3D fracture modelling and limit state analysis of prestressed composite concrete pipes

doi:10.1007/s11709-018-0484-4

Front. Struct. Civ. Eng.

2019, Vol. 13

Issue (1) : 165-175 https://doi.org/10.1007/s11709-018-0484-4

RESEARCH ARTICLE

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE¹, Yang SHEN¹(

), Yun GU², Pangyong SHEN²

¹. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
². Shanghai SMI Engineering Project Management Co., Ltd., Shanghai 201103, China

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Abstract

In this manuscript, we study fracture of prestressed cylindrical concrete pipes. Such concrete pipes play a major role in tunneling and underground engineering. The structure is modelled fully in 3D using three-dimensional continuum elements for the concrete structure which beam elements are employed to model the reinforcement. This allows the method to capture important phenomena compared to a pure shell model of concrete. A continuous approach to fracture is chosen when concrete is subjected to compressive loading while a combined continuous-discrete fracture method is employed in tension. The model is validated through comparisons with experimental data.

Keywords cylindrical concrete structures limit state analysis 3D fracture modelling prestressed composite pipes reinforced concrete three-point bending test

Corresponding Author(s): Yang SHEN

Online First Date: 25 July 2018 Issue Date: 04 January 2019

Cite this article:

Pengfei HE,Yang SHEN,Yun GU, et al. 3D fracture modelling and limit state analysis of prestressed composite concrete pipes[J]. Front. Struct. Civ. Eng., 2019, 13(1): 165-175.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-018-0484-4
https://academic.hep.com.cn/fsce/EN/Y2019/V13/I1/165

Fig.1 Cross section of the composite pipes with three layers of concrete and two layers of steel

Fig.2 3D solid element mesh for concrete, shell element for steel cylinder and truss element for steel wires. (a) Mesh for different layers of concrete; (b) mesh of the steel cylinder; (c) prestressed steel wire; (d) circumferential wire

Fig.3 The strain of the pipe with (right) and without (left) using the deformation compatible air element

Fig.4 Boundary conditions for the three point bending test (a) and the position of strain gauges installed on the pipe (b)

Tab.1 Materials parameters

Fig.5 Circumferential strain of interior concrete layers with respect to the load

Fig.6 Circumferential strain of exterior concrete layer with respect to the load

Fig.7 Contour plot of the tendon stress (Pa)

Fig.8 Contour plot of the concrete stress (Pa)

Fig.9 Crack pattern at the spigot of the pipe from the experiment (left) and simulation (right)

Fig.10 Crack pattern at the ceiling of the pipe from the experiment (left) and simulation (right)

Fig.11 Crack pattern at the side of the pipe from the experiment (left) and simulation (right)

Fig.12 Debonding of the exterior concrete and intermediate concrete near the steel wire layer

Fig.13 Contour plot of the normal stress at the interface between the the exterior concrete and intermediate concrete

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