Asymmetric serviceability limit states of symmetrically loaded segmental tunnel rings: Hybrid analysis of real-scale tests

Jiang, Zijie; Liu, Xian; Schlappal, Thomas; Zhang, Jiaolong; Mang, Herbert A.; Pichler, Bernhard

doi:10.1016/j.tust.2021.103832

Cited by 7 publications

(14 citation statements)

References 22 publications

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“…In the design of future tunnels, the convergence-related SLSs in soft clay were defined as 0.3-0.5% of the outer diameter of the circular tunnel lining, D o , in several design codes [6][7][8][9] and in the literature [10,11]. As shown in Table 1, four convergence-related serviceability classes were defined for the operation of the existing shield tunnel linings [12,13], in which C denotes the maximum of the absolute values of the horizontal and vertical convergences, i.e., C h and C v :…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. Classification of convergence-related serviceability of circular shield tunnels according to [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Another hybrid model was established with which the internal forces of the tunnel lining were obtained by employing the in situ-monitored convergences as the input data of a numerical model [33]. The structural deformation state of a symmetrically assembled segmental ring, subjected to symmetric external loading, can be categorized as a symmetric or an asymmetric problem [13]. The hybrid method, first proposed in [34,35] and further generalized in [13], is an effective and reliable mode for the analysis of the structural behavior of segmental tunnel linings.…”

Section: Introductionmentioning

confidence: 99%

“…The structural deformation state of a symmetrically assembled segmental ring, subjected to symmetric external loading, can be categorized as a symmetric or an asymmetric problem [13]. The hybrid method, first proposed in [34,35] and further generalized in [13], is an effective and reliable mode for the analysis of the structural behavior of segmental tunnel linings. It is based on transfer relations which are analytical solutions of the linear theory of circular arches [34].…”

Section: Introductionmentioning

confidence: 99%

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Convergence-Related Serviceability Limit States of Segmental Tunnel Rings: Lessons Learned from Structural Analysis of Real-Scale Tests

Jiang,

Liu,

Mang

et al. 2024

Applied Sciences

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An extended hybrid method for the analysis of the symmetric structural behavior of segmental tunnel linings is proposed. Their deformations cannot be determined by the traditional hybrid methods when the convergences are close to the serviceability limit states (SLSs). Two real-scale tests are employed for the validation of the proposed method. It involves structural analysis that is based on transfer relations. They represent analytical solutions of the linear theory of thin circular arches, and they contain the symmetric mode of rigid-body displacements. The method is termed hybrid because it is based on two types of input, namely the external loading and experimental data of displacements monitored during the test. It is termed extended because, additionally, the vertical and horizontal convergences are employed to produce more accurate structural deformations than obtained by the traditional hybrid method. The latter is found to be unsuitable for structural analysis after sudden failure has occurred in the vicinity of segmental interfaces. At the respective load steps, the structures were in convergence-related serviceability class C, referring to endangered serviceability. The local failures occurring at these load steps resulted in a rapid increase in the structural deformations and fast attainment of the SLS. If, in convergence-related serviceability class C, local failures at segmental interfaces are detected, the strengthening of the structure is necessary. This cannot be delayed to the attainment of serviceability class D, i.e., to reaching the SLS.

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Section: Introductionmentioning

confidence: 99%

“…Table 1. Classification of convergence-related serviceability of circular shield tunnels according to [12,13].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Convergence-Related Serviceability Limit States of Segmental Tunnel Rings: Lessons Learned from Structural Analysis of Real-Scale Tests

Jiang,

Liu,

Mang

et al. 2024

Applied Sciences

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“…Lackner et al [ 10 ] extended the hybrid method (proposed by Hellmich et al [ 7 ]) to the analysis of segmented shotcrete tunnel linings, in which the displacement field is assumed to be smooth within each segment but not the whole lining. Zhang et al [ 11 , 12 ] and Jiang et al [ 13 ] proposed a hybrid method to analyze the segmental tunnel linings, where the dislocation of longitudinal was regarded as one of the input parameters, avoiding the complex work to simulate the joint behavior. These two hybrid methods required the use of numerous embedded displacement sensors on the joints of the lining from the very beginning of tunnel construction, which is not economical.…”

Section: Introductionmentioning

confidence: 99%

Identification Method for Internal Forces of Segmental Tunnel Linings via the Combination of Laser Scanning and Hybrid Structural Analysis

Zhang

Karlovšek

Liu

2022

Sensors

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This paper provides a new solution to identify the internal forces of segmental tunnel linings by combining laser scanning and hybrid structural analysis. First, a hybrid structural analysis method for quantifying the internal forces based on displacement monitoring is established, which requires comprehensive displacement monitoring with high precision and a complete trace history. Motivated by the development of laser scanning, two remedial solutions are proposed for typically insufficient engineering conditions, i.e., lack of displacement developing process and poor accuracy of measurements, which is highlighted in this paper. Therefore, with the help of remedial solutions, the structural analysis is able to be adopted with the application of laser scanning. The tool for developing remedial solutions is the first-order theory of slender circular arches. Virtual tests, based on a calibrated finite element model, were performed to verify the feasibility of the presented hybrid analysis and remedial solutions. In addition, parametric analyses were conducted to study the error propagation from laser scanning to the results of hybrid analysis. The resolution and measurement noise of laser scanning were investigated and discussed. On this basis, advice on combining laser scanning and hybrid structural analysis is proposed. Finally, on-site application of the hybrid analysis on an actual tunnel is presented and discussed.

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On the added value of multi-scale modeling of concrete

Zhang

Binder

Wang

et al. 2022

Front. Struct. Civ. Eng.

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This review of the added value of multi-scale modeling of concrete is based on three representative examples. The first one is concerned with the analysis of experimental data, taken from four high-dynamic tests. The structural nature of the high-dynamic strength increase can be explained by using a multi-scale model. It accounts for the microstructure of the specimens. The second example refers to multi-scale thermoelastic analysis of concrete pavements, subjected to solar heating. A sensitivity analysis with respect to the internal relative humidity (RH) of concrete has underlined the great importance of the RH for an assessment of the risk of microcracking of concrete. The third example deals with multi-scale structural analysis of a real-scale test of a segmental tunnel ring. It has turned out that multi-scale modeling of concrete enables more reliable predictions of crack opening displacements in tunnel segments than macroscopic models taken from codes of practice. Overall, it is concluded that multi-scale models have indeed a significant added value. However, its degree varies with these examples. In any case, it can be assessed by means of a comparison of the results from three sources, namely, multi-scale structural analysis, conventional structural analysis, and experiments.

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Asymmetric serviceability limit states of symmetrically loaded segmental tunnel rings: Hybrid analysis of real-scale tests

Cited by 7 publications

References 22 publications

Convergence-Related Serviceability Limit States of Segmental Tunnel Rings: Lessons Learned from Structural Analysis of Real-Scale Tests

Convergence-Related Serviceability Limit States of Segmental Tunnel Rings: Lessons Learned from Structural Analysis of Real-Scale Tests

Identification Method for Internal Forces of Segmental Tunnel Linings via the Combination of Laser Scanning and Hybrid Structural Analysis

On the added value of multi-scale modeling of concrete

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