20	3	2	350	50	350
L	250	4.00	60	70	12.5	120	20	2	2	350	40	350
M	250	4.00	60	70	12.5	120	20	1	2	350	40	350
N	250	4.00	60	70	12.5	120	20	4	2	350	40	350
O	250	4.00	50	65	12.5	100	20	3	2	350	40	350
P	250	4.00	80	80	12.5	160	20	3	2	350	40	350
Q	250	4.00	60	70	12.5	120	10	3	2	350	40	350
R	250	4.00	60	70	12.5	120	30	3	2	350	40	350

Model	P_num (kN)	q_num (kN)	P_max,1 (kN)	A_ULT,num
A	891.28	445.64	148.55	0.283
B	750.95	375.47	125.16	0.238
C	988.84	494.42	164.81	0.314
D	672.87	336.43	112.14	0.334
E	1002.25	501.12	167.04	0.249
F	879.67	439.83	146.61	0.279
G	895.27	447.64	149.21	0.284
H	735.65	367.82	122.61	0.327
I	973.32	486.66	162.22	0.240
J	793.87	396.93	132.31	0.252
K	949.82	474.91	158.30	0.302
L	625.12	312.56	156.28	0.298
M	231.98	115.99	115.99	0.221
N	1258.30	629.15	157.29	0.300
O	699.08	349.54	116.51	0.266
P	1198.98	599.49	199.83	0.285
Q	813.81	406.90	135.63	0.258
R	961.28	480.64	160.21	0.305

Connector	b_ret (mm)	h_D (mm)	b_ret	e_x (mm)	r_D (mm)	Connector	b_ret (mm)	h_D (mm)	b_ret	e_x (mm)	r_D (mm)
Connector	b_ret (mm)	h_D (mm)	h_D	e_x (mm)	r_D (mm)	Connector	b_ret (mm)	h_D (mm)	h_D	e_x (mm)	r_D (mm)
CR50-170	50	170	0.3	100	12.5	CR80-200	80	200	0.4	160	12.5
CR50-125	50	125	0.4	100	12.5	CR80-160	80	160	0.5	160	12.5
CR50-100	50	100	0.5	100	12.5	CR80-135	80	135	0.6	160	12.5
CR50-85	50	85	0.6	100	12.5	CR80-115	80	115	0.7	160	12.5
CR50-70	50	70	0.7	100	12.5	CR80-100	80	100	0.8	160	12.5
CR50-65	50	65	0.8	100	12.5	CR80-90	80	90	0.9	160	12.5
CR50-55	50	55	0.9	100	12.5	CR80-80	80	80	1	160	12.5
CR50-50	50	50	1	100	12.5
CR60-150	60	150	0.4	120	12.5	CR90-225	90	225	0.4	180	12.5
CR60-120	60	120	0.5	120	12.5	CR90-180	90	180	0.5	180	12.5
CR60-100	60	100	0.6	120	12.5	CR90-150	90	150	0.6	180	12.5
CR60-85	60	85	0.7	120	12.5	CR90-130	90	130	0.7	180	12.5
CR60-75	60	75	0.8	120	12.5	CR90-115	90	115	0.8	180	12.5
CR60-70	60	70	0.9	120	12.5	CR90-100	90	100	0.9	180	12.5
CR60-60	60	60	1	120	12.5	CR90-90	90	90	1	180	12.5
CR70-175	70	175	0.4	140	12.5	CR100-250	100	250	0.4	200	12.5
CR70-140	70	140	0.5	140	12.5	CR100-200	100	200	0.5	200	12.5
CR70-120	70	120	0.6	140	12.5	CR100-170	100	170	0.6	200	12.5
CR70-100	70	100	0.7	140	12.5	CR100-145	100	145	0.7	200	12.5
CR70-90	70	90	0.8	140	12.5	CR100-125	100	125	0.8	200	12.5
CR70-80	70	80	0.9	140	12.5	CR100-115	100	115	0.9	200	12.5
CR70-70	70	70	1	140	12.5	CR100-100	100	100	1	200	12.5

b_ret/h_D	A_ULT
0.4	0.115
0.5	0.145
0.6	0.171
0.7	0.200
0.8	0.221
0.9	0.242
1.0	0.263

P_{p l} = (1 + \frac{h_{c r i t}}{h_{e f f} - h_{c r i t}}) (\frac{b_{c r i t}}{\sqrt{16 h_{s, c r i t}^{2} + 3 b_{c r i t}^{2}}}) b_{c r i t} t_{w} f_{y}

b = 2 (r_{D} - r_{D} s i n α) + b_{r e t} \Rightarrow b = 2 r_{D} (1 - s i n α) + b_{r e t} \Rightarrow b = 2 r_{D} [1 - s i n (a rccos (\frac{r_{D} - h}{r_{D}}))] + b_{r e t}

\{\begin{matrix} h < r_{D} \to b = 2 r_{D} [1 - s i n (a rccos (\frac{r_{D} - h}{r_{D}}))] \\ h \geq r_{D} \to b = b_{r e t} \end{matrix} + b_{r e t};

\begin{matrix} 2 h_{s} \cdot \frac{P_{p l}}{h_{e f f}} = (\frac{b}{\sqrt{16 h_{s}^{2} + 3 b^{2}}}) f_{y} t_{w} b \Rightarrow P_{p l} = (\frac{h_{e f f}}{2 h_{s}}) (\frac{b}{\sqrt{16 h_{s}^{2} + 3 b^{2}}}) f_{y} t_{w} b \Rightarrow \\ \Rightarrow P_{p l} = (\frac{h_{e f f}}{h_{e f f} - h}) (\frac{b}{\sqrt{16 h_{s}^{2} + 3 b^{2}}}) f_{y} t_{w} b \Rightarrow P_{p l} = [\frac{(h_{e f f} - h) + h}{h_{e f f} - h}] (\frac{b}{\sqrt{16 h_{s}^{2} + 3 b^{2}}}) f_{y} t_{w} b \Rightarrow \\ \Rightarrow P_{p l} = (1 + \frac{h}{h_{e f f} - h}) (\frac{b}{\sqrt{16 h_{s}^{2} + 3 b^{2}}}) f_{y} t_{w} b \end{matrix}

[1] Corresponding author: Eliane Gomes da Silveira. E-mail: eliane.silveira@ifsuldeminas.edu.br

Brasil

Brasil

Steel failure mode of composite dowel shear connector with rectangular regular cutoff

Modo de falha do aço do conector de cisalhamento com corte regular retangular

Abstract