Secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams

doi:10.1007/s11709-022-0809-1

Frontiers of Structural and Civil Engineering

2022, Vol. 16

Issue (3): 388-400 https://doi.org/10.1007/s11709-022-0809-1

本期目录

Secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams

Lizhao DAI¹, Wengang XU¹, Lei WANG¹(

), Shanchang YI¹, Wen CHEN²

¹. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
². Laboratory of Microstructures and Material Mechanics, University of Lorraine, Metz 57045, France

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Abstract：

An experimental study is performed on five post-tensioned concrete beams to explore the effects of different fracture positions on secondary transfer length and residual prestress of fractured strand. A numerical model is developed and used to predict the secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams. The model change interaction, which can deactivate and reactivate the elements for simulating the removal and reproduction of parts of the model, is used to reproduce the secondary anchorage of fractured strand. The numerical model is verified by experimental results. Results shows that the fractured strand can be re-anchored in concrete through the secondary anchorage, and the secondary transfer length of fractured strand with the diameter of 15.2 mm is 1133 mm. The residual prestress of fractured strand increases gradually in the secondary transfer length, and tends to be a constant beyond it. When the fractured strand is fully anchored in concrete, a minor prestress loss will appear, and the average prestress loss is 2.28% in the present study.

Key words： post-tensioned concrete beams strand fracture secondary transfer length residual prestress

收稿日期: 2021-10-09 出版日期: 2022-05-31

Corresponding Author(s): Lei WANG

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2022, 16(3): 388-400.
Lizhao DAI, Wengang XU, Lei WANG, Shanchang YI, Wen CHEN. Secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams. Front. Struct. Civ. Eng., 2022, 16(3): 388-400.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-022-0809-1
https://academic.hep.com.cn/fsce/CN/Y2022/V16/I3/388

Fig.1

Tab.1

Fig.2

Fig.3

Fig.4

type	D0	D1	D2 (left)	D2 (right)	D3 (left)	D3 (right)	D4 (left)	D4 (right)
initial prestress (MPa)	1124	1119	1090	1090	1084	1084	1089	1089
effective prestress before strand fracture (MPa)	1115	1109	1079	1079	1069	1069	1077	1077
prestress loss $ρ 1$ (%)	0.80	0.96	0.98	0.98	1.32	1.32	1.12	1.12
residual prestress after strand fracture (MPa)	–	1087	1009	1039	1046	1049	1061	1051
prestress loss $ρ 2$ (%)	–	1.94	6.55	3.77	2.17	1.87	1.53	2.39

Tab.2

Fig.5

Tab.3

Fig.6

type	concrete	grout	strand	tensile bar	compressive bar	stirrup
Young’s modulus E (GPa)	33.5	32.4	195	200	200	210
Poisson ratio $ν$	0.2	0.2	0.3	0.3	0.3	0.3
tensile strength $f t$ (MPa)	2.51	2.38	–	–	–	–
compressive strength $f c$ (MPa)	46.6	40.3	–	–	–	–
dilation angle $ψ °$	30	30	–	–	–	–
eccentricity $η$	0.1	0.1	–	–	–	–

Tab.4

Fig.7

Fig.8

Fig.9

Tab.5

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