نتایج جستجو برای: Dynamic Nonlinear Analysis

تعداد نتایج: 3286537  

Journal: :civil engineering infrastructures journal 0
seyed mehdi zahrai associate professor, center of excellence for engineering and management of civil infrastructures, school of civil engineering, college of engineering, university of tehran, p.o.box: 11155-4563, tehran, iran. alireza ezoddin ph.d. student, faculty of civil engineering, university of semnan, semnan, iran.

progressive collapse is a chain reaction of failures propagating throughout a portion of the structure disproportionate to the original local failure occurring when a sudden loss of a critical load‐bearing element initiates a structural element failure, eventually resulting in partial or full collapse of the structure. both general services administration (gsa) and united states department of d...

Journal: :international journal of civil engineering 0
f.r. rofooei civil engineering department, sharif university of technology, tehran, iran, m. r. mirjalili doctoral student, structural engineering, civil engineering department, sharif university of technology, tehran, iran n. k. a. attari department of structural engineering, building and housing research center (bhrc), tehran, iran

the nonlinear static procedures (nsps) proposed by design codes do not lead to reliable results especially for tall buildings. they generally provide inconsistent estimates of inelastic seismic demands, especially for the top floors due to their inabilities in considering the higher modes effects. in this paper, a new enhanced pushover procedure is proposed which is based on the envelope of the...

Journal: :international journal of civil engineering 0
m. mahmoudi shahid rajaee teacher training university t. teimoori shahid rajaee teacher training university h. kozani shahid rajaee teacher training university

the current building codes provide limited prescriptive guidance on design for protection of buildings due to progressive collapse. progressive collapse is a situation in which a localized failure in a structure, caused by an abnormal load, such as explosions or other happenings. three procedures, often employed for determination of the structural response during progressive collapse i.e. linea...

Journal: :journal of the structural engineering and geotechnics 0
araliya mosleh department of civil eng., faculty of engineering, university of aveiro, 3810-193 aveiro, portugal. hamed hamidi department of civil eng., babol noshirvani university of technology, iran ahmad nicknamc department of civil eng., iran university of science&technology, p.o. box 16765-163, tehran, iran josé jara department of civil eng., faculty of engineering, universidad michoacana de san nicolas de hidalgo, morelia, mexico humberto varume construct-lese, department of civil eng., faculty of engineering, university of porto, 4200-465 porto, portugal

bridges, as an essential part of transportation system, play a special role in economy, politic and military all around the world. serviceability of bridges is of high importance especially in emergencies, helping injured people and proportioning transportation after earthquakes. earthquake regulation codes, normally suggest linear methods to conduct the analysis, and nonlinear analysis is bare...

Journal: :civil engineering infrastructures journal 0
seyed bahram beheshti-aval associate professor, civil engineering faculty, k.n. toosi university of technology, tehran, iran ehsan jahanfekr ph.d. candidate, faculty of technical and engineering, hormozgan university, bandarabas, iran

displacement coefficient method (dcm) stipulated in the asce 41-06 standard is becoming the preferred method for seismic rehabilitation of buildings in many high-seismic-hazard countries. applications of the method for non-building constructions such as bridges are beyond the scope of this standard. thus its application to this kind of structure should be approached with care. target displaceme...

پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده علوم پایه 1390

بررسی وجود و چندگانگی جوابهای معادلات دیفرانسیل به ویژه با شرایط مرزی اغلب بسی دشوار بوده و همراه با گام های ملالت آور می باشد بطوریکه همواره نیاز به پیش شرط هایی می باشد که معادلات دیفرانسیل با شرایط مرزی مورد نظر باید داشته باشد. بنابراین اثبات آنالیزی وجود و چندگانگی جوابهای مسائل مقدار مرزی غیر خطی اغلب غیر ممکن می باشد. روشهای تقریبی- تحلیلی یا روشهای عددی صرفاً برای بدست آوردن جواب موجود ...

Journal: :civil engineering infrastructures journal 0
hamidreza tavakoli assistant professor, department of earthquake engineering, babol university of technology, babol, iran foad kiakojouri m.sc. of structural engineering, department of structural engineering, islamic azad university, takestan branch, iran

progressive collapse is defined as the spread of an initial failure from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. the current progressive collapse analyses and design methods in guidelines and codes focus on the alternate load path method. this method is suitable especially in the case of blast-induced progressive ...

Journal: :journal of rehabilitation in civil engineering 2014
hamed arshadi ramezan ali izadifard homayun estekanchi

endurance time (et) method is a relatively new performance-based earthquake method for structural evaluation and design. in this method, the structure is subjected to a gradually intensifying accelorogram(s) and its performance is assessed based on the maximum time duration that it can meet the specified performance objectives. using moment-resisting and braced frames which are rehabilitated by...

Journal: :international journal of maritime technology 0
behrouz asgarian no. 1346, valiasr st., mirdamad intersection 19967, p.o.box. 15875-4416, tehran, iran m boroumand no. 1346, valiasr st., mirdamad intersection 19967, p.o.box. 15875-4416, tehran, iran mohamad zarrin no. 1346, valiasr st., mirdamad intersection 19967, p.o.box. 15875-4416, tehran, iran

in this paper, pile behavior embedded in layered soil deposits subjected to seismic loadings is analyzed using a nonlinear fiber element for simulation of soil – pile interactions. in the created model, both pile and surrounding soil are modeled using fiber elements in a practical beam on nonlinear winkler foundation (bnwf) concept. herein, the features of drain–3dx finite element software are ...

Journal: :نشریه دانشکده فنی 0
ایرج محمود زاده کنی سیروس نصیرایی سهیل محمدی

in this paper we have discussed the main features of a finite clement program which we have developed for nonlinear dynamic analysis of plates and shells with material and geometric nonlinear behaviour. for this purpose, initially, the finite element model which we have used is briefly described. afterwards, the nonlinear viscoplastic material model in one-dimensional and multi-dimensional medi...

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