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Ductile behavior of existing internal end diaphragms in steel tub girder bridges

Dolati, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcsr.2018.10.019
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. In steel tub girder bridges, end diaphragms transmit vertical and lateral loads to the substructure. Vulnerable response of steel diaphragms in recent strong ground motions has encouraged the researchers to work on their application as seismic force reducing devices for design and retrofitting of bridges. This study is an attempt to achieve a ductile diaphragm behavior under seismic actions by using existing internal end plate diaphragm of steel tub girder bridges. Considerable elastic stiffness and dominant shear behavior of the end diaphragm has made it a suitable choice for such behavior under seismic actions. Nonlinear quasi-static analyses using nineteen different finite element models were conducted to evaluate the internal end diaphragm behavior with different configurations and boundary elements. Moreover, plastic analyses using tension strips theory were used to derive formulations for design base shear and tension field inclination of different models. The calculated values were in agreement with the results of finite element models. As a result, remarkable response modification factor was derived for the proposed ductile system. In addition, nonlinear time history analyses were used to prove the ductile behavior of the selected models under real moderate and strong ground motions. © 2018 Elsevier Ltd
  6. Keywords:
  7. Ductile diaphragm ; Internal end diaphragm ; Seismic design ; Tub girder bridge ; Bridges ; Earthquakes ; Finite element method ; Surface tension ; Boundary elements ; Design base shears ; Elastic stiffness ; Girder bridges ; Nonlinear time history analysis ; Quasi static analysis ; Response modification factors ; Strong ground motion ; Diaphragms
  8. Source: Journal of Constructional Steel Research ; Volume 153 , 2019 , Pages 356-371 ; 0143974X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0143974X18306990