en THEORETICAL AND EXPERIMENTAL DAMAGE DETECTION METHOD OF STRUCTURES USING STATIC DISPLACEMENTS Research Paper Research Paper In this paper a structural damage detection algorithm using static test data is presented. Damage is considered as a reduction in the structural stiffness (Axial and/or Flexural) parameters. Change in the static displacement of a structure is characterized as a set of non-linear undetermined simultaneous equations that relates the changes in static response of the structure to the location and severity of damage. An optimality criterion is introduced to solve these equations by minimizing the difference between the load vector of damaged and undamaged structures. The overall formulation leads to a non-linear optimization problem with non-linear equality and linear inequality constraints. A method based on stored strain energy in elements is presented to select the loading location. Measurement locations are selected based on Fisher Information Matrix. Numerical and experimental results of a 2D frame represent good ability of this method in detecting damages in a given structure with presence of noise in measurements. Damage, Static, Strain Energy, Optimization 112 122 http://ijce.iust.ac.ir/browse.php?a_code=A-10-145-3&slc_lang=en&sid=1 BAKHTIARI NEJAD F. 180031947532846002006 180031947532846002006 Yes RAHAI A. 180031947532846002007 180031947532846002007 No ESFANDIARI A. 180031947532846002008 180031947532846002008 No