Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance fiber-reinforced concrete

doi:10.1007/s11709-023-0977-7

Frontiers of Structural and Civil Engineering

2023, Vol. 17

Issue (6): 870-883 https://doi.org/10.1007/s11709-023-0977-7

本期目录

Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance fiber-reinforced concrete

Hui WANG¹, Yong YUAN², Junnan QIU³, Yuan XUE⁴, Guangzhou XIE¹, Qian CHENG¹, Yuanchao DING¹, Qing AI¹(

)

¹. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
². College of Civil Engineering, Tongji University, Shanghai 200092, China
³. Shanghai Chengtou Highway Group Co., Ltd., Shanghai 200336, China
⁴. Shanghai Shentong Metro Group Co., Ltd., Shanghai 201103, China

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Abstract：

Prefabricated internal structures of road tunnels, consisting of precast elements and the connections between them, provide advantages in terms of quality control and manufacturing costs. However, the limited construction space in tunnels creates challenges for on-site assembly. To identify feasible connecting joints, flexural tests of precast straight beams connected by welding-spliced or lap-spliced reinforcements embedded in normal concrete or ultra-high-performance fiber-reinforced concrete (UHPFRC) are first performed and analyzed. With an improvement in the strength grade of the closure concrete for the lap-spliced joint, the failure of the beam transforms from a brittle splitting mode to a ductile flexural mode. The beam connected by UHPFRC100 with short lap-spliced reinforcements can achieve almost equivalent mechanical performance in terms of the bearing capacity, ductility, and stiffness as the beam connected by normal concrete with welding-spliced reinforcements. This favorable solution is then applied to the connection of neighboring updeck slabs resting on columns in a double-deck tunnel. The applicability is validated by flexural tests of T-shaped joints, which, fail in a ductile fashion dominated by the ultimate bearing capacity of the precast elements, similar to the corresponding straight beam. The utilization of UHPFRC significantly reduces the required lap-splice length of reinforcements owing to its strong bonding strength.

Key words： UHPFRC prefabricated updeck road tunnel lap-spliced rebars flexural tests

收稿日期: 2022-11-04 出版日期: 2023-08-30

Corresponding Author(s): Junnan QIU,Qing AI

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(6): 870-883.
Hui WANG, Yong YUAN, Junnan QIU, Yuan XUE, Guangzhou XIE, Qian CHENG, Yuanchao DING, Qing AI. Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance fiber-reinforced concrete. Front. Struct. Civ. Eng., 2023, 17(6): 870-883.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-023-0977-7
https://academic.hep.com.cn/fsce/CN/Y2023/V17/I6/870

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beam No.	$M y$ ( $k N ? m)$	$M u$ ( $k N ? m$ )	$δ y$ $(× 10 − 3 m)$	$δ y$ $(× 10 − 3 m)$	$μ = δ u / δ y$
W1-C60	1579.6	1845.1	21.7	40.6	1.87
L2-C80	−	902.3	−	12.1	−
L3-UHPFRC80	1658.0	1714.4	23.4	27.4	1.17
L4-UHPFRC100	1620.5	1833.8	20.9	35.5	1.70

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concrete grade	$f c, c u$ (MPa)	n	$ε c 0$ $(‰)$	$ε c u$ ( $‰)$	$E c$ (GPa)	$f c$ (MPa)	$f t$ (MPa)
C50	49.2	2.00	2.00	3.50	35.0	47.2	3.46
C60	55.1	2.00	2.00	3.50	36.3	53.1	3.80
C80	50.7	2.00	2.00	3.50	35.4	48.7	3.55
UHPFRC80	82.8	1.48	2.38	2.74	40.4	75.8	4.54
UHPFRC100	95.9	1.40	2.50	2.60	42.4	88.9	4.86

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