341.4R-16: Report on the Seismic Design of Bridge Columns Based on Drift

341.4R-16: Report on the Seismic Design of Bridge Columns Based on Drift

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Description

This report provides a basis for evaluating bridge column drift demands and bridge column performance under simulated earthquake loading. It is intended for practicing engineers and academic researchers. Seismic performance objectives established for bridges are reviewed with an emphasis on bridge column performance states. Examples of column damage in past earthquakes are reviewed. Results from recent research on column performance are adapted to the case of bridge columns having a practical range of transverse reinforcement. These results are summarized in terms of drift limits associated with different performance states as a function of column shear span-depth ratio and axial load ratio, for both rectangular and circular section columns. A static pushover method is presented that accounts for embankment flexibility. A two-span bridge is used as an example to illustrate the evaluation of column performance, the influence of changing column bent configurations (two 5 ft [1500 mm] diameter columns versus three 4 ft [1200 mm] diameter columns), and that larger column drift demands may result when embankment mass and flexibility are modeled.

Keywords: abutment; bridge; column; drift limit, embankment flexibility; performance objective, seismic analysis; seismic evaluation; seismic performance.

 

Document Details

Author: ACI Committee 341

Publication Year: 2016

Pages: 70.00

ISBN: 9781945487026

Categories: Bridges

Formats: Printed Document, PDF, or Kindle

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE

1.1—Introduction

1.2—Scope

CHAPTER 2—NOTATION

CHAPTER 3—DESIGN OBJECTIVES AND APPROACHES

3.1—Performance-based design philosophy

3.2—Ductile mechanisms

3.3—Performance states and objectives

3.4—Earthquake ground motion

3.5—Methods of analysis

3.6—Design methods

CHAPTER 4—PERFORMANCE LIMITS FOR REINFORCED CONCRETE BRIDGE COLUMNS

4.1—Introduction

4.2—Field observations of bridge column performance

4.3—Laboratory observations of bridge column performance

4.4—Performance expectations

CHAPTER 5—CONSIDERATION OF EMBANKMENT FLEXIBILITY IN EVALUATION OF COLUMN DRIFT DEMANDS

5.1—Introduction

5.2—Structural modeling

5.3—Analysis procedures

5.4—Column design strengths

5.5—Column displacements

5.6—Evaluation of column displacement performance states

CHAPTER 6—DESIGN OF COLUMNS FOR PERFORMANCE AND CONSTRUCTABILITY

6.1—Introduction

6.3—Design of transverse reinforcement

6.4—Anchorage and splices of longitudinal reinforcement

6.5—Splices of hoop and spiral reinforcement

6.6—P-∆ effects

CHAPTER 7—EXAMPLES

7.1—Introduction

7.2—Example: evaluation of performance of rectangular section column

7.3—Evaluation of column performance in two-span bridge

7.4—Conclusions

CHAPTER 8—REFERENCES

Authored documents

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