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Related Concept Videos

Design Consideration01:22

Design Consideration

312
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...
312
Design of Columns under a Centric Load01:17

Design of Columns under a Centric Load

180
The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
180
Design of Columns under an Eccentric Load01:21

Design of Columns under an Eccentric Load

683
Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
683
Eccentric Loading01:16

Eccentric Loading

480
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
480
Impact Loading01:19

Impact Loading

267
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
267
Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

703
Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
703

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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Reliability-based load and resistance factor design model for energy piles.

Biao Hu1, Quanmei Gong2,3, Yueqiang Zhang4

  • 1College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

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|August 29, 2022
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Summary

This study introduces a simplified Load and Resistance Factor Design (LRFD) approach for energy piles, making probabilistic design more accessible for engineers. The new method accounts for thermal loading effects on pile settlement, enhancing geotechnical engineering practices.

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Area of Science:

  • Geotechnical Engineering
  • Sustainable Energy Systems
  • Thermal Energy Storage

Background:

  • Energy piles integrate foundation support with ground source heat pump functions.
  • Existing probabilistic design methods for energy piles are often complex for practical engineering application.
  • Cyclic thermal loading can significantly impact energy pile performance and settlement.

Purpose of the Study:

  • To develop a simplified Load and Resistance Factor Design (LRFD) approach for the geotechnical design of energy piles.
  • To investigate the influence of cyclic thermal loading on energy pile settlement using a developed load-transfer model.
  • To implement LRFD procedures based on reliability methods into optimization problems for practical design.

Main Methods:

  • Development of a load-transfer model to analyze thermal loading effects on pile settlement.
  • Implementation of LRFD procedures using first-order reliability and target reliability methods.
  • Formulation of constrained nonlinear optimization problems for LRFD implementation.

Main Results:

  • A simplified LRFD model for energy pile geotechnical design has been proposed.
  • The study quantifies the effect of cyclic thermal loading on pile settlement.
  • The LRFD procedures were successfully demonstrated through an example pile and parametric analyses.

Conclusions:

  • The presented LRFD approach offers a more accessible alternative to complex probabilistic methods for energy pile design.
  • The developed model effectively captures the impact of thermal cycling on pile behavior.
  • This research provides a practical framework for the reliable geotechnical design of energy piles.