Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations
This study established an inversion based on a fishbone model to estimate physical parameters from the responses of elastic building structures subjected to an earthquake. A fishbone model, which has rotational springs and dashpots in addition to the elements in a lumped mass model, is effective for...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2023-07-01
|
| Series: | Frontiers in Built Environment |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fbuil.2023.1201048/full |
| _version_ | 1827897291722194944 |
|---|---|
| author | Koichi Kajiwara Akiko Kishida Jun Fujiwara Ryuta Enokida |
| author_facet | Koichi Kajiwara Akiko Kishida Jun Fujiwara Ryuta Enokida |
| author_sort | Koichi Kajiwara |
| collection | DOAJ |
| description | This study established an inversion based on a fishbone model to estimate physical parameters from the responses of elastic building structures subjected to an earthquake. A fishbone model, which has rotational springs and dashpots in addition to the elements in a lumped mass model, is effective for demonstrating structural rotations that happen at the connections of columns and beams. This model is commonly applied to computational calculations of seismic responses of structures and is classified into a forward problem obtaining responses from known systems and excitations. Although its effectiveness for the forward problem has been well demonstrated, it has rarely been applied to the inverse problem, where structural properties are estimated from known responses and excitations. First, this study inverted multi/single-mass-system fishbone models. Then, the inversion was applied to an elastic fishbone model of a 3-mass system, which was built based on an E-Defense shaking table experiment, and its structural responses were numerically simulated. This numerical simulation demonstrated its effectiveness for accurately estimating parameters in the fishbone model of the 3-mass system, especially when its structural responses are not contaminated by noises. Lastly, it was applied to responses containing some noise to examine its influence on the estimation accuracy. The estimation accuracy of damping elements was found to be sensitive to noise, whereas that of stiffness was more insensitive than the damping elements. The proposed inversion is particularly suitable for estimating rotational stiffness, which is not obtainable from the inversion of lumped mass systems. |
| first_indexed | 2024-03-12T22:47:03Z |
| format | Article |
| id | doaj.art-4879d0c0548e440aaf8a63aa39fa3c4c |
| institution | Directory Open Access Journal |
| issn | 2297-3362 |
| language | English |
| last_indexed | 2024-03-12T22:47:03Z |
| publishDate | 2023-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Built Environment |
| spelling | doaj.art-4879d0c0548e440aaf8a63aa39fa3c4c2023-07-21T03:35:12ZengFrontiers Media S.A.Frontiers in Built Environment2297-33622023-07-01910.3389/fbuil.2023.12010481201048Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitationsKoichi Kajiwara0Akiko Kishida1Jun Fujiwara2Ryuta Enokida3Earthquake Disaster Mitigation Research Division, National Research Institute for Earth Science and Disaster Resilience, Miki, Hyogo, JapanEarthquake Disaster Mitigation Research Division, National Research Institute for Earth Science and Disaster Resilience, Miki, Hyogo, JapanEarthquake Disaster Mitigation Research Division, National Research Institute for Earth Science and Disaster Resilience, Miki, Hyogo, JapanInternational Research Institute of Disaster Science, Tohoku University, Sendai, Miyagi, JapanThis study established an inversion based on a fishbone model to estimate physical parameters from the responses of elastic building structures subjected to an earthquake. A fishbone model, which has rotational springs and dashpots in addition to the elements in a lumped mass model, is effective for demonstrating structural rotations that happen at the connections of columns and beams. This model is commonly applied to computational calculations of seismic responses of structures and is classified into a forward problem obtaining responses from known systems and excitations. Although its effectiveness for the forward problem has been well demonstrated, it has rarely been applied to the inverse problem, where structural properties are estimated from known responses and excitations. First, this study inverted multi/single-mass-system fishbone models. Then, the inversion was applied to an elastic fishbone model of a 3-mass system, which was built based on an E-Defense shaking table experiment, and its structural responses were numerically simulated. This numerical simulation demonstrated its effectiveness for accurately estimating parameters in the fishbone model of the 3-mass system, especially when its structural responses are not contaminated by noises. Lastly, it was applied to responses containing some noise to examine its influence on the estimation accuracy. The estimation accuracy of damping elements was found to be sensitive to noise, whereas that of stiffness was more insensitive than the damping elements. The proposed inversion is particularly suitable for estimating rotational stiffness, which is not obtainable from the inversion of lumped mass systems.https://www.frontiersin.org/articles/10.3389/fbuil.2023.1201048/fulltime domain inversionfishbone modelphysical parameter estimationsystem identificationstructural health monitoring |
| spellingShingle | Koichi Kajiwara Akiko Kishida Jun Fujiwara Ryuta Enokida Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations Frontiers in Built Environment time domain inversion fishbone model physical parameter estimation system identification structural health monitoring |
| title | Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| title_full | Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| title_fullStr | Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| title_full_unstemmed | Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| title_short | Fishbone model-based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| title_sort | fishbone model based inversion to estimate physical parameters of elastic structures under earthquake excitations |
| topic | time domain inversion fishbone model physical parameter estimation system identification structural health monitoring |
| url | https://www.frontiersin.org/articles/10.3389/fbuil.2023.1201048/full |
| work_keys_str_mv | AT koichikajiwara fishbonemodelbasedinversiontoestimatephysicalparametersofelasticstructuresunderearthquakeexcitations AT akikokishida fishbonemodelbasedinversiontoestimatephysicalparametersofelasticstructuresunderearthquakeexcitations AT junfujiwara fishbonemodelbasedinversiontoestimatephysicalparametersofelasticstructuresunderearthquakeexcitations AT ryutaenokida fishbonemodelbasedinversiontoestimatephysicalparametersofelasticstructuresunderearthquakeexcitations |