Torsional behavior of multistory RC frame structures due to asymmetric seismic interaction

Karayannis, Chris G.; Naoum, Maria C.

doi:10.1016/j.engstruct.2018.02.038

Cited by 42 publications

(21 citation statements)

References 8 publications

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“…Для иллюстрации волновых эффектов сейсмических воздействий часто рассматривают малоразмерные модели конструкций (здания, опоры и пролеты мостов, вышки связи и т.д. ), для которых легко получить уравнения движения и параметры динамической реакции [5][6][7][8][9][10][11][12][13][14][15]. Расчеты на сейсмостойкость обычно проводят, принимая интегральную дилатационную модель сейсмического движения грунта, когда грунтовое основание совершает поступательное пространственное движение без угловых перемещений; примеры расчетов для небольших моделей с выводом уравнений движения и их решением можно найти в работах [5][6][7][8][9][10][11][12]14].…”

Section: обзор литературыunclassified

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About Boundary Conditions in Earthquake Engineering Analyses for Differential Seismic Ground Motion

Poznyak¹

2018

Stroitel’stvo: nauka i obrazovanie

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А ННОТА Ц И Я: Предмет исследования: представлен анализ динамической реакции плоской модели двухэтажного здания при распространении поверхностных волн Рэлея. При расчетах применялась дифференцированная модель сейсмического движения грунта, когда сейсмическое воздействие передается на конструкцию в виде кинематического возбуждения грунта в опорных точках. Были рассмотрены шесть вариантов грунтовых условий с различными длинами доминирующих сейсмических волн и три способа задания граничных условий. Цели: получение уравнений движения плоской сдвигово-поворотной модели здания для дифференцированного сейсмического воздействия; проведение оценки влияния различных компонент сейсмического воздействия на динамическую реакцию конструкции; предложение способов упрощений кинематических граничных условий, в общем случае включающих поступательные и ротационные перемещения грунтового основания в точках опирания. Материалы и методы: численное моделирование динамической реакции модели здания во временной области при различных вариантах воздействий и граничных условий. Результаты: получено решение во временной области для трех моделей, различие между которыми заключается в задании движения основания в каждой опорной точке: 1) два поступательных и одно угловое перемещение (точные граничные условия); 2) два поступательных перемещения; 3) два поступательных перемещения и одно угловое, рассчитанное по взаимным поступательным перемещениям. Выводы: сравнение результатов, полученных при упрощении граничных условий 2) и 3), с точным решением 1), показало, что для обычных грунтовых условий локальными ротационными компонентами дифференцированного сейсмического движения можно пренебречь, рассматривая только пространственное поступательное движение опор.

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Section: обзор литературыunclassified

“…To illustrate the seismic wave effects, small models of structures (buildings, supports and spans of bridges, communication towers, etc.) are often considered; for these models, it is easy to obtain equations of motion and dynamic response parameters; see, for example, works [5][6][7][8][9][10][11][12][13][14][15].…”

Section: Reviewmentioning

confidence: 99%

About Boundary Conditions in Earthquake Engineering Analyses for Differential Seismic Ground Motion

Poznyak¹

2018

Stroitel’stvo: nauka i obrazovanie

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“…Although provisions prescribe proper separation distance to avoid collisions, some inherent factors make this separation distance not always effective. Eccentric contact forces due to pounding may lead to torsional movements, which can cause crucial damage in structures (Karayannis and Naoum 2018).…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of structural pounding on the seismic performance of adjacent RC and steel MRFs

Kazemi

Miari

Jankowski

2020

Bull Earthquake Eng

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An insufficient separation distance between adjacent buildings is the main reason for structural pounding during severe earthquakes. The lateral load resistance system, fundamental natural period, mass, and stiffness are important factors having the influence on collisions between two adjacent structures. In this study, 3-, 5- and 9-story adjacent reinforced concrete and steel moment resisting frames (MRFs) were considered to investigate the collision effects and to determine modification factors for new and already existing buildings. For this purpose, incremental dynamic analysis was used to assess the seismic limit state capacity of the structures using a developed algorithm in OpenSees software including two near-field record subsets suggested by FEMA-P695. The results of this paper can help engineers to approximately estimate the performance levels of MRFs due to pounding phenomenon. The results confirm that collisions can lead to the changes in performance levels, which are difficult to be considered during the design process. In addition, the results of the analyses illustrate that providing a fluid viscous damper between adjacent reinforced concrete and steel structures can be effective to eliminate the sudden changes in the lateral force during collision. This approach can be successfully used for retrofitting adjacent structures with insufficient in-between separation distances.

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“…Ghandil and Aldaikh [21] developed a series of SSSI models to accurately study the problem of SSSI-included pounding of two adjacent buildings. Karayannis and Naoum [22] investigated the influence of two adjacent structures with different stories, different layouts, and initial distance on torsion under earthquake. Furthermore, some more recent numerical analyses have been carried out to study the influence of different parameters in pounding of buildings [23,24].…”

Section: Introductionmentioning

confidence: 99%

Pounding between Adjacent Frame Structures under Earthquake Excitation Based on Transfer Matrix Method of Multibody Systems

Zhang

Ding

Zhuang

et al. 2019

Advances in Civil Engineering

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In this paper, the case of two adjacent frame structures is studied by establishing a mechanical model based on the transfer matrix method of multibody system (MS-TMM). e transfer matrices of the related elements and total transfer equation are deduced, combining with the Hertz-damp mode. e pounding process of two adjacent frame structures is calculated by compiling the relevant MATLAB program during severe ground motions. e results of the study indicate that the maximum error of the peak pounding forces and the peak displacements at the top of the frame structure obtained by the MS-TMM and ANSYS are 6.22% and 9.86%, respectively. Comparing the calculation time by ANSYS and MS-TMM, it shows that the computation efficiency increases obviously by using the MS-TMM. e pounding mainly occurs at the top of the short structure; meanwhile, multiple pounding at the same time may occur when the separation gap is small. e parametric investigation has led to the conclusion that the pounding force, the number of poundings, the moment of pounding, and the structural displacement are sensitive to the change of the seismic peak acceleration and the separation gap size.

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Torsional behavior of multistory RC frame structures due to asymmetric seismic interaction

Cited by 42 publications

References 8 publications

About Boundary Conditions in Earthquake Engineering Analyses for Differential Seismic Ground Motion

About Boundary Conditions in Earthquake Engineering Analyses for Differential Seismic Ground Motion

Investigating the effects of structural pounding on the seismic performance of adjacent RC and steel MRFs

Pounding between Adjacent Frame Structures under Earthquake Excitation Based on Transfer Matrix Method of Multibody Systems

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