Uplift of Sewer Pipes Caused by Earthquake-Induced Liquefaction of Surrounding Soil

This paper presents current research on impedance-based structural health monitoring technique. The basic principle behind this technique is to apply high-frequency structural excitations (typically higher than 30 kHz) through the surface-bonded piezoelectric transducers, and measure the impedance of structures by monitoring the current and voltage applied to the piezoelectric transducers. Changes in impedance indicate changes in the structure, which in turn can indicate that damage has occurred. Three examples, including a bolted joint, gas pipeline, and composite structure, are presented to illustrate the effectiveness of this health monitoring technique to a wide variety of practical field applications. Although many proof-of-concept experiments have been performed using the impedance methods, the impedance-measuring device (HP4194A) is still bulky and expensive. Therefore, an operational amplifier-based turnkey device that can measure and record the electric impedance of a PZT has been developed. The performance of this miniaturized and portable device has been compared to our previous results and its effectiveness has been demonstrated. This paper summarizes the experimental setup, procedures, and considerations needed to implement the device in field applications.

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Section: Pipeline Experimentsmentioning

confidence: 99%

Improving Accessibility of the Impedance-Based Structural Health Monitoring Method

Peairs

Park²,

Inman

2004

Journal of Intelligent Material Systems and Structures

253

171

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“…Pipelines are also required for economic and community recovery after natural disasters. However, pipelines are severely damaged by shaking, liquefaction, and landslides during earthquakes [11][12][13] and the immediate assessment of pipeline facilities is critical to prevent ÿres, explosions, and pollution from broken gas or sewage lines. Although extensive research e orts have been focused on assessing the conditions of pipelines after earthquakes [14; 15] the condition monitoring of these structures is still based on limited information, without the deÿnite means to assess the states of these structures.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Feasibility of using impedance‐based damage assessment for pipeline structures

Park

Cudney

Inman

2001

Earthq Engng Struct Dyn

248

130

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SUMMARYThis paper presents the feasibility of using an impedance-based health monitoring technique in monitoring a critical civil facility. The objective of this research is to utilize the capability of the impedance method in identifying structural damage in those areas where a very quick condition monitoring is urgently needed, such as in a post-earthquake analysis of a pipeline system. The basic principle behind this technique is to utilize high-frequency structural excitation (typically greater than 30 kHz) through surface-bonded piezoelectric sensors=actuators to detect changes in structural point impedance due to the presence of damage. Real-time damage detection in pipes connected by bolted joints was investigated, and the capability of the impedance method in tracking and monitoring the integrity of the typical civil facility has been demonstrated. Data collected from the tests illustrates the capability of this technology to detect imminent damage under normal operating conditions and immediately after a natural disaster.

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“…In the past two decades, various authors have studied the problem of liquefaction-induced uplift of pipelines (Koseki et al, 1998). Despite being covered and protected by the surrounding soil, pipelines are subject to important uplift in the liquefied soil.…”

Section: Introductionmentioning

confidence: 99%

New mitigation method for pipeline uplift during seismic event

Taeseri

Laue

Otsubo

et al. 2016

Geotechnical Research

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The Tohoku earthquake in 2011 caused several damages to the pipeline network in the Tokyo Bay area. Predominantly, the main damages were noticed in the artificial islands, where liquefaction destroyed and deformed numerous embedded pipelines. During a seismic event, lifeline systems are subjected to buoyancy forces in the liquefied soil, causing permanent deformations to pipelines and interrupting their serviceability. The current mitigation methods (backfill improvement) are not suitable for regions prone to future earthquakes because pipe excavation and improvement is time-consuming and costly. Therefore, the aim of this study is to present a new effective mitigation method: the so-called horn-type structure. This innovative mitigation method was analysed with different analytical, experimental and numerical methods.

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Uplift of Sewer Pipes Caused by Earthquake-Induced Liquefaction of Surrounding Soil

Cited by 25 publications

References 2 publications

Improving Accessibility of the Impedance-Based Structural Health Monitoring Method

Improving Accessibility of the Impedance-Based Structural Health Monitoring Method

Feasibility of using impedance‐based damage assessment for pipeline structures

New mitigation method for pipeline uplift during seismic event

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