PARAMETRIC STUDY ON DAPPED-END OF PRESTRESSED CONCRETE GIRDER IN DECHATIWONG BRIDGE USING FINITE ELEMENT ANALYSIS

Author(s): Nuttapong Kongwang (1), Tidarut Jirawattanasomkul (1), Wanakorn Prayoonwet (2), Songpol Charuvisit (1)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 621-626
Total Pages: 6
Language : English

Abstract: End parts of concrete bridge girders in Thailand are usually dapped-end connections, particularly in a suspended span of bridges. However, the diagonal cracks in the dapped-end zone were found in a 40-meter suspended span in Dechatiwong Bridge due to insufficient reinforcement in the dapped-end region compared to that in PCI Design 2010. Hence, the aim
of this research is to analyze the influence of different dapped reinforcement and effect of the tendon in the nib portion of the dapped-end on the failure modes and strength of dapped-end girders using 2D nonlinear finite element modeling in ATENA program. The result of nonlinear finite element analysis indicated that the hanger reinforcement is significant because it can change the failure mode from shear compression at the nib region to flexure shear in the
full-depth section, and the models with tendon in nib portion can significantly increase the structural strength compared to that without tendon in the nib portion model. It was also found that the strength of the dapped-end girder predicted by the PCI design agrees well with that of girders without prestressing in nib portion. Therefore, the design equations proposed by PCI is still reliable and accurate for the structure without prestressing in the nib portion.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00