For prestressed concrete structures, it is important to apply and maintain the required tensile force of the prestressing cable. During the construction and in the service period, in order to
Request PDF | Monitoring of prestressing forces in cross-tensioned concrete pavements during construction and maintenance based on distributed optical fiber sensing | Accurate monitoring
This research paper analyses the ability of an easy-to-install distributed acoustic sensing (DAS) monitoring system using fibre optics to identify and locate the acoustic signal produced by the
In this method, optical fiber sensor-embedded strands are used to evaluate the distribution of tensile force of PC cables.
A reinforcing cable for a prestressed concrete structure is disclosed. The cable has an optical fiber entwined between the twisted wire ropes that form the cable. The optical fiber...
Prestressing with internal cables is not practical for the precast concrete slabs because there exist transverse joints between each precast slab. On the other hand, longitudinal prestressing
Abstract Accurate monitoring of prestressing force is crucial for cross-tensioned concrete pavements (CTCPs). This paper presents a method for monitoring prestressing forces in CTCPs
The girder was equipped with distributed fiber optic sensors (DFOS) prior to casting, as DFOS provide detailed insights into the structure''s inner with unprecedented spatial resolution. The
Brillouin optical time domain reflectometry strain sensor cables were installed to the underside of the prestressing strands using plastic cable ties.
A prototype system consisting of several sensing units, a fiber optic cable, and a BOFDA measurement device was developed, as shown in Fig. 8. The specifications of the BOFDA
When installed along the length of post-tensioned tendons in concrete structures, optical fiber sensors provide a promising means to overcome the existing challenges of tendon force
High Stress Monitoring of Prestressing Tendons in Nuclear Concrete Vessels using Fiber-Optic Sensors M. Perry †a, Z. Yan b, Z. Sun b, L. Zhang b, P. Niewczas a, M. Johnston c
Webb et al. performed direct comparison of strain measurements from fibre optic sensors along the prestressing strands and predictions from two different empirical prediction models
Fiber optic sensors represent an innovative technology for automated measurement of cable forces which are critical in construction and operation of many civil engineering structures.
Given the analysis above, an optical–electrical co-sensing CFRP cable (OECS-CFRP cable) was designed and manufactured in this paper. It consists of a new anchorage system and five CFRP
In this study, the measuring method was applied to the external cables of an actual PC bridge over 1 km in length to evaluate the distribution of tensile force applied to the PC cables during construction.
The glass core in fibre optic cables has an amorphous structure that results in the scattering of light signals sent through them. In telecommunications, this causes attenuation of the
Maintaining the structural health of prestressed concrete nuclear containments is a key element in ensuring nuclear reactors are capable of meeting their safety requirements. This paper
Based on the proposed system, a detailed analysis of the strain transfer and interaction between the concrete, cable duct, injection and prestressing tendon, is possible.
Evaluation of Distribution of Tensile Force on External Prestressing Cable Using Fiber Optic Measuring Method
For the safety of prestressed structures, prestress loss is a critical issue that will increase with structural damage, so it is necessary to investigate prestress loss of prestressed structures
Furthermore, the prestressing loss occurred in post-tensioning cable can be calculated. The initial prestressing loss of steel strand is 8.98% and the initial prestressing loss of AFRP cable is
Once the splicing procedure is performed at each end of both optical fiber cables embedded in the epoxy coating of the prestressing strand, the appropriate connections can be made to develop the
The experimental results showed that the fiber optic distributed sensor holds high accuracy, and the relative deviation of the measurement results between fiber optic sensor and strain
The researchers concluded that the use of optical fiber sensor–embedded prestressing strands combined with BOTDR provides, within limitations, a feasible and reliable means for monitoring the
The first case concerns the optimization of two sets of cable domes: a first set made of cables and vertical struts (stabilized through an appropriate level of prestress), and a second one
PDF | On Mar 1, 2014, M. Perry and others published High stress monitoring of prestressing tendons in nuclear concrete vessels using fibre-optic sensors | Find,
The authors of installed optical sensors based on the fiber Bragg grating technology inside prestressing strands to monitor the post-tensioning
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