INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS
Dynamics of beam structures subjected to various loads have been investigated for over a century. The importance of such a problem arises in the structural design of bridges in whi...
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| Format: | Article |
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Sharif University of Technology
2017-05-01
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| Series: | مهندسی عمران شریف |
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| Online Access: | https://sjce.journals.sharif.edu/article_1119_71627ede4c6bbd5600fae3d94abbdf5a.pdf |
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| author | A. Nikkhoo A. Bahrami Eskandari F. Rahimzadeh Rofooei |
| author_facet | A. Nikkhoo A. Bahrami Eskandari F. Rahimzadeh Rofooei |
| author_sort | A. Nikkhoo |
| collection | DOAJ |
| description | Dynamics of beam structures subjected to various loads have been investigated for over a century. The importance of such a problem arises in the structural design of bridges in which the nature of loading could affect the design parameters substantially. It has been observed that as a bridge structure is subjected to moving masses and earthquake loading, the dynamic deflection and
stresses can be significantly higher than those observed in the static case. Although only the horizontal component of earthquake excitation is taken into account in the modeling of bridges and parallel beams sustaining the bridge deck loads. there exist several pieces of evidences showing that some of the failure modes are in direct relation to the vertical one. Generally, in comparison with the horizontal component of earthquake, however, the vertical one has less power and most part of its influence occurs in a particular frequency domain that could be so destructive to the structures with natural frequency in these domains. In addition, there are clearly many problems of great physical significance in which the load inertia is not negligible and can significantly alter the dynamic behavior of the system; therefore, moving mass is the another important and affective dynamic loads in design of these routine bridges. In this article, the seismic effect of vertical earthquake on the bridges is studied aiming to explore the necessity of simultaneous acts of this force and the moving masses. By proving the intensifying effects of these loads combination via the obtained results, by employing a passive damper system, it is attempted to decrease the mentioned influences on the studied structure. Dampers are used in two ways. and the best one is chosen based on its performance in suppression of the beam deflection. Finally, through analyzing and comparing the results, a simple algorithm is introduced for reducing the sections' dimensions of the bridge structures under this type of loading. |
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| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T13:18:19Z |
| publishDate | 2017-05-01 |
| publisher | Sharif University of Technology |
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| series | مهندسی عمران شریف |
| spelling | doaj.art-43b7679ec6ab4bbaa4818431cad6e5f82023-08-26T10:21:34ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762017-05-0133.21.2354310.24200/j30.2017.11191119INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERSA. Nikkhoo0A. Bahrami Eskandari1F. Rahimzadeh Rofooei2Dept. of Civil Engineering University of Sience & CalturerDept. of Civil Engineering University of Sience & CalturerDept. of Civil Engineering Sharif University of TechnologyDynamics of beam structures subjected to various loads have been investigated for over a century. The importance of such a problem arises in the structural design of bridges in which the nature of loading could affect the design parameters substantially. It has been observed that as a bridge structure is subjected to moving masses and earthquake loading, the dynamic deflection and stresses can be significantly higher than those observed in the static case. Although only the horizontal component of earthquake excitation is taken into account in the modeling of bridges and parallel beams sustaining the bridge deck loads. there exist several pieces of evidences showing that some of the failure modes are in direct relation to the vertical one. Generally, in comparison with the horizontal component of earthquake, however, the vertical one has less power and most part of its influence occurs in a particular frequency domain that could be so destructive to the structures with natural frequency in these domains. In addition, there are clearly many problems of great physical significance in which the load inertia is not negligible and can significantly alter the dynamic behavior of the system; therefore, moving mass is the another important and affective dynamic loads in design of these routine bridges. In this article, the seismic effect of vertical earthquake on the bridges is studied aiming to explore the necessity of simultaneous acts of this force and the moving masses. By proving the intensifying effects of these loads combination via the obtained results, by employing a passive damper system, it is attempted to decrease the mentioned influences on the studied structure. Dampers are used in two ways. and the best one is chosen based on its performance in suppression of the beam deflection. Finally, through analyzing and comparing the results, a simple algorithm is introduced for reducing the sections' dimensions of the bridge structures under this type of loading.https://sjce.journals.sharif.edu/article_1119_71627ede4c6bbd5600fae3d94abbdf5a.pdfbridge structurevertical component of earthquake excitationmoving masspassive dampervibration suppression |
| spellingShingle | A. Nikkhoo A. Bahrami Eskandari F. Rahimzadeh Rofooei INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS مهندسی عمران شریف bridge structure vertical component of earthquake excitation moving mass passive damper vibration suppression |
| title | INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS |
| title_full | INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS |
| title_fullStr | INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS |
| title_full_unstemmed | INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS |
| title_short | INVESTIGATING VIBRATION IN BRIDGE STRUCTURES CAUSED BY VERTICAL EARTHQUAKE EXCITATION AND MOVING MASS EMPLOYING PASSIVE PIPE DAMPERS |
| title_sort | investigating vibration in bridge structures caused by vertical earthquake excitation and moving mass employing passive pipe dampers |
| topic | bridge structure vertical component of earthquake excitation moving mass passive damper vibration suppression |
| url | https://sjce.journals.sharif.edu/article_1119_71627ede4c6bbd5600fae3d94abbdf5a.pdf |
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