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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2014, Vol. 8 Issue (4) : 388-398    https://doi.org/10.1007/s11709-014-0264-8
RESEARCH ARTICLE
Factors affecting the seismic behavior of segmental precast bridge columns
Haitham DAWOOD1,Mohamed ELGAWADY2,*(),Joshua HEWES3
1. Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0002, USA
2. Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla MO 65409, USA
3. Department of Civil and Environmental Engineering, Northern Arizona University, Flagstaff AZ 86011, USA
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Abstract

This manuscript discusses the design parameters that potentially affect the lateral seismic response of segmental precast post-tensioned bridge piers. The piers consist of precast circular cross section segments stacked one on top of the other with concentric tendons passing through ducts made in the segments during casting. The bottommost segments of the piers were encased in steel tubes to enhance ductility and minimize damage. An FE model was used to investigate different design parameters and how they influence the lateral force – displacement response of the piers. Design parameters investigated included the initial post-tensioning stress as a percentage of the tendon yield stress, the applied axial stresses on concrete due to post-tensioning, pier aspect ratios, construction details, steel tube thicknesses, and internal mild steel rebar added as energy dissipaters. Based on the data presented, an initial tendon stress in the range of 40%-60% of its yield stress and initial axial stress on concrete of approximately 20% of the concrete’s characteristic strength is appropriate for most typical designs. These design values will prevent tendon yielding until lateral drift angle reaches approximately 4.5%. Changing the steel tube thickness, height, or a combination of both proved to be an effective parameter that may be used to reach a target performance level at a specific seismic zone.

Keywords finite element analysis      concrete      precast units      bridges     
Corresponding Author(s): Mohamed ELGAWADY   
Online First Date: 22 September 2014    Issue Date: 12 January 2015
 Cite this article:   
Haitham DAWOOD,Mohamed ELGAWADY,Joshua HEWES. Factors affecting the seismic behavior of segmental precast bridge columns[J]. Front. Struct. Civ. Eng., 2014, 8(4): 388-398.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0264-8
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I4/388
Fig.1  Detailed dimensions for (a) standard pier and (b) pier B
Fig.2  A typical mesh and applied loads and displacements for the SPPT pier.
series parameter 1 2 3 4 5 6 7 8
PT initial stress level as a percentage of tendon’s yield stress (%). 30 40 45 50 60 70 80 90
IS stress on concrete induced by post-tensioning as a percentage of fc (%) 13 16 19% 22 25 28 31
AR aspect ratio of the piers. 3.0 4.5 6.0 7.5 9.0
CON different configurations of the system see Fig. 14
CTh confinement thickness (mm) 6.0 4.5 3.0 1.5
IED reinforcement ratio of the mild steel used as internal energy dissipaters (%) 0.00 0.25 0.44 1.34 1.75
Tab.1  Different values assigned to each design parameter in the study
Fig.3  The effects of changing the initial post-tensioning stress in the tendons while keeping the same stress on concrete
Fig.4  Drifts of different pier vs. the stresses in the post-tensioning tendons normalized by its yield stress
Fig.5  The effects of changing the initial post-tensioning stress in the tendons for squat piers
Fig.6  Drift of squat piers vs. the stresses in the post-tensioning tendons normalized by their yield stress
Fig.7  The effects of increasing the axial stresses due to post-tensioning forces on concrete segments
Fig.8  The increase in the post-tensioning stresses vs. the standard piers lateral drifts
Fig.9  The effects of increasing the axial stresses on concrete segments for Pier B
Fig.10  The increase in the post-tensioning stresses vs. piers type B lateral drifts
Fig.11  Layout of the piers having different aspect ratios
Fig.12  The effect of changing the piers’ aspect ratio on the backbone curves
Fig.13  The mechanism of deformation for slender and squat piers
Fig.14  Configuration of each pier of CON series
Fig.15  The effects of the different configurations on the backbone curves
Fig.16  The effects on the backbone curves of the different confinement thicknesses for (a) the lower segment only, and (b) the lower two segments
Fig.17  The effects of the IED on the backbone curves
Fig.18  High tensile strain concentrations in the segments at the end of the internal energy dissipation bars. (a) The bars between the first segment and the base; (b) the bars between the first two segments
Fig.19  The effects of different IED rebar diameters on normalized stresses on the rebar
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