نوع مقاله : پژوهشی
نویسندگان
1 پژوهشکده ی مهندسی سازه، پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله
2 مهندسان مشاور پتروآسماری بین الملل
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
During many decades,maintenance and behavior evaluation of civil structures
are drastically become of more importance problem of urban planning. Many
researchers have tried to present various efficient and effective methods to
evaluate more reliable and much precisely structural damages especially in the beginning of the damage formation. Among different proposed methods, model
updating method is truly known as an accurate and reliable method for detecting
location and severity of structural damages. Model updating method is a
properly substitution for the traditional methods. In this paper, a methodology
for model updating of complex andor irregular two degrees of freedom
moment-resisting steel structures and braced steel structures is presented. In
order to increase accuracy and performance of this methodology, model updating
is designed to carry out in two stages. Damages may be much dispersed and their
severities may be so small or much intense. This methodology is powered by an
iterative sensitivity analysis using nonlinear constraint optimization, which
is worked based on the Newton trust region algorithm. In order to shown
capability of the proposed methodology, different damaged steel frames are
examined. Model updating parameters are defined as stiffness reduction
coefficients of members or a member is divided into some smaller parts.
Updating is obtained during reducing differences between measured and
analytical modal parameters of the structure. These parameters may be the
values of frequencies and modal shapes of the real damaged structure and its
related analytical model. Extensive results obtained from analysis of different
models with various dispersed damages which were so small or very influenced in
severity, shown that the proposed methodology has able to detect three levels
of the structural health monitoring stages, accurately and more precisely.
These three levels are as follows: (1) detection that the considered structure
is healthy or damaged, (2) detection of damage locations (along whole or part
of the members of the considered structure), (3) detection of the severity of
the damaged member, which may be so small or so intense.
کلیدواژهها [English]
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