Analysis of probability of failure of prestressed concrete beams

Chandrasekar, P.; Dayaratnam, P.

doi:10.1016/0007-3628(75)90032-8

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…The resonant peaks were shifted to the rightward as the PS force was increased, suggesting an increase in natural frequencies of the EMI sensor. (2) The imaginary part of the EMI response showed consistent curves during the prestressing process, indicating the stable functionality of the designed smart strand. (3) The EMI features (RMSD and CCD) proportionally increased with the PS force.…”

mentioning

confidence: 86%

“…In practice, ξ ranges from 0 to 1. Equations ( 1), ( 3) and ( 4) show that the mechanical impedance of the substrate varies with the PS force of the strand while the measured EMI response at a particular frequency is a function of the mechanical impedance, according to Equation (2). Consequently, the measured EMI response in the frequency domain is expected to vary with the PS load.…”

Section: Theoretical Feasibility Of the Piezoelectric-based Smart Strandmentioning

confidence: 99%

“…After the completion of the construction process, the strand may suffer short-term and long-term PS loss over time as the result of multiple causes (e.g., concrete shrinkage and creep, corrosion and strand relaxation, flexural cracks). A severe drop in the PS force, if not timely detected, will significantly influence the bearing capacity of the prestressed structure, carrying the potential of catastrophic failure [2,3].…”

Section: Introductionmentioning

confidence: 99%

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A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

Phan

Nguyen

et al. 2021

Buildings

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This study proposes a cost-effective prestress monitoring method for post-tensioned reinforced concrete (RC) beams using a smart strand. Firstly, the concept of a piezoelectric-based smart strand and its implementation for prestress force monitoring are developed. The smart strand is prepared by embedding inexpensive and high-sensitivity electromechanical impedance (EMI) sensors in a steel strand. Next, the feasibility of the proposed method is experimentally verified for prestress force monitoring of a simple supported post-tensioned RC beam. A smart strand prototype is fabricated and embedded into a 6.4 m RC beam which is then prestressed with different levels. For each prestress level, the EMI responses of the smart tendon are measured and the EMI features are extracted for prestress force monitoring. The results showed that the EMI signals of the smart strand showed strong resonant peaks that varied sensitively to the prestress level of the beam. The prestress change in the prestressed RC beam was successfully estimated by using linear regression models of the EMI features.

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mentioning

confidence: 86%

Section: Theoretical Feasibility Of the Piezoelectric-based Smart Strandmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

Phan

Nguyen

et al. 2021

Buildings

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“…The prestressing force is an important parameter for the evaluation of structural integrity and damage assessment. The loss of prestress force would lead to a significant reduction in the flexural stiffness of the prestressed structure and eventually might cause catastrophic failures [1,2].…”

Section: Introductionmentioning

confidence: 99%

Anchor Force Monitoring Using Impedance Technique with Single-Point Mount Lead-Zirconate-Titanate Interface: A Feasibility Study

Huynh

2021

Buildings

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As a key load-bearing element in a prestressed structure, the anchor should be appropriately monitored to secure its as-built prestressing force. In previous studies, the impedance-based prestress force monitoring technique through a mountable lead–Zirconate–Titanate (PZT) interface was developed. However, the previous design of the PZT interface uses a two-point mount technique through two bonding layers, causing inconveniences during installation and replacement processes. To address this issue, we propose an alternative PZT interface model for prestress force monitoring based on the impedance method. The proposed model uses a single-point mounting technique that allows it to be more conveniently installed and replaced on a host structure. First, the electromechanical impedance of the proposed PZT interface is theoretically derived. The proof-of-concept of the proposed PZT interface for impedance monitoring is then shown by finite element modelling. Afterwards, a lab-scaled experiment is conducted on an anchoring system to demonstrate the practical application feasibility of the proposed technique. The obtained results show that the proposed technique can produce impedance responses that are highly sensitive to the prestress force. The performance of the proposed model for impedance-based prestress force monitoring is found to be comparable with the previous techniques (the washer-type mount and the two-point mount). Due to its advantage of simple design, the newly designed PZT interface is promising for the future development of the impedance-based anchor force monitoring systems in practice.

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“…A significant PS loss could cause a severe drop in the capacity of a prestressed structure, leading to possible structural failures. 3,4 The recent catastrophic collapse of the Gennoa Bridge in Italy has woken us about the important role of PS force monitoring and assessment for prestressed systems. 5 The early developed PS force monitoring approaches are based on formulating the relationship between the PS force and the natural frequencies of a prestressed structure.…”

Section: Introductionmentioning

confidence: 99%

Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

Nguyen

Hoang

Huynh

2022

Structural Contr & Hlth

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The concept of the piezoelectric-based smart strand has been recently developed for low-cost prestress force monitoring of post-tensioned structures. However, the previous study uses the single-degree-of-freedom system that is inadequate to describe multiple resonances in a realistic electromechanical impedance (EMI) signature. Furthermore, the EMI-based prestress force prediction has mostly relied on statistical regression models that are difficult to apply to existing prestressed structures, where the collection of EMI data in failure cases is almost impossible. In this study, we newly propose a highfidelity analytical EMI model for the smart strand technique and develop a simple model-update-based method for prestress force prediction. The experimental result shows that the proposed analytical model is capable to generate the realistic EMI response of multiple modes at a similar frequency band with identical patterns. Also, the prestress force in the smart strand can be reliably predicted by minimizing the gap between the analytical EMI response and the experimental data through a genetic algorithm-based model-updating process.

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Analysis of probability of failure of prestressed concrete beams

Cited by 8 publications

References 3 publications

A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

A Low-Cost Prestress Monitoring Method for Post-Tensioned RC Beam Using Piezoelectric-Based Smart Strand

Anchor Force Monitoring Using Impedance Technique with Single-Point Mount Lead-Zirconate-Titanate Interface: A Feasibility Study

Analytical impedance model for piezoelectric‐based smart Strand and its feasibility for prestress force prediction

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