Ground Anchors : Tension Force—Vibratory Analysis / by Jean-Jacques Henri Rincent.

Format:

Book

Author/Creator:

Rincent, Jean-Jacques Henri.

Language:

English

Subjects (All):

Statics.

Mechanics, Applied.

Mechanics.

Mechanical Statics and Structures.

Engineering Mechanics.

Classical Mechanics.

Local Subjects:

Mechanical Statics and Structures.

Engineering Mechanics.

Classical Mechanics.

Physical Description:

1 online resource (158 pages)

Edition:

1st ed. 2024.

Place of Publication:

Singapore : Springer Nature Singapore : Imprint: Springer, 2024.

Summary:

This open access book introduces a non-destructive vibration analysis method for calculating the internal tension force of tested tie rods. This method was formalized in 2003 and patented after two years of investigation, with the patent expiring in 2005. The objective of the book is to present this method through numerous concrete examples. It covers the theory and principles of instrumentation, explaining how vibratory responses are analyzed to calculate the free and total lengths of the tie rod, as well as its diameter, which includes the reinforcement and its grout. The data obtained from this method can be utilized to: Verify that tie rods adhere to drawings Resize tie rods A notable strength of this book lies in demonstrating the relationship between dynamic stiffness and the tension force of the tie rod, along with the calibration method using static tensile tests. However, performing static tensile tests at heights poses difficulties due to equipment weight, and there is a genuine risk of failure, especially for older tie rods. The book addresses important aspects such as the uncertainty of results and sampling. The examples provided in the book primarily stem from tests conducted in Brazil, where more than 2,000 tie rods were tested over a two-year period on motorway and railway retaining walls. In practical terms, this amounts to 16,000 non-destructive tests as each tie rod is tested eight times. These aging structures, in existence for several decades, exhibit load losses ranging from 1% to 5.5% per year during these periods. The book acknowledges the observation of cyclic load effects on these reinforcements, which warrant further investigation. In one of the tested walls, a limited number of tie rods were re-tensioned. Retaining wall managers increasingly employ this method for maintenance diagnostics. It allows for a representative sample to be taken, providing insight into the existing conditions.

Contents:

Introduction

Waves- Vibratory analysis

Phases of work

Steels

Length of the tie rods

Dynamic stiffness

Diameter of the tie-rod with its cement grout

Horizontal anchors

Earth pressure

Statics Tests

Interest of ND tests

Corrosion

Load cells

Fatigue phenomenon

Loss of tension

Re-tensioning

Sampling

Static and dynamic tests

Accuracy of measurements

Examples

Conclusions.

ISBN:

9789819744145