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An improved multidimensional MPA procedure for bidirectional earthquake excitations.

Feng Wang1, Jian-Gang Sun1, Ning Zhang2

  • 1College of Architecture & Civil Engineering, Dalian Nationalities University, Dalian 116600, China.

Thescientificworldjournal
|August 21, 2014
PubMed
Summary

This study introduces an improved multidimensional modal pushover analysis (IMMPA) for estimating structural responses to bidirectional earthquakes. The IMMPA method enhances seismic demand estimation by directly superposing earthquake components, avoiding separate analyses.

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Area of Science:

  • Structural Engineering
  • Earthquake Engineering
  • Computational Mechanics

Background:

  • Traditional seismic analysis often simplifies earthquake excitations to unidirectional.
  • Multidimensional earthquake effects on structures require advanced analytical methods.
  • Existing methods may involve complex superposition or independent directional analyses.

Purpose of the Study:

  • To present an improved multidimensional modal pushover analysis (IMMPA) method.
  • To estimate seismic response demands for structures under bidirectional earthquake excitations.
  • To avoid independent directional analyses and simplified superposition formulas.

Main Methods:

  • Extending the modal pushover analysis procedure to multidimensional scenarios.
  • Replacing unidirectional excitation with direct superposition of bidirectional earthquake components.
  • Developing a step-by-step procedure for seismic demand estimation.

Main Results:

  • The IMMPA method accurately estimates structural responses to bidirectional earthquake excitations.
  • Structural response deviation increases with higher peak earthquake accelerations.
  • Response deviation also increases with the number of stories in the structure.

Conclusions:

  • The IMMPA method is a viable tool for analyzing structures under multidimensional seismic loads.
  • The study highlights factors influencing response deviation in seismic analysis.
  • The proposed method offers a more integrated approach to bidirectional earthquake analysis.