مقايسه تغييرات پاسخ ناشي از راستاي اعمال مولفه هاي متعامد افقي شتاب نگاشت زلزله

COMPARISON OF THE VARIATION OF RESPONSE DUE TO THE VARIATION ANGLE OF HORIZONTAL ORTHOGONAL ACCELEROGRAM COMPONENTS

In structural elements, with the variation angle of hori¬zontal orthogonal accelerogram components, the response to the relation between the principal axes of the building will vary. In this paper, a steel building that is regular in plan and height, using seven acceleration records, is analyzed by nonlinear dynamic analysis and the criti¬cal angle and relation variation responses are calculated. Results indicated the critical angle is different with vary¬ing acceleration records. In this study, the increase in the intensity ground motion and nonlinear behavior in the structural elements is also investigated. Results indi¬cated that critical angle and increase relation responses vary with an increase in the intensity ground motion.