{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,11,19]],"date-time":"2024-11-19T18:38:53Z","timestamp":1732041533689},"reference-count":31,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2022,5,23]],"date-time":"2022-05-23T00:00:00Z","timestamp":1653264000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"Distributed fiber-optic sensing (DFOS) technologies have been used for decades to detect damage in infrastructure. One recent DFOS technology, Optical Frequency Domain Reflectometry (OFDR), has attracted attention from the structural engineering community because its high spatial resolution and refined accuracy could enable new monitoring possibilities and new insight regarding the behavior of reinforced concrete (RC) structures. The current research project explores the ability and potential of OFDR to measure distributed strain in RC structures through laboratory tests on an innovative beam\u2013column connection, in which a partial slot joint was introduced between the beam and the column to control damage. In the test specimen, fiber-optic cables were embedded in both the steel reinforcement and concrete. The specimen was tested under quasi-static cyclic loading with increasing displacement demand at the structural laboratory of the Pacific Earthquake Engineering Research (PEER) Center of UC Berkeley. Different types of fiber-optic cables were embedded both in the concrete and the rebar. The influence of the cable coating and cable position are discussed. The DFOS results are compared with traditional measurements (DIC and LVDT). The high resolution of DFOS at small deformations provides new insights regarding the mechanical behavior of the slotted RC beam\u2013column connection, including direct measurement of beam curvature, rebar deformation, and slot opening and closing. A major contribution of this work is the quantification of the performance and limitations of the DFOS system under large cyclic strains. Performance is quantified in terms of non-valid points (which occur in large strains when the DFOS analyzer does not return a strain value), maximum strain that can be reliably measured, crack width that causes cable rupture, and the effect of the cable coating on the measurements. Structural damage indices are also proposed based on the DFOS results. These damage indices correlate reasonably well with the maximum sustained drift, indicating the potential of using DFOS for RC structural damage assessment. The experimental data set is made publicly available.<\/jats:p>","DOI":"10.3390\/s22103957","type":"journal-article","created":{"date-parts":[[2022,5,25]],"date-time":"2022-05-25T04:14:14Z","timestamp":1653452054000},"page":"3957","source":"Crossref","is-referenced-by-count":5,"title":["Distributed Fiber-Optic Strain Sensing of an Innovative Reinforced Concrete Beam\u2013Column Connection"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-4327-9115","authenticated-orcid":false,"given":"Shenghan","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-8500-0610","authenticated-orcid":false,"given":"Han","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-4861-2896","authenticated-orcid":false,"given":"Esam","family":"Darwish","sequence":"additional","affiliation":[{"name":"Structural Engineering Department, Tanta University, Tanta 31527, Egypt"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-2988-2361","authenticated-orcid":false,"given":"Khalid M.","family":"Mosalam","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-6195-839X","authenticated-orcid":false,"given":"Matthew J.","family":"DeJong","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Rashidi, M., Mohammadi, M., Kivi, S.S., Abdolvand, M.M., Truong-Hong, L., and Samali, B. (2020). A decade of modern bridge monitoring using terrestrial laser scanning: Review and future directions. Remote Sens., 12.","DOI":"10.3390\/rs12223796"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1168","DOI":"10.1002\/stc.1831","article-title":"Bridge related damage quantification using unmanned aerial vehicle imagery","volume":"23","author":"Ellenberg","year":"2016","journal-title":"Struct. Control Health Monit."},{"key":"ref_3","first-page":"1","article-title":"Distributed fiber optics sensors for civil engineering infrastructure sensing","volume":"3","author":"Soga","year":"2018","journal-title":"J. Struct. Integr. Maint."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"103028","DOI":"10.1016\/j.jngse.2019.103028","article-title":"Distributed fibre optic strain sensing of an axially deformed well model in the laboratory","volume":"72","author":"Sasaki","year":"2019","journal-title":"J. Nat. Gas Sci. Eng."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Barrias, A., Casas, J.R., and Villalba, S. (2016). A review of distributed optical fiber sensors for civil engineering applications. Sensors, 16.","DOI":"10.3390\/s16050748"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"414692","DOI":"10.1155\/2012\/414692","article-title":"Performance evaluation of PPP-BOTDA-based distributed optical fiber sensors","volume":"8","author":"Zhang","year":"2012","journal-title":"Int. J. Distrib. Sens. Netw."},{"key":"ref_7","unstructured":"Haefliger, S., Mata-Falc\u00f3n, J., and Kaufmann, W. (2017, January 13\u201315). Application of distributed optical measurements to structural concrete experiments. Proceedings of the Fourth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures, Zurich, Switzerland."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"04019007","DOI":"10.1061\/(ASCE)ST.1943-541X.0002286","article-title":"Postyield bond deterioration and damage assessment of RC beams Using distributed fiber-optic strain sensing system","volume":"145","author":"Malek","year":"2019","journal-title":"J. Struct. Eng."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Bado, M., Casas, J., and Barrias, A. (2018). Performance of Rayleigh-Based Distributed Optical Fiber Sensors Bonded to Reinforcing Bars in Bending. Sensors, 18.","DOI":"10.3390\/s18093125"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"04021212","DOI":"10.1061\/(ASCE)ST.1943-541X.0003191","article-title":"Monitoring Reinforced Concrete Cracking Behavior under Uniaxial Tension Using Distributed Fiber-Optic Sensing Technology","volume":"147","author":"Liu","year":"2021","journal-title":"J. Struct. Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"104309","DOI":"10.1016\/j.jngse.2021.104309","article-title":"Distributed fiber optic strain sensing of bending deformation of a well mockup in the laboratory","volume":"96","author":"Sasaki","year":"2021","journal-title":"J. Nat. Gas Sci. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Bado, M.F., and Casas, J.R. (2021). A review of recent distributed optical fiber sensors applications for civil engineering structural health monitoring. Sensors, 21.","DOI":"10.3390\/s21051818"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3309","DOI":"10.1177\/1475921720984431","article-title":"Assessment and visualization of performance indicators of reinforced concrete beams by distributed optical fibre sensing","volume":"20","author":"Berrocal","year":"2021","journal-title":"Struct. Health Monit."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"e2664","DOI":"10.1002\/stc.2664","article-title":"Fiber optic sensing of concrete cracking and rebar deformation using several types of cable","volume":"28","author":"Zhang","year":"2021","journal-title":"Struct. Control Health Monit."},{"key":"ref_15","first-page":"97","article-title":"Distributed fiber optic sensing for crack detection in concrete structures","volume":"1","author":"Fischer","year":"2019","journal-title":"Civ. Eng. Des."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Zhang, S., Liu, H., Cheng, J., and DeJong, M.J. (2020). A mechanical model to interpret distributed fiber optic strain measurement at displacement discontinuities. Struct. Health Monit., 1475921720964183.","DOI":"10.1177\/1475921720964183"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1139\/l96-886","article-title":"Damage to concrete structures due to the 17 January 1995, Hyogo-ken Nanbu (Kobe) earthquake","volume":"23","author":"Mitchell","year":"1996","journal-title":"Can. J. Civ. Eng."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"285","DOI":"10.1007\/s10518-010-9204-8","article-title":"6th April 2009 L\u2019Aquila earthquake, Italy: Reinforced concrete building performance","volume":"9","author":"Ricci","year":"2011","journal-title":"Bull. Earthq. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"579","DOI":"10.12989\/sem.2006.23.5.579","article-title":"Seismic design of beam-column joints in RC moment resisting frames-Review of codes","volume":"23","author":"Uma","year":"2006","journal-title":"Struct. Eng. Mech."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1193\/1.1585263","article-title":"Cyclic behavior of large beam-column assemblies","volume":"1","author":"Popov","year":"1985","journal-title":"Earthq. Spectra"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"859","DOI":"10.1002\/eqe.4290230804","article-title":"Experimental observations on the seismic shear performance of RC beam-to-column connections subjected to varying axial column force","volume":"23","author":"Agbabian","year":"1994","journal-title":"Earthq. Eng. Struct. Dyn."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1686","DOI":"10.1061\/(ASCE)0733-9445(2003)129:12(1686)","article-title":"Modeling reinforced-concrete beam-column joints subjected to cyclic loading","volume":"129","author":"Lowes","year":"2003","journal-title":"J. Struct. Eng."},{"key":"ref_23","first-page":"523","article-title":"Shear Transfer Mechanism of Reinforced Concrete Beams with a Slot at the Beam-end","volume":"21","author":"Ohkubo","year":"1999","journal-title":"Annu. Pap. Concr. Eng."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Muir, C., Bull, D., and Pampanin, S. (2013, January 2\u20134). Seismic testing of the slotted beam detail for reinforced concrete structures. Proceedings of the Structures Congress 2013: Bridging Your Passion with Your Profession, Pittsburgh, PA, USA.","DOI":"10.1061\/9780784412848.228"},{"key":"ref_25","unstructured":"Darwish, E. (2022). Enhancing the Cyclic Behavior of Slotted RC Beam-Column Connection. [Ph.D. Thesis, Tanta University]."},{"key":"ref_26","unstructured":"Sakr, M., Seleemah, A., Khalifa, T., and Darwish, E. (2021, January 16\u201317). Experimental Investigation of Cyclic Performance of Slotted RC Beam Column Connection. Proceedings of the International Conference on Advances in Structural and Geotechnical Engineering, Barcelona, Spain."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Bado, M.F., Casas, J.R., Dey, A., and Berrocal, C.G. (2020). Distributed optical fiber sensing bonding techniques performance for embedment inside reinforced concrete structures. Sensors, 20.","DOI":"10.3390\/s20205788"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1002\/(SICI)1096-9845(199901)28:1<79::AID-EQE805>3.0.CO;2-J","article-title":"Response-based damage assessment of structures","volume":"28","author":"Ghobarah","year":"1999","journal-title":"Earthq. Eng. Struct. Dyn."},{"key":"ref_29","unstructured":"Applied Technology Council (1998). FEMA 306: Evaluation of Earthquake Damaged Concrete and Masonry Wall Buildings, Applied Technology Council (ATC)."},{"key":"ref_30","first-page":"290","article-title":"Plastic hinge length of reinforced concrete columns","volume":"105","author":"Bae","year":"2008","journal-title":"ACI Struct. J."},{"key":"ref_31","unstructured":"Moehle, J. (2014). Seismic Design of Reinforced Concrete Buildings, McGraw Hill Professional."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/10\/3957\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T04:17:36Z","timestamp":1722313056000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/10\/3957"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,5,23]]},"references-count":31,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2022,5]]}},"alternative-id":["s22103957"],"URL":"http:\/\/dx.doi.org\/10.3390\/s22103957","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2022,5,23]]}}}
