Research on damage identification method of composite beams based on dynamic macro-strain under impact load
In order to achieve damage identification of steel-concrete composite beams based on distributed long-gauge fiber bragg grating (FBG) sensors, model tests and finite element analysis of composite beams under impact loads were conducted. The damage assessment index βn constructed from the dynamic mac...
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Hebei University of Science and Technology
2025-08-01
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| Series: | Journal of Hebei University of Science and Technology |
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| Online Access: | https://xuebao.hebust.edu.cn/hbkjdx/article/pdf/b202504011?st=article_issue |
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| author | Yunsheng LI Ding HE Xiaoyuan JIA Chunlei CUI Xueliang Rong Yanling ZHANG |
| author_facet | Yunsheng LI Ding HE Xiaoyuan JIA Chunlei CUI Xueliang Rong Yanling ZHANG |
| author_sort | Yunsheng LI |
| collection | DOAJ |
| description | In order to achieve damage identification of steel-concrete composite beams based on distributed long-gauge fiber bragg grating (FBG) sensors, model tests and finite element analysis of composite beams under impact loads were conducted. The damage assessment index βn constructed from the dynamic macro-strain spectral amplitude was used to identify damage of steel girder section and stud connections, respectively. The research results show that when long-gauge FBG sensors are continuously arranged along the longitudinal direction on the bottom surface of steel girder, the macro-strain of the sensors in the damaged area increases significantly. When the evaluation index βn>0, it can be determined that cross-sectional damage has occurred within the range of the sensor, and this index is more sensitive to the crack height on the web of the steel girder than the expansion width on the bottom flange. For stud damage, long-gauge sensors can be arranged in pairs symmetrically on both the upper and lower surfaces of the interface in concrete slab and steel girder, and the measured macro-strain time history can be subtracted to obtain the slip macro-strain time history. Then, based on the evaluation index βn obtained from the amplitude of the slip macro-strain spectrum, and using the two-stage identification method, the location of damaged stud can be identified effectively. Overall, reasonable arrangement of the distributed long-gauge sensors can realize damage identification of different components in steel-concrete composite beams, especially the connectors which are concealed in the concrete slab. |
| format | Article |
| id | doaj-art-38cbac3a26ca470ca54d1345375a97f2 |
| institution | DOAJ |
| issn | 1008-1542 |
| language | zho |
| publishDate | 2025-08-01 |
| publisher | Hebei University of Science and Technology |
| record_format | Article |
| series | Journal of Hebei University of Science and Technology |
| spelling | doaj-art-38cbac3a26ca470ca54d1345375a97f22025-08-20T03:13:39ZzhoHebei University of Science and TechnologyJournal of Hebei University of Science and Technology1008-15422025-08-0146445346310.7535/hbkd.2025yx04011b202504011Research on damage identification method of composite beams based on dynamic macro-strain under impact loadYunsheng LI0Ding HE1Xiaoyuan JIA2Chunlei CUI3Xueliang Rong4Yanling ZHANG5School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaRoad and Bridge Technology Company Limited of China Communications Construction, Shijiazhuang, Hebei 050000, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaSchool of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, ChinaIn order to achieve damage identification of steel-concrete composite beams based on distributed long-gauge fiber bragg grating (FBG) sensors, model tests and finite element analysis of composite beams under impact loads were conducted. The damage assessment index βn constructed from the dynamic macro-strain spectral amplitude was used to identify damage of steel girder section and stud connections, respectively. The research results show that when long-gauge FBG sensors are continuously arranged along the longitudinal direction on the bottom surface of steel girder, the macro-strain of the sensors in the damaged area increases significantly. When the evaluation index βn>0, it can be determined that cross-sectional damage has occurred within the range of the sensor, and this index is more sensitive to the crack height on the web of the steel girder than the expansion width on the bottom flange. For stud damage, long-gauge sensors can be arranged in pairs symmetrically on both the upper and lower surfaces of the interface in concrete slab and steel girder, and the measured macro-strain time history can be subtracted to obtain the slip macro-strain time history. Then, based on the evaluation index βn obtained from the amplitude of the slip macro-strain spectrum, and using the two-stage identification method, the location of damaged stud can be identified effectively. Overall, reasonable arrangement of the distributed long-gauge sensors can realize damage identification of different components in steel-concrete composite beams, especially the connectors which are concealed in the concrete slab.https://xuebao.hebust.edu.cn/hbkjdx/article/pdf/b202504011?st=article_issuecomposite structure; steel-concrete composite beam; damage identification; dynamic macro-strain; fiber bragg grating sensors; impact load |
| spellingShingle | Yunsheng LI Ding HE Xiaoyuan JIA Chunlei CUI Xueliang Rong Yanling ZHANG Research on damage identification method of composite beams based on dynamic macro-strain under impact load Journal of Hebei University of Science and Technology composite structure; steel-concrete composite beam; damage identification; dynamic macro-strain; fiber bragg grating sensors; impact load |
| title | Research on damage identification method of composite beams based on dynamic macro-strain under impact load |
| title_full | Research on damage identification method of composite beams based on dynamic macro-strain under impact load |
| title_fullStr | Research on damage identification method of composite beams based on dynamic macro-strain under impact load |
| title_full_unstemmed | Research on damage identification method of composite beams based on dynamic macro-strain under impact load |
| title_short | Research on damage identification method of composite beams based on dynamic macro-strain under impact load |
| title_sort | research on damage identification method of composite beams based on dynamic macro strain under impact load |
| topic | composite structure; steel-concrete composite beam; damage identification; dynamic macro-strain; fiber bragg grating sensors; impact load |
| url | https://xuebao.hebust.edu.cn/hbkjdx/article/pdf/b202504011?st=article_issue |
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