Nees sfsi demonstration project
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NEES SFSI Demonstration Project. Project Meeting – August 1, 2005 Austin, TX Matthew Dryden Prof. Gregory Fenves University of California, Berkeley. NEES SFSI Simulations – UCB Objectives. Develop component and system models for bridge-foundation system.

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NEES SFSI Demonstration Project

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Nees sfsi demonstration project

NEES SFSI Demonstration Project

Project Meeting – August 1, 2005

Austin, TX

Matthew Dryden

Prof. Gregory Fenves

University of California, Berkeley


Nees sfsi simulations ucb objectives

NEES SFSI Simulations – UCBObjectives

  • Develop component and system models for bridge-foundation system.

  • Calibrate models using experimental data:

    • Column tests: cyclic model for columns

    • Field tests: response of single bent including pile-soil interaction

    • Centrifuge tests: response of piles, bents, and system at small scale

    • Shake table tests: response of structural system at large scale

  • Synthesize prototype system model from calibrated models and conduct parameter study on different configurations and site conditions.

  • Simulation tasks are coordinated between Univ. Washington, UC Davis, and UC Berkeley with coordination of project investigators.


Analysis of shaking table tests

Bent 3

Bent 2

Bent 1

Analysis of Shaking Table Tests

  • Calibration of OpenSees structural model based on data from UNR shaking table tests


Simplified hinge model

Simplified Hinge Model


Simplified hinge model1

Simplified Hinge Model


Analysis of shaking table tests1

Analysis of Shaking Table Tests


Analysis of shaking table tests2

Analysis of Shaking Table Tests


Analysis of shaking table tests3

Analysis of Shaking Table Tests


Analysis of shaking table tests4

Analysis of Shaking Table Tests


Analysis of shaking table tests5

Analysis of Shaking Table Tests


Analysis of shaking table tests6

Analysis of Shaking Table Tests


Analysis of shaking table tests7

Analysis of Shaking Table Tests


Analysis of shaking table tests8

Analysis of Shaking Table Tests


Analysis of shaking table tests9

Analysis of Shaking Table Tests


Collaborative efforts with ucd

Collaborative Efforts with UCD

  • Collaboration between UCB and UCD on development of SFSI models using OpenSees


Selection of prototype systems

2-span or 4-span bridges.

Column heights based on dimensions of centrifuge tests.

Include a range of soil types to investigate the influence of site effects on the system response.

Selection of Prototype Systems


Selection of prototype systems1

Study the effect of variation in ground level on the response of bridges (differing motions at abutment level vs. at base of columns).

Determine the sensitivity of the response to various abutment models.

Selection of Prototype Systems


Prototype model

Prototype Model

  • Simulate the response of a long viaduct.

  • Excitation applied as displacement time histories determined from SHAKE analyses.


Site response analysis

Site Response Analysis


Global response effect of soil structure interaction

Global ResponseEffect of Soil Structure Interaction


Global response effect of soil structure interaction1

Global ResponseEffect of Soil Structure Interaction


Global response effect of soil structure interaction2

Global ResponseEffect of Soil Structure Interaction


Global response effect of bar slip model

Global ResponseEffect of Bar Slip Model


Global response effect of bar slip model1

Global ResponseEffect of Bar Slip Model


Global response effect of bar slip model2

Global ResponseEffect of Bar Slip Model


Local response

Local Response


Local response1

Local Response


Local response2

Local Response


Global response comparison with fixed base case

Global ResponseComparison with Fixed Base Case


Global response comparison with fixed base case1

Global ResponseComparison with Fixed Base Case


Global response comparison with fixed base case2

Global ResponseComparison with Fixed Base Case


Continuing work hierarchy of models

Continuing Work - Hierarchy of Models

  • Develop models at varying levels of sophistication to determine how much complexity is necessary to capture the response adequately.

  • OpenSees 3-D model of structure with p-y curves and displacement time histories determined from SHAKE analyses.

  • Collaborate with UCD to develop 3-D model of structure with 3-D solid elements for the soil.


Nees sfsi demonstration project

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