The Numerical Analysis and Field Measurements of the Shield Tunnel Passing through the Pipeline Groups

In this work, research was carried out based on the shield tunnel of metro line 1 in Hangzhou. The construction of this tunnel beneath the sewage pipelines, which have large diameter with water pressure. The project studied in this treatise is relatively rare in China in terms of sewer pipes, the number of sewers, spacing between shield and sewers and the crossing times. A numerical model was established to analyze the construction of metro across the sewage pipelines with water pressure, taking the interactions between tunnel, pipelines and soil into account. The stress of pipelines, settlement of pipelines and ground during the crossing process were calculated. The finite element results were compared with measured results to verify the reliability of numerical results. Some meaningful results were achieved.

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A Numerical Analysis for Cracks Emanating from a Quarter-Spherical Cavity on the Edge of an Elastic Body

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.499.243 ◽

2012 ◽

Vol 499 ◽

pp. 243-247

Author(s):

Long Hai Yan ◽

Bao Liang Liu

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Analysis ◽

Elastic Body ◽

Spherical Cavity ◽

Numerical Results ◽

Shielding Effect ◽

Corner Crack ◽

Element Method

This note is specifically concerned with cracks emanating from a quarter-spherical cavity on the edge in an elastic body (see Fig.1) by using finite element method. The numerical results show that the existence of the cavity has a shielding effect of the corner crack. In addition, it is found that the effect of boundaries parallel to the crack on the SIFs is obvious when.H/R≤3

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Vibro-Acoustic Numerical Simulation for Analyzing Floor Noise of a Multi-Unit Residential Structure

Applied Sciences ◽

10.3390/app9204289 ◽

2019 ◽

Vol 9 (20) ◽

pp. 4289 ◽

Cited By ~ 1

Author(s):

Sangki Park

Keyword(s):

Numerical Simulation ◽

Numerical Analysis ◽

Numerical Model ◽

South Korea ◽

Acoustic Analysis ◽

Measurement Data ◽

Field Measurements ◽

Story Structure ◽

Residential Structures ◽

Good Agreement

In South Korea, the construction of new multi-unit residential structures has been continuously increasing in order to accommodate multiple households in single structures. However, the presence of walls and floors shared with neighbors makes these structures exceptionally vulnerable to floor noise transmission when the noise of everyday life occurs. In particular, South Korea has many social problems associated with such floor noise, which require the utmost attention and immediate resolution. In this study, a 17-story structure was selected as a test structure. Field measurements were carried out. A numerical model for the 17-story structure was developed in order to perform a vibro-acoustic analysis. The validation of the numerical model comparing with the field measurement data results shows a good agreement. Finally, it is concluded that numerical analysis can be applied to resolve floor noise problems arising in multi-unit residential structures.

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Two-Dimensional Finite Element Analysis of Laboratory Seawall Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.2134 ◽

2014 ◽

Vol 580-583 ◽

pp. 2134-2140

Author(s):

Jian Zhang ◽

Jian Feng Zhai ◽

Xian Mei Wang ◽

Jie Chen

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Numerical Analysis ◽

Numerical Results ◽

Experimental Results ◽

Base Layer ◽

Two Dimensional ◽

Element Analysis ◽

Cemented Sand ◽

Dimensional Finite Element

Two-Dimensional finite element analysis was used to investigate the performance of seawall construction over weak subgrade soil using artificial base layer material consisted of cemented sand cushion comprising geosynthetics materials. Two types of base layer materials pure sand and cemented sand comprising husk rich ash and two types of geosynthetics materials geogrid and geotextile were used. Constitutive models were used to represent different materials in numerical analysis. The competence of two-dimensional numerical analysis was compared with experimental results. Numerical results showed a superior harmony with the experimental results. Finite element analysis model proved to be a great tool to determine the parameters that are difficult to measure in laboratory experiments. In addition, finite element analysis has the benefit of cost and time saving when compared to experimental investigation work. Numerical results showed strain induced in geosynthetics eliminated beyond a distance approximately equal six times of footing width.

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Numerical Study of Hydrodynamic Forces on a Submarine Piggyback Pipeline Under Wave Action

Volume 3: Pipeline and Riser Technology ◽

10.1115/omae2012-83214 ◽

2012 ◽

Cited By ~ 1

Author(s):

Xiaofei Cheng ◽

Yongxue Wang ◽

Bing Ren ◽

Guoyu Wang

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Model ◽

Stokes Equations ◽

Numerical Study ◽

Hydrodynamic Forces ◽

Wave Action ◽

Numerical Results ◽

Physical Model Test ◽

Element Method

In the paper, a 2D numerical model is established to simulate the hydrodynamic forces on a submarine piggyback pipeline under regular wave action. The two-dimensional Reynolds-averaged Navier-Stokes equations with a κ-ω turbulence model closure are solved by using a three-step Taylor-Galerkin finite element method (FEM). A Computational Lagrangian-Eulerian Advection Remap Volume of Fluid (CLEAR-VOF) method is employed to simulate free surface problems, which is inherently compatible with unstructured meshes and finite element method. The numerical results of in-line force and lift (transverse) force on the piggyback pipeline for e/D = G/D = 0.25 and KC = 25.1 are compared with physical model test results, which are conducted in a marine environmental flume in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China. It is indicated that the numerical results coincide with the experimental results and that the numerical model can be used to predict the hydrodynamic forces on the piggyback pipeline under wave action. Based on the numerical model, the surface pressure distribution and the motion of vortices around the piggyback pipeline for e/D = G/D = 0.25, KC = 25.1 are investigated, and a characteristic vortex pattern around the piggyback pipeline denoted “anti-phase-synchronized” pattern is recognized.

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Numerical Modelling and Simulation of the In-Plane Response of a Three-Storey Masonry-Infilled RC Frame Retrofitted with TRM

Advances in Civil Engineering ◽

10.1155/2020/6279049 ◽

2020 ◽

Vol 2020 ◽

pp. 1-19

Author(s):

Christiana A. Filippou ◽

Nicholas C. Kyriakides ◽

Christis Z. Chrysostomou

Keyword(s):

Sensitivity Analysis ◽

Finite Element ◽

Numerical Model ◽

Parametric Study ◽

Shear Capacity ◽

Numerical Results ◽

Rc Frame ◽

Masonry Infill ◽

Infilled Frame ◽

Gap Opening

A numerical study was conducted to investigate the in-plane behavior of a masonry-infilled reinforced concrete (RC) frame retrofitted with textile-reinforced mortar (TRM). A two-dimensional finite element model was developed using DIANA finite element analysis (FEA) software to simulate the 2 : 3 scaled three-storey masonry-infilled RC frame retrofitted with TRM that was studied experimentally in the past. The three-storey structure used in the test was with a nonseismic design and detailing, and was subjected to in-plane displacement-control cyclic loading. The current study evaluates the capabilities of a representative numerical model to simulate the results of the experimental test, and after the calibration of the numerical model sensitivity analysis and parametric study were performed. In order to create an accurate numerical model, suitable constitutive models, based on the smeared crack approach, were used to characterize the nonlinear response of concrete, masonry infill, and TRM. The calibration of the models was based on the experimental results or inverse fitting based on optimizing the simulation of the response. The numerical model proved capable of simulating the in-plane behavior of the retrofitted masonry-infilled RC frame with good accuracy in terms of initial stiffness, and its deterioration, shear capacity, and cracking patterns. The calibrated model was then used to perform sensitivity analysis in order to examine the influence of infill-frame interface properties (tangential and normal stiffness) on the behavior of the retrofitted infilled frame. The numerical results showed that the gap opening is influenced significantly by the stiffness of the interface. In addition, a parametric study was performed in order to evaluate the importance of the full-bond condition between the TRM and the masonry-infilled RC frame. The numerical results indicate that the composite action between the TRM and the masonry-infilled RC frame improves the global stiffness and lateral resistance of the infilled frame, and it reduces the gap opening between the masonry infill and the RC frame.

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Numerical analysis and experimental testing of ultra-high performance fibre reinforced concrete keyed dry and epoxy joints in precast segmental bridge girders

International Journal of Advanced Structural Engineering ◽

10.1007/s40091-019-00246-6 ◽

2019 ◽

Vol 11 (4) ◽

pp. 463-472

Author(s):

Balamurugan A. Gopal ◽

Farzad Hejazi ◽

Milad Hafezolghorani ◽

Voo Yen Lei

Keyword(s):

Reinforced Concrete ◽

Numerical Analysis ◽

Numerical Model ◽

High Performance ◽

Experimental Testing ◽

Shear Capacity ◽

Numerical Results ◽

Fiber Reinforced Concrete ◽

Shear Behaviour ◽

Segmental Bridges

Abstract Although ultra-high performance fiber reinforced concrete (UHPFRC) has been used recently as a sustainable construction technique for many precast segmental bridges (PSBs), no exhaustive numerical and experimental studies exist to assess the shear capacity and failure pattern of the joints in these bridges. Hence, to accurately investigate the shear behavior of the joints in UHPFRC precast segmental bridges, a numerical analysis model based on finite-element code was established in this study. Concrete damaged plasticity model was used to analyze the UHPFRC joint models by considering all the geometries, boundaries, interactions and constraints. In this paper, the numerical model was calibrated by two full-scale UHPFRC keyed dry and epoxy joints under confining pressure effect. The excellent agreement between the numerical results and experimental data demonstrated the reliability of the proposed numerical model. The validated numerical model was then utilized to investigate the parameters affecting shear behaviour of the joints in PSBs. For this purpose, 12 FE models were analyzed under different variable parameters namely, number of shear keys, confining stress, and types of joints (dry or epoxy). Furthermore, the numerical results were also compared with the five existing shear design provision models available in literature in terms of ultimate shear capacity.

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Numerical Analysis of the E-Type Diaphragm Based on ANSYS

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.623.34 ◽

2014 ◽

Vol 623 ◽

pp. 34-40

Author(s):

Li Na Song ◽

Jun Shao ◽

De Quan Feng ◽

Wei Fan

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Analysis ◽

Numerical Model ◽

Pressure Sensor ◽

Element Model ◽

Uniform Pressure ◽

Sensing Element ◽

Element Simulation ◽

The Finite Element Model

With finite element method, the numerical model of the E-type diaphragm was built in this paper. Based on the model, we got the shear strain law of the E-type diaphragm surface under uniform pressure. Taking it as elastic element and the FBG as sensing element, we made a FBG pressure sensor and obtained the experiment result. The result fit well with finite element simulation value. It shows that the finite element model in the paper is reasonable and effective. The model can be used to design and optimize the sensor.

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Field measurements and analysis of a large-diameter flexible culvert

Canadian Geotechnical Journal ◽

10.1139/t93-012 ◽

1993 ◽

Vol 30 (1) ◽

pp. 135-145 ◽

Cited By ~ 2

Author(s):

P. M. Byrne ◽

T. Srithar ◽

C. B. Kern

Keyword(s):

Finite Element ◽

Soil Structure ◽

Soil Cover ◽

Large Diameter ◽

Field Measurements ◽

Nonlinear Finite Element ◽

Original Structure ◽

Soil Arching ◽

Element Analysis ◽

Soil Arch

This paper describes field measurements and analysis carried out on the Elkhart Creek soil–arch culvert structure in British Columbia, Canada. The structure has a span of 13.4 m, a rise of 7.3 m, and a soil cover of 9.6 m. The original structure collapsed during backfilling in October 1987. A new structure of the same design was built in the fall of 1989, and because of controversy regarding the design thrust value, it was instrumented to measure thrust and displacements in the arch. Displacements and stresses in the soil were also measured. The measured thrust values were much lower than expected and indicated that significant positive soil arching occurred, similar to that observed at the Vieux Comptoir soil–stucture in Quebec in 1975. A nonlinear finite element analysis of the soil–structure system was carried out simulating the construction procedures used, and the computed response was compared with the measurements. The computed and observed responses were in reasonable agreement in all aspects, namely thrust, displacements, and soil stresses, provided an allowance was made for slip at the bolted connections. Key words : culvert, finite element, arching, stress, displacements.

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Numerical modelling of the hydrogeological and geomechanical behaviour of a large slope movement: the Triesenberg landslide (Liechtenstein)

Canadian Geotechnical Journal ◽

10.1139/t07-028 ◽

2007 ◽

Vol 44 (7) ◽

pp. 840-857 ◽

Cited By ~ 22

Author(s):

B François ◽

L Tacher ◽

Ch. Bonnard ◽

L Laloui ◽

V Triguero

Keyword(s):

Finite Element ◽

Numerical Modelling ◽

Pore Water Pressure ◽

Water Pressure ◽

Temporal Distribution ◽

Field Measurements ◽

Slope Movement ◽

Three Dimensions ◽

Hydrogeological Model ◽

Modified Cam Clay

Using advanced hydrogeological and geomechanical finite element modelling, it has been possible to model the mechanical behaviour of a large slope movement, the Triesenberg landslide. This slope is located along the Rhine valley in the Principality of Liechtenstein and covers an area of around 5 km2, which includes two villages. Pore-water pressure fields calculated by the hydrogeological model were used as input for the geomechanical model. The results obtained through numerical simulation agree fairly well with field measurements of peak velocity, spatial and temporal distribution of velocity, and total displacements. Such results were obtained using a modified Cam-Clay elastoplastic constitutive model for which the required material parameters were obtained through careful geotechnical tests. These finite element models were carried out in two and three dimensions to gradually improve the understanding of the physical phenomena governing the hydrogeological conditions and the movements of the slope.Key words: landslides, slope movement, hydromechanical coupling, elastoplasticity, numerical modelling.

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