Probabilistic Capacity Models and Fragility Estimates for Steel Pedestals Used to Elevate Bridges

Bisadi, Vahid; Gardoni, Paolo; Head, Monique

doi:doi:10.1061/(ASCE)ST.1943-541X.0000404

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Probabilistic Capacity Models and Fragility Estimates for Steel Pedestals Used to Elevate Bridges

J. Struct. Eng. 137, 1583 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000404 (10 pages)

Vahid Bisadi, S.M.ASCE¹, Paolo Gardoni, M.ASCE², and Monique Head, A.M.ASCE³

¹Graduate Assistant Researcher, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136 (corresponding author). E-mail: vahid_bisadi@tamu.edu
²Associate Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136. E-mail: pgardoni@civil.tamu.edu
³Assistant Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136. E-mail: mhite@civil.tamu.edu

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(Submitted 30 September 2009; accepted 17 February 2011; posted ahead of print 19 February 2011)

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Abstract

References (23)

Article Objects (13)

Using steel pedestals has become an effective method for elevating simply supported bridges in the United States. However, a method is needed to estimate their lateral load capacity and probability of failure subjected to different levels of applied loads. This paper shows the development of probabilistic models for the lateral load capacity of steel pedestals. The capacity models consider the prevailing uncertainties, including statistical uncertainty and model errors due to inaccuracy in the model form or missing variables. The proposed capacity models are used to estimate the conditional failure probability (or fragility) of an example steel pedestal for given sets of lateral and vertical loads. Because of the discontinuity in the limit state function, Monte Carlo simulation is used to estimate the fragility. Results show that for the studied steel pedestal, increasing vertical load decreases the probability of failure subjected to lateral loads. To investigate the effect of different random variables on the results, a sensitivity analysis is also conducted for the example steel pedestal.

Article Outline

Introduction
Probabilistic Capacity Model of Steel Pedestals Subjected to Lateral Loads
1. Anchor Capacity
  1. Anchor Bolt Failure Modes in Tension
2. Steel Rupture
3. Concrete Cone Breakout
4. Pullout
5. Splitting Failure
  1. Anchor Bolt Failure Modes in Shear
6. Steel Failure
7. Concrete Edge Failure
8. Concrete Pry-Out
  1. Shear-Tension Interaction
9. Base-Plate Yielding
Lateral-Vertical Load Interaction Curves for Steel Pedestals
Probability of Failure versus Lateral and Vertical Loads
Probability of Failure for an Example Steel Pedestal
1. Sensitivity Analysis for the Example Steel Pedestal
Summary and Conclusions

KEYWORDS

ASCE SUBJECT HEADINGS

Bridges, Steel, Probability, Estimation, Lateral loads

AUTHOR KEYWORDS

Bridges, Capacity, Probability, Estimation

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ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000404

PUBLICATION DATA

ISSN

0733-9445 (print)

1943-541X (online)

Publisher

American Society of Civil Engineers

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