Experimental and analytical study on longitudinal joint opening of concrete segmental lining

Yan, Zhiguo; Zhen, Wang; Zhu, Hehua

doi:10.1016/j.tust.2014.11.002

Cited by 100 publications

(66 citation statements)

References 12 publications

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“…The interaction with the ground mass and the resulting behavior of the joints between neighboring segments govern the structural behavior of the lining. The mechanical behavior of the joints depends on their design, including the geometric layout of the initial segment‐to‐segment contact area and the use of bolts, connecting neighboring segments, either non‐prestressed or prestressed . The behavior of the joints is nontrivial, because of (1) nonlinearities resulting from bending‐induced partial segment‐from‐segment separation, (2) nonlinearities resulting from the material behavior, including crushing of concrete and yielding of the steel bolts, and (3) the time‐dependent viscoelastic material behavior of concrete .…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical behavior of the joints depends on their design, including the geometric layout of the initial segment‐to‐segment contact area and the use of bolts, connecting neighboring segments, either non‐prestressed or prestressed . The behavior of the joints is nontrivial, because of (1) nonlinearities resulting from bending‐induced partial segment‐from‐segment separation, (2) nonlinearities resulting from the material behavior, including crushing of concrete and yielding of the steel bolts, and (3) the time‐dependent viscoelastic material behavior of concrete . The aim of the present paper is to consider all of these influence factors in the framework of analyzing a bearing‐capacity test of a segmental tunnel ring, without the need to explicitly model the nontrivial joint behavior.…”

Section: Introductionmentioning

confidence: 99%

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On a nonlinear hybrid method for multiscale analysis of a bearing‐capacity test of a real‐scale segmental tunnel ring

Zhang

Mang

Liu

et al. 2019

Num Anal Meth Geomechanics

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Summary A nonlinear hybrid method is developed for multiscale analysis of a bearing‐capacity test of a real‐scale segmental tunnel ring subjected to point loads. The structural analysis consists of two parts. Part I refers to modeling of bending‐induced tensile cracking of the segments, resulting from the external loading. The segments are subdivided into elements, according to the crack spacing. Each element is either intact or contains one central crack band, flanked by lateral undamaged domains. A multiscale model for tensile softening of concrete is used to describe the progressive deterioration of the crack bands. After iterative determination of their state of damage, the effective bending and extensional stiffnesses of the corresponding elements are quantified by means of Voigt‐Reuss‐Hill estimates. The effective stiffnesses are used for linear‐elastic simulations of the segmental tunnel ring. Part II refers to the relative rotation angles at the joints, which are estimated from monitoring data, using the Bernoulli‐Euler hypothesis. Since the validity of this hypothesis is questionable for neck‐like joints, the relative rotation angles are post‐processed such that they refer to rigid body displacements of the segments. The following conclusions are drawn: The presented approach yields good estimates of crack widths. Relative rotation angles at the joints mainly result in rigid body displacements of the segments, governing the convergences. Because realistic interface models are lacking, hybrid analysis based on displacement‐monitoring data allows for performing ultimate‐load analysis of segmental tunnel rings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On a nonlinear hybrid method for multiscale analysis of a bearing‐capacity test of a real‐scale segmental tunnel ring

Zhang

Mang

Liu

et al. 2019

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

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“…Thus, the duration of fire exposure had little effect on specimens' deformation behavior (at least up to 120 min). Joint opening is an important indicator of deformation in a shield tunnel and it is often investigated to assess a tunnel's safety [28]. Figure 16 presents the joint opening increment versus vertical loading data for all of the specimens.…”

Section: Load Test Results and Discussionmentioning

confidence: 99%

Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

Luo

Zang

2019

Applied Sciences

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Owing to its discontinuous configuration, segment joint is of particular concern when the shield tunnel lining is exposed to fire. The thermal behavior of such joints when exposed to fire was investigated experimentally in full scale. In addition, the effectiveness of using concrete-filled steel tubes (CFSTs) to restore joint strength after a fire was also investigated. Five full-scale reinforced concrete segment joints were fabricated. Four were exposed to the ISO 834 standard fire for 60 or 120 min, with the fifth serving as a control. Two fire-damaged specimens were then strengthened with CFSTs. All five specimens were then loaded to failure at room temperature. It was found that: (1) The effect of the joint gap on the temperature distribution was observed to change markedly during heating; (2) the temperature of the bolt end was much higher than that of the bolt mid-point, insulating the bolt ends is probably called for; (3) the bearing capacity and flexural stiffness of the fire-damaged segment joints can be significantly improved by strengthening with CFSTs.

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“…Engineering practice and theoretical studies show that the section of a segment joint is used to maintain the balance of internal force and transfer forces, which is similar to the force-transferring property of reinforced concrete cross section [1].…”

Section: Establishment and Basic Idea Of Heb Modelmentioning

confidence: 94%

“…Shield technique has been widely applied in the construction of urban subway and underwater tunnels owing to its high level of mechanization, rapid construction, and minimal environmental impact [1,2]. e design of the segment structure is of critical importance for the application of shield technique and project construction, in terms of both the safety of tunnel structure and construction cost.…”

Section: Introductionmentioning

confidence: 99%

A Structural Calculation Model of Shield Tunnel Segment: Heterogeneous Equivalent Beam Model

Lei

Lin

Shi

et al. 2018

Advances in Civil Engineering

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A heterogeneous equivalent beam model (HEB model) of the shield tunnel segment structure is proposed based on a systematical analysis on the stress state of the cross section of segment joints. This model treats a noncontinuous segment structure as a continuous heterogeneous structure, on the basis of the principle of equivalent stress state on a section and equivalent conversion of the mechanical parameters. For a comprehensive demonstration of the proposed HEB model, an interpretative solution of equivalent mechanical parameters of the joint section is obtained through theoretical derivation, and a specific iterative computation flow is provided in accordance. Model validation and comparative analysis are also conducted for two industrial applications. It is found that the iterative process of calculation has good convergence, leading to reliable numerical results for all cases under consideration. Resulting simulations reveal that the proposed HEB model can reflect the effect of joints on overall rigidity of a segment structure. Compared with the computation results obtained using other models presented in the literature, there are smaller axial force deviation and larger bending moment deviation (up to 20% or higher), demonstrating that the model selection is important in design and computation of a segment structure of shield tunnels. The proposed model and analysis for model performance may provide useful reference for engineers in shield tunnel community.

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Experimental and analytical study on longitudinal joint opening of concrete segmental lining

Cited by 100 publications

References 12 publications

On a nonlinear hybrid method for multiscale analysis of a bearing‐capacity test of a real‐scale segmental tunnel ring

On a nonlinear hybrid method for multiscale analysis of a bearing‐capacity test of a real‐scale segmental tunnel ring

Thermal Behavior of Tunnel Segment Joints Exposed to Fire and Strengthening of Fire-damaged Joints with Concrete-filled Steel Tubes

A Structural Calculation Model of Shield Tunnel Segment: Heterogeneous Equivalent Beam Model

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