Effects of vertical excitation on seismic performance of highway bridges and hold-down device requirements

Download

index.pdf

Date

2008

Author

Domaniç, Kemal Arman

Metadata

Show full item record

Item Usage Stats

249
views

113
downloads

Most bridge specifications ignore the contribution of vertical motion in earthquake analyses. However, vertical excitation can develop significant damage, especially at bearing locations as indeed was the case in the recent 1999 İzmit Earthquake. These observations, combined with recent developments in the same direction, supplied the motivation to investigate the effects of vertical component of strong ground motion on standard highway bridges in this study. Reliability checks of hold-down device requirements per AASHTO Bridge Specifications have been conducted in this context. Six spectrum compatible accelerograms were generated and time history analyses were performed to observe the uplift at bearings. Selected case studies included precast pre-stressed I-girders with concrete slab, composite steel I-girders, post-tensioned concrete box section, and composite double steel box section. According to AASHTO specifications, hold-down devices were required in two cases, for which actual forces obtained from time history analyses have been compared with those suggested per AASHTO. The only non-linearity introduced to the analyses was at the bearing level. A discussion of effects on substructure response as well as compressive bearing forces resulting from vertical excitation is also included. The results of the study confirmed that the provisions of AASHTO governing hold-down devices are essential and reasonably accurate. On the other hand, they might be interpreted as well to be suggesting that vertical ground motion components could also be included in the load combinations supplied by AASHTO, especially to be able to estimate pier axial forces and cap beam moments accurately under combined vertical and horizontal excitations.

Subject Keywords

Bridge engineering., Civil engineering.

URI

http://etd.lib.metu.edu.tr/upload/12609297/index.pdf
https://hdl.handle.net/11511/17536

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effect of dynamic soil-bridge interaction modeling assumptions on the calculated seismic response of integral bridges Erhan, Semih; Dicleli, Murat (2014-11-01) In this study, the effect of soil-structure modeling assumptions and simplifications on the seismic analyses results of integral bridges (lBs) is investigated. For this purpose, five structural models of lBs are built in decreasing levels of complexity starting from a nonlinear structural model including close numerical simulation of the behavior of the foundation and backfill soil and gradually simplifying the model to a level where the effect of backfill and foundation soil is totally excluded. Nonlinear ...
Effect of soil-bridge interaction on the magnitude of internal forces in integral abutment bridge components due to live load effects Dicleli, Murat (Elsevier BV, 2010-01-01) In this study, the effect of soil-bridge interaction on the magnitude of the internal forces in integral abutment bridge (IAB) components due to live load effects is studied. For this purpose, structural models of typical IABs are built by including and excluding the effect of backfill and foundation soil. Analyses of the models are then conducted under an AASHTO live load. In the analyses, the effects of the backfill and foundation soil on the magnitude of the internal forces in IAB components are studied ...
Effect of shear walls on the behavior of reinforced concrete buildings under earthquake loading Çömlekoğlu, Hakkı Gürhan; Burak Bakır, Burcu; Department of Civil Engineering (2009) An analytical study was performed to evaluate the effect of shear wall ratio on the dynamic behavior of mid-rise reinforced concrete structures. The primary aim of this study is to examine the influence of shear wall area to floor area ratio on the dynamic performance of a building. Besides, the effect of shear wall configuration and area of existing columns on the seismic performance of the buildings were also investigated. For this purpose, twenty four mid-rise building models that have five and eight sto...
Vertical ground motion influence on seismically isolated & unisolated bridges Rehanoğulları, Naim Eser; Akyüz, Uğurhan; Department of Civil Engineering (2010) In this study influences of vertical ground motion on seismically isolated bridges were investigated for seven different earthquake data. One assessment of bearing effect involves the calculation of vertical earthquake load on the seismically isolated bridges. This paper investigates the influence of vertical earthquake excitation on the response of briefly steel girder composite bridges (SCB) with and without seismic isolation through specifically selected earthquakes. In detail, the bridge is composed of ...
Improving ductility and shear capacity of reinforced concrete columns with carbon fiber reinforced polymer Özcan, Okan; Özcebe, Güney; Department of Civil Engineering (2009) The performance of reinforced concrete (RC) columns during recent earthquakes has clearly demonstrated the possible failures associated with inadequate confining reinforcement. The confinement reinforcement requirements of older codes were less stringent than present standards. Many studies were conducted by applying different retrofitting techniques for RC columns that have inadequate confinement reinforcement. A new retrofitting technique by means of Carbon Fiber Reinforced Polymer (CFRP) was developed an...

Citation Formats

K. A. Domaniç, “Effects of vertical excitation on seismic performance of highway bridges and hold-down device requirements,” M.S. - Master of Science, Middle East Technical University, 2008.