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Related Concept Videos

Design Consideration01:22

Design Consideration

192
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
192
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

116
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
116
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

195
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
195
Method of Superposition01:20

Method of Superposition

896
The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
896
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

319
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
319
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

202
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
202

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Comparative Analysis and Safety Evaluation of Shield Segment Structure Model under Surcharge Loading.

Xiaofeng Liu1, Yan Jiang1, Xiaolong Li1

  • 1School of Water Conservancy and Transportation, Zhengzhou University, 100 Science Avenue, Zhengzhou 450001, China.

Materials (Basel, Switzerland)
|October 28, 2023
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Summary

The shell-spring model accurately predicts shield tunnel segment behavior under surcharge loads, outperforming the beam-spring model. Controlling surface loads is crucial for tunnel safety and longevity.

Keywords:
beam–spring modelsafety evaluationshell–spring modelshield segmentsurcharge loading

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Area of Science:

  • Geotechnical Engineering
  • Structural Analysis
  • Tunneling Technology

Background:

  • Accurate mechanical response models for shield tunnel segments are vital for project design and cost-effectiveness.
  • Existing shell-spring and beam-spring models have unclear comparative accuracy under surcharge loads.

Purpose of the Study:

  • To establish and compare shell-spring and beam-spring models for shield tunnel segment analysis.
  • To clarify the differences in internal forces and deformation calculations between the two models.
  • To evaluate the reliability of the models against field measurements and assess segment safety.

Main Methods:

  • Development of shell-spring and beam-spring models based on a real subway shield tunnel project.
  • Verification of model reliability through comparison with field measurements and model test data.
  • Evaluation of segment structure safety using ultimate bearing capacity analysis.

Main Results:

  • The shell-spring model revealed a non-plane strain state in segments, with internal forces decreasing towards the center.
  • The beam-spring model yielded higher internal forces, particularly bending moments, compared to the shell-spring model.
  • Model discrepancies decreased with increasing surcharge load; shell-spring results closely matched field data.

Conclusions:

  • The shell-spring model is more accurate and reliable for calculating the mechanical response of shield tunnel segments.
  • Increasing surcharge loads reduce shield tunnel safety, necessitating reasonable load control.
  • Findings offer a reference for future shield tunnel lining design and optimization.