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Seismic Simulation and Design of Bridge Columns under Combined Actions, and Implications on System Response. University of Illinois Contribution. Amr S. Elnashai Sung Jig Kim Curtis Holub Narutoshi Nakata Oh Sung Kwon. Research Focus. Existing methodologies. Analysis tools.

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University of Illinois Contribution


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university of illinois contribution

Seismic Simulation and Design of Bridge Columns

under Combined Actions, and Implications on System Response

University of Illinois Contribution

Amr S. Elnashai

Sung Jig Kim

Curtis Holub

Narutoshi Nakata

Oh Sung Kwon

research focus
Research Focus

Existing methodologies

Analysis tools

Bidirectional loading

Torsion

UIUC

Vertical Motion

Vertical Motion

  • Performance assessment of bridge system using PSD tests
  • Determination of the impact of varying vertical force on behavior of reinforced concrete bridge columns
    • Evaluation of the effect of shear-axial-flexure interaction
    • Consideration of soil-structure interaction
    • Investigation of the effect of early arrival of vertical motion on the periods of flexural vibrations under horizontal motion for RC bridge structures
    • Derivation of design guidance for reduced shear capacity in the presence of high vertical motion

NEES-R

Performance assessment of

the bridge columns under

complex loading

analysis and design
Analysis and Design
  • Analysis of a series of bridge structures subject to different levels of earthquake excitations
    • OpenSees, Zeus-NL- the MAE Center advanced analysis platform
    • This process will be conducted using UI-SIMCOR as a simulation coordinator
    • Analytical work will provide the modeling of PSD conditions to zoom on parameters resulting in high levels of simultaneous transverse and vertical accelerations.
  • Study the seismic response of the bridge systems, including foundations and surrounding soils
    • Appropriate multidirectional loading and boundary conditions for columns can be obtained
  • Determination of the appropriate input loading for the specimens tested in the subsequent phases of the project
experiment
Experiment

Test at UIUC

Large Scale Test

Small Scale Test

Test with UMR

NEES-R

  • MISST test (previous multi-site test at UIUC) will provide the test bed for the loading protocols
  • Tests of 3 large scale and 4 small scale bridge columns with different aspect ratios and seismic design details using MUST-SIM Facility
  • Column test with UMR under different loading conditions
    • Verify local and global analytical part of the hybrid simulation
    • Provide an opportunity for researchers outside of a NEES facility
    • Detailed design of UIUC and UNR experiments will be guided by bridge system analysis
parametric study for effect of vertical motion on bridge pier
Parametric Study for Effect of Vertical Motion on Bridge Pier

Start

Select Records

Ms >5.5, D <25 km

V/H > 0.6

Choose Model Structure

and Parameters

Parametric Study

Span length, ratio

and column height

Complex Structure

V/H ratio, Time Interval

Bridge

Dynamic Time History Analysis

Zeus-NL

Evaluate Resuts

Dx, Fy, Mz

and strains

Calculate Shear Demand

and Capacity

Estimate the effect of VGM

End

summary of parametric study
Summary of Parametric Study

VGM

HGM

Axial force variation

Increasing ratio of

V due to VGM

Axial force

  • Axial force is mainly affected by vertical ground motion
    • Especially, as span ratio increase, the effect of vertical seismic motion to axial force increase significantly only when vertical record is considered
  • Shear capacity is reduced by vertical ground motion
    • Span length is longer
    • Span ratio is close to 1
    • Column height is shorter
    • In case of seismic assessment for the structure with above geometric configurations, vertical ground motion should be considered
  • Future parameter study
    • Various connection type between deck and piers, Number of spans, Various deck stiffness, Type of abutment, Curved bridge
small scale testing
Small-Scale Testing
  • Current testing
    • Several 1/16 scaled piers are currently being tested
    • Used to evaluate system and material/pier design

Test Setup

After Test

multi site soil structure foundation interaction test misst pre neesr project
Multi-Site Soil-Structure-Foundation Interaction Test (MISST) – Pre-NEESR Project

Three Site Distributed Hybrid Bridge System

Test Setup - UIUC

After Test - UIUC