Distributed strain monitoring of two-way slabs
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Authors
Nurmi, Sara
Hoult, Neil A.
Howell, Simon D.
Date
2019
Type
journal article
Language
en
Keyword
Reinforced concrete , Two-way slabs , Distributed strain sensing , Membrane action
Alternative Title
Abstract
Two-way slab design and assessment is often based on conservative approaches due to a lack of data regarding slab behaviour. Distributed fibre optic strain sensors have the potential to provide extensive data sets for both lab experiments and field assessments. A proof of concept study was undertaken that involved four two-way slabs, with varying reinforcement ratios and levels of axial restraint, that were instrumented with distributed fibre optic strain sensors and tested under a central point load. The slabs with less reinforcement demonstrated a ductile flexural failure while the more heavily reinforced slabs failed due to punching shear. The axial restraint system developed for this research provided partial restraint and enhanced the capacity of both restrained specimens compared to the control specimens. The strain data enabled differences in support conditions (both vertical and axial) to be identified. Additionally, the data enabled the onset of reinforcement yielding to be captured and thus proved it to be a promising approach for measuring the beneficial of effects of membrane action. The results of the experiments were compared to a yield-line analysis and were found to be within 5% for the unrestrained specimens and within 10% for the axially restrained specimens despite the fact that two specimens failed in punching shear.
Description
The final publication is available at Elsevier via https://doi.org/10.1016/j.engstruct.2019.04.002 © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Citation
Nurmi, S., Hoult, N. A., & Howell, S. D. (2019). Distributed strain monitoring of two-way slabs. Engineering Structures, 189, 580-588.
Publisher
Elsevier