Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete railway sleepers

doi:10.1007/s11709-023-0928-3

Frontiers of Structural and Civil Engineering

2023, Vol. 17

Issue (3): 411-428 https://doi.org/10.1007/s11709-023-0928-3

本期目录

Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete railway sleepers

Sayed AHMED¹, Hossam ATEF²(

), Mohamed HUSAIN¹

¹. Department of Structural Engineering, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt
². Track Work Department, National Authority for Tunnels, Cairo 11522, Egypt

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Abstract：

In this study, ultrahigh-performance fiber-reinforced concrete (UHPFRC) used in a type B70 concrete sleeper is investigated experimentally and parametrically. The main parameters investigated are the steel fiber volume fractions (0%, 0.5%, 1%, and 1.5%). Under European standards, 35 UHPFRC sleepers are subjected to static bending tests at the center and rail seat sections, and the screw on the fastening system is pulled out. The first cracking load, failure load, failure mode, crack propagation, load–deflection curve, load–crack width, and failure load from these tests are measured and compared with those of a control sleeper manufactured using normal concrete C50. The accuracy of the parametric study is verified experimentally. Subsequently, the results of the study are applied to UHPFRC sleepers with different concrete volumes to investigate the effects of the properties of UHPFRC on their performance. Experimental and parametric study results show that the behavior of UHPFRC sleepers improves significantly when the amount of steel fiber in the mix is increased. Sleepers manufactured using UHPFRC with a steel fiber volume fraction of 1% and a concrete volume less than 25% that of standard sleeper B70 can be used under the same loads and requirements, which contributes positively to the cost and surrounding environment.

Key words： pre-stressed concrete sleeper ultrahigh performance fiber-reinforced concrete pull-out test static bending test steel fiber aspect ratio volume fraction

收稿日期: 2022-08-22 出版日期: 2023-05-24

Corresponding Author(s): Hossam ATEF

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(3): 411-428.
Sayed AHMED, Hossam ATEF, Mohamed HUSAIN. Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete railway sleepers. Front. Struct. Civ. Eng., 2023, 17(3): 411-428.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-023-0928-3
https://academic.hep.com.cn/fsce/CN/Y2023/V17/I3/411

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Fig.19

index	steps of calculation
compression block area	$A c = b c a$ , $a = a 1 c$ , $a 1 = 0.8, 0.65$
pre-stressing wire	$E p = 205 G P a$ , $A p = 69.4 m m 2$
	$f p y = 1460 M P a$ , $f p u = 1620 M P a$ , $? p e = f p e / E p = 0.006193$
	$f p e = f p y / ? p s = 1270 M P a$ , $? p s = 1.15$
steel fiber	$E s = 200 G P a$ , $? = 50 m m$ , $d f = 1 m m$ , $v f = 0, 0.5 %, 1 %, 1.5 %$ , $F b e = 1.2$
c	assumed for (C = $∑ T n$ )
e	$e = [? s + 0.003] c / 0.003$
tensile block area	$A t = b t (h ? e)$
compressive forces	$C = 0.85 f c u A c$
the nominal moment, $M n$	$∑ T n ? Z n$
the design moment, $M d$	$M d r +$ = 13 kN?m , $M d c ?$ = 10 kN?m
the condition	$? M n ? ? M d$

Tab.6

Fig.20

Fig.21

sleeper series	rail seat section					center section
sleeper series	$M n$	$? M n$	$M d r +$	$? M d r +$	safety factor	$M n$	$? M n$	$M d c ?$	$? M d c ?$	safety factor
SN	51.5	43.8	13	24.1	1.82	26.3	22.3	10	18.5	1.21
S0	69.4	59.0	–	–	2.45	36.4	31.0	–	–	1.67
S0.5	73.3	62.3	–	–	2.59	39.1	33.2	–	–	1.79
S1	77.3	65.7	–	–	2.73	41.9	35.6	–	–	1.92
S1.5	80.9	68.8	–	–	2.86	44.4	37.7	–	–	2.04

Tab.7

sleeper series	$A v . F r B (E x p .)$	$F r B (C a l .)$	$F c B (R e f .)$	$F c B (E x p .) / F c B (C a l .)$	$F c B (E x p .) / F c B (R e f .)$
S0	481.5	589.7	325	0.82	1.48
S0.5	553.7	622.7	–	0.89	1.70
S1	604.3	657.0	–	0.92	1.86
S1.5	650.0	687.6	–	0.95	2.00

Tab.8

sleeper series	$A v . F r B (E x p .)$	$F r B (C a l .)$	$F c B (R e f .)$	$F c B (E x p .) / F c B (C a l .)$	$F c B (E x p .) / F c B (R e f .)$
S0	106.7	88.5	75	1.21	1.42
S0.5	118.3	94.9	–	1.25	1.57
S1	122.2	101.7	–	1.20	1.63
S1.5	128.2	107.8	–	1.19	1.71

Tab.9

sleeper series	rail seat section					center section
sleeper series	$M n$	$? M n$	$M d r +$	$? M d r +$	safety factor	$M n$	$? M n$	$M d c ?$	$? M d c ?$	safety factor
S0	50	42.3	13	24.05	1.77	25.0	21.2	10	18.5	1.15
S0.5	46.7	39.7	–	–	1.65	23.4	19.9	–	–	1.07
S1	43	36.6	–	–	1.52	21.9	18.6	–	–	1.01
S1.5	45	38.3	–	–	1.59	23.2	19.7	–	–	1.06

Tab.10

Fig.22

sleeper series	average failure load, $P c r$ (kN)	concrete strength, $f c u$ (MPa)	$P c r / f c u$
S0	107.6	102.05	1.05
S0.5	119.1	112.00	1.06
S1	131.6	122.89	1.07
S1.5	153.4	132.87	1.15

Tab.11

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