scholarly journals The Effect of slit-friction hybrid damper on the Performance of Dual System

2019 ◽  
Vol 13 (1) ◽  
pp. 271-280
Author(s):  
Azadeh Khoshkroodi ◽  
Hossein Parvini Sani
Keyword(s):  
Time History ◽  
Steel Structures ◽  
Repair Cost ◽  
Friction Dampers ◽  
History Analysis ◽  
Different Types ◽  
Moment Resisting ◽  
Hybrid Damper ◽  
Large Earthquakes ◽  
Different Levels

Aims: The aim of the present paper is to evaluate the behavior of slit friction hybrid dampers (SFHD) on steel structures. Therefore, the behavior moment resisting steel frames of structures in original stats and structures equipped with hybrid damper with two different types of behavior was analyzed and evaluated. Background: The recent study evaluated the combined effect of shear-friction dampers and slit dampers with measurements of non-uniform strips in seismic protection for different levels of energy. The recent study was carried out a about hybrid dampers, consisting of friction and split dampers in response to small and large earthquakes. Previous results have shown the ability of inactive hybrid systems in improving the reaction of structures to traditional lateral-systems. Kim and Shin showed that structures consisted of hybrid dampers needed less repair cost and time. Methods: Pushover and time history were carried out on original structures and structures equipped with dampers, in 5 and 10 stories structures. Results: Analysis about the probability of collapse showed about 30% and 84%. Conclusion: According to the result, by adding the SFHD, increased stiffness by 17% in retrofitted structures such as drift and displacement of roof decreases by 27% and 20% in push over analysis, respectively. Also, displacement in time history analysis up to 55% reduces in average. Also, the results of the IDA show that adding the SFHD to structures significantly increases by 55% the spectral acceleration capacity in structures.

scholarly journals Comparison of Scaling Ground Motions Using Arithmetic with Logarithm Values for Spectral Matching Procedure

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Rui Zhang ◽  
Dong-sheng Wang ◽  
Xiao-yu Chen ◽  
Hong-nan Li
Keyword(s):  
Ground Motions ◽  
Time History ◽  
Response Spectra ◽  
Time History Analysis ◽  
Spectral Matching ◽  
Moment Resisting Frame ◽  
History Analysis ◽  
Moment Resisting ◽  
Structural Responses ◽  
Structural Time

In recent studies, spectral matching is the most commonly proposed method for selecting earthquake records for time-history analysis of structures. However, until now, there have been no serious investigations of the effects of coordinate values on the scaling of ground motions. This paper investigated the influence of using arithmetic and logarithmic values of response spectra in spectral matching procedures (i.e., ASM and LSM methods) on the results of nonlinear structural time-history analysis. Steel moment resisting frame structures of the 3-, 9-, and 20-stories, which represent low-, medium-, and high-rise buildings, respectively, were used as examples. Structural benchmark responses were determined by calculating the arithmetic mean and median of peak interstory drift ratio (PIDR) demands based on the three record sets developed by the American SAC Steel Project. The three record sets represent seismic hazard levels with 50%, 10%, and 2% probabilities exceeded in 50 years, and their average acceleration spectra were also taken as the target spectrum. Moreover, another 40 record components for selection were scaled both by ASM and LSM methods. The seven components whose spectra were best compatible with the target spectra were selected for the structural time-history analysis. The scale factors obtained by the LSM method are nearly larger than that of the ASM method, and their ranking and selection of records are different. The estimation accuracies of structural mean (median) responses by both methods can be controlled within an engineering acceptable range (±20%), but the LSM method may cause larger structural responses than the ASM method. The LSM method has a better capacity for reducing the variability of structural responses than the ASM method, and this advantage is more significant for longer-period structures (e.g., 20-story structure) with more severe nonlinear responses.

Influence of Non-Linear Properties of Fluid Viscoelastic Properties on Seismic Damping Properties of a Ten Stories Building Using ANSYS Program

2014 ◽  
Vol 658 ◽  
pp. 245-248 ◽  
Author(s):  
Adriana Ionescu ◽  
Mihai Negru ◽  
Cristian Burada
Keyword(s):  
Viscoelastic Fluid ◽  
Time History ◽  
Seismic Energy ◽  
Nonlinear Damping ◽  
Damping Properties ◽  
Damping Property ◽  
History Analysis ◽  
Different Types ◽  
Nonlinear Features ◽  
Fluid Dampers

This paper presents the simulation of the influence of viscoelastic fluid dampers, with nonlinear damping properties, on damping property of a ten stories building structure. The study was made using Finite Elements Method and ANSYS program, on a 3d F.E.M. model. In order to obtain the influence of different types of damping nonlinearities of the viscoelastic fluid dampers on the damping property of the entire structure, there were made different types of simulations using modal analysis and seismic time history analysis. The graphics obtained can be used for determining the nonlinear features of fluid dampers for achieving different degrees of seismic energy dissipation for the analyzed building.

scholarly journals Analisis Kinerja Bangunan Rangka Baja dengan Bresing Tahan Tekuk terhadap Beban Gempa

2021 ◽  
Vol 6 (2) ◽  
pp. 98
Author(s):  
Ilham Ilham
Keyword(s):  
Pushover Analysis ◽  
Time History ◽  
Steel Structures ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Structural Performance ◽  
History Analysis ◽  
Immediate Occupancy ◽  
Nonlinear Time History ◽  
Modal Pushover

ABSTRAKPenggunaan bresing tahan tekuk dapat menjadi solusi atas kebutuhan struktur tahan gempa di Indonesia. Disipasi energi pada elemen bresing tahan tekuk dilakukan melalui kinerja plastifikasi bagian inti bresing akibat beban tarik dan tekan. Penelitian ini berisi kajian kinerja dari bangunan rangka baja beraturan dengan bresing tahan tekuk (BRB) dengan variasi level ketinggian lantai yaitu 3 lantai, 8 lantai dan 15 lantai. Analisis struktur 3D dilakukan dengan dua prosedur analisis yaitu modal pushover dan nonlinear time history pada program ETABS. Hasil analisis menunjukkan bahwa pemilihan elemen BRB sangat mempengaruhi kinerja struktur, yang terlihat dari pola drift yang terjadi. Untuk struktur beraturan dengan berbagai ketinggian, tingkat kinerja struktur dengan BRB cukup baik, yaitu Immediate Occupancy (IO) akibat beban gempa rencana. Plastifikasi hanya terjadi pada BRB, dan kelelehan pada balok mulai terbentuk sampai mekanisme keruntuhan terjadi. Hasil modal pushover dengan nonlinear time history pada bangunan 15 lantai yang cukup mirip menunjukkan bahwa modal pushover dapat digunakan untuk memprediksi kinerja struktur BRB yang beraturan.Kata kunci: kinerja struktur, bresing tahan tekuk, immediate occupancy, modal pushover, nonlinear time history ABSTRACTBuckling restrained braces (BRB) can be an alternative solution for earthquake resistant steel structure in Indonesia. The energy dissipation for buckling restrained elements is conducted through yielding of the core due to tension or compression forces. This study presents an evaluation of the structural performance of steel structures with BRB varying in heights, 3-story, 8-story and 15-story. The 3D structural analysis was carried out with ETABS software using 2 methods, Modal Pushover and Nonlinear Time History. The results shows that the selection of BRB elements greatly affected the structural performance, showed by the drift pattern. For regular structures with variation in heights, structures with BRB behaved satisfactory under the design load with the performance level of Immediate Occupancy (IO). Yielding was limited to BRB members, and afterwards the yielding occurred on beams until collapse. The results of modal pushover and time history analysis for 15-story structure are similar, thus modal pushover can be used to predict the performance of regular structural system with BRB.Keywords: structural performance, buckling restrained brace, immediate occupancy, modal pushover analysis, nonlinear time history analysis

scholarly journals Behaviour of RC Moment Resisting Regular and Irregular Framed Structures Situated Near and Far to Fault Zone

2020 ◽  
pp. 25-36
Author(s):  
K. J. Harshitha ◽  
R. Sunil ◽  
Avinash Gornale
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Near Fault ◽  
Earthquake Records ◽  
Earthquake Motion ◽  
History Analysis ◽  
Earthquake Record ◽  
Moment Resisting ◽  
Far Fault

Near fault earthquake record are rich in high frequencies that effects structures for far fault earthquake record lower frequencies is not effects highly in structure. The objective of the study is to be investigating the effect of near-fault and far fault earthquake motion on the response of RC moment resisting regular and irregular structure considering Near and Far situated fault zones. Linear time history analysis G+10 building has carried out for two structures. The effects of Near and Far faults zones were evaluated for G+10 Two structure the ordinary moment resisting frame system was considered for two building as a lateral load-resisting system. For two building time, history analysis was performed under two example earthquake motion Uattarkashi (Almora and Bhatwari) magnitude 6.8 Mw. The peak acceleration v/s time response spectra of the two horizontal components of the two records for Near source earthquake records @ a distance 21.7 km Bhatwari and Far source earthquake records @ a distance 153.5 km of Almora records are taken in virtual data centre of India earthquake records COSMOS Virtual Data Center - Strong Motion Center. For two building and earthquake record, the analysis was carried out for both conditions and compared with fixed base results for all analysis both Near-field and Far-field earthquake were considered. The mainly evaluated parameter were storey drift, storey displacement and storey force, period vibration results based on linear time history analysis considering two structures. The comparative study of four parameters considers the graphs and curves shows higher and lower values higher values show that the earthquake effect of building and damages is more.

scholarly journals EVALUASI JARAK AMAN ANTARA STRUKTUR SRPM TINGGI DENGAN STRUKTUR SRPM DISEBELAHNYA TERHADAP GEMPA

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Ade Faisal ◽  
Tondi Amirsyah Putera ◽  
Mariden Purba
Keyword(s):  
Time History ◽  
Tall Buildings ◽  
Soil Conditions ◽  
Safe Distance ◽  
High Rise ◽  
Moment Resisting Frame ◽  
History Analysis ◽  
Moment Resisting ◽  
Dynamic Time ◽  
Storey Building

Pembangunan gedung-gedung tinggi menjadi salah satu alternatif yang di pilih karena keterbatasan dan mahalnya lahan diperkotaan sementara tingkat permintaan ruang untuk berbagai kegiatan semakin tinggi. Hal ini menyebabkan gedung-gedung bertingkat sering dibangun saling berdekatan satu dengan yang lainnya. Benturan dapat terjadi pada dua bangunan gedung bertingkat yang bersebelahan apabila jarak antara dua bangunan lebih kecil dari simpangan maksimum yang terjadi akibat beban gempa. Studi ini bertujuan untuk mencari jarak aman antara dua bangunan tinggi yang bersebelahan. Gedung yang direncanakan 2 model menggunakan SRPM dengan material beton bertulang yang terletak di kota Medan dengan kondisi tanah sedang. Model  pertama (Model 1) direncanakan memiliki tinggi 28,5 meter terdiri dari 8 lantai, sedangkan Model kedua (Model 2) direncanakan memiliki tinggi 35,5 meter terdiri dari 10 lantai. Analisa yang digunakan pada studi ini yaitu analisis dinamik riwayat waktu. Nilai simpangan yang terjadi pada gedung  8 lantai (Model 1) untuk arah x sebesar 80,87 mm dan untuk arah y sebesar 79,35 mm. Simpangan yang  terjadi pada gedung 10 lantai (Model 2) untuk arah x sebesar 113,33 mm dan untuk arah y sebesar 112,39 mm. Hasil analisa yang dilakukan menunjukkan jarak aman antara gedung 8 lantai dengan gedung 10 lantai adalah sebesar 2,1 meter, sedangkan jarak aman antara gedung 10 lantai dengan gedung 10 lantai adalah sebesar 2,2 meter.  Kata Kunci : Analisis Riwayat Waktu, Benturan Antar Gedung, Jarak Antar Gedung, Simpangan  ABSTRACT The construction of tall buildings became one of alternative that was chosen because of the urban land limitations and the cost. At the same time the space demand for various urban activities is increased. It is caused the high-rise buildings are often built very close to one another. The collision can be occurred if two adjacent building if the distance between the two building is smaller than the maximum drift caused by the earthquake action. This study aims to plan a safe distance between two adjacent high-rise buildings. The planned building two models using Moment Resisting Frame with reinforced concrete material that is located in the city Medan with moderate soil conditions. The first model (Model 1) has a height of 28.5 meters is planned consists of 8 floors, while the second model (Model 2) planned to have a height of 35.5 meters consists of 10 floors. The analysis used in this study is the analysis of dynamic time history. The displacement value which occurred on 8 storey building (Model 1) to the x direction by 80.87 mm and for the y direction by 79.35 mm. The displacement occurs in the building 10 floors (Model 2) to the x direction of 113.33 mm and for the y direction of 112.39 mm. The results of analysis indicate that the safe distance between 8 storey building with 10 floors of the building is 2.1 meters, while the safe distance between buildings 10 floors with 10 storey building is 2.2 meters. Keywords: Time History Analysis, Clash Between Buildings, Distance Between Buildings, Deviation

scholarly journals Life-cycle cost evaluation of steel structures retrofitted with steel slit damper and shape memory alloy–based hybrid damper

2018 ◽  
Vol 22 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Mohamed NourEldin ◽  
Asad Naeem ◽  
Jinkoo Kim
Keyword(s):  
Life Cycle ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Life Cycle Cost ◽  
Time History ◽  
Steel Structures ◽  
Cost Evaluation ◽  
Nonlinear Time History Analysis ◽  
Analysis Model ◽  
Hybrid Damper

In this study, the seismic capacity of a hybrid damper, composed of a steel slit plate damper and two shape memory alloy bars, is investigated through fragility analysis and life-cycle cost evaluation of a steel frame retrofitted with the damper. The nonlinear time history analysis model frames show that the seismic responses of the frames equipped with hybrid damper are significantly lesser than the frames retrofitted with conventional slit dampers. The enhancement in the seismic performance of frames retrofitted with hybrid damper is because of extra stiffness, energy dissipation, and self-centering capability provided by the shape memory alloy bars. It is also observed that the life-cycle cost of the frames equipped with hybrid dampers is smallest compared with the life-cycle cost of the bare frames and the frames equipped with slit dampers, even though the initial cost is of the hybrid damper is higher than that of the conventional slit damper.

Seismic Performance of the Masonry Buildings with Frame at the Bottom Equipped with the New Hybrid Damper

2015 ◽  
Vol 744-746 ◽  
pp. 905-910
Author(s):  
Xiang Hong Sun ◽  
Xu Dong Liu ◽  
Yan Jun Fan ◽  
Shuang Jie Ding
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Seismic Performance ◽  
Time History ◽  
Simulation Method ◽  
Hysteretic Behavior ◽  
Masonry Buildings ◽  
Control Effect ◽  
History Analysis ◽  
Hybrid Damper

An improved new damper was presented. The mechanical properties of the damper were conducted by the numerical simulation method under the cyclic loading. Also, the seismic mitigation effectiveness of the damper was verified though Time History Analysis. The results show that the improved damper has good hysteretic behavior. It can significantly reduce structural displacement response. Furthermore, the seismic performance of Masonry Buildings with Frame at the Bottom was studied by equipped the improved damper. The control effect was compared with Masonry Buildings with Frame at the Bottom and Masonry Buildings with Two-story Frame at the Bottom.

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