scholarly journals Effect of the Improved Pall Friction Damper on the Seismic Response of Steel Frames

2017 ◽  
Vol 7 (4) ◽  
pp. 1833-1837 ◽  
Author(s):  
P. H. Sarjou ◽  
N. Shabakhty
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Steel Frames ◽  
Time History ◽  
Friction Damper ◽  
Base Shear ◽  
Absorbed Energy ◽  
Steel Bracing ◽  
History Analysis ◽  
Energy Absorbing

Energy-absorbing dampers are used to reinforce structures which are vulnerable to earthquakes. This study evaluates the performance of Improved Pall Frictional Dampers (IPFD) which is a type of Pall Frictional Damper (PFD). For this purpose, this study compares the performances of steel frames with concentric steel bracing reinforced by IPFD and steel frames with concentric steel bracing with no damper. Frames with different stories and pans were modelled in sap2000 and exposed to accelerograms of earthquakes for non-linear time history analysis. Results of analysis were studied; parameters such as story displacement, base shear and absorbed energy were compared in steel frames with damper and without damper.

scholarly journals Evaluasi Geser Dasar Minimun pada SNI 1726-2012

2019 ◽  
Vol 10 (2) ◽  
pp. 166-184
Author(s):  
Johnny Setiawan ◽  
Iswandi Imran
Keyword(s):  
Linear Time ◽  
Damage Control ◽  
Time History ◽  
Time History Analysis ◽  
Performance Level ◽  
Life Safety ◽  
Base Shear ◽  
History Analysis ◽  
Story Drift ◽  
Immediate Occupancy

Terdapat cukup banyak perubahan pada SNI 1726-2012, salah satunya adalah adanya persyaratanbatas geser dasar minimum (minimum base shear) yang tidak ada pada peraturan sebelumnya.Metode yang akan dilakukan adalah bangunan gedung dengan klasifikasi ketinggian rendah,sedang dan tinggi akan dianalisis dengan menerapkan geser dasar minimum dan tanpa geser dasarminimum. Analisis yang akan digunakan adalah analisis ragam spektrum respons (ResponsSpectrum Analysis, RSA), analisis respons riwayat waktu (Time History Analysis, THA) dananalisis respons riwayat waktu non linier (Non Linear Time History Analysis, NLTHA). Hasilanalisis menunjukkan bahwa pada peraturan SNI 1726-2012 dengan adanya persyaratan batasangeser dasar minimum dapat menjamin kinerja struktur sesuai dengan yang diharapkan.Kekhawatiran adanya batasan geser dasar minimum pada SNI 1726-2012 akan membuat desainmenjadi tidak ekonomis, ternyata tidak terbukti karena tidak memberikan pengaruh signifikanpada hasil desain, khususnya untuk bangunan dengan kategori ketinggian rendah dan sedang.Untuk bangunan dengan klasifikasi bangunan tinggi, analisis dan desain dengan memperhitungansyarat batasan geser dasar minimum dan tanpa memperhitungkan geser dasar minimum dapatmemberikan hasil desain yang baik, tetapi pengecekan pada Level Kinerja (Performance Level)sesuai dengan story drift menunjukkan bahwa analisis dengan memperhitungkan syarat geser dasarminimum memberikan hasil dengan level kinerja yang cukup baik yaitu Immediate Occupancy(IO) hingga Damage Control (DO), sedangkan tanpa memperhitungkan geser dasar minimummemberikan hasil dengan level kinerja yang kurang baik yaitu Life Safety (LS) hingga StructuralStability (SS). Sedangkan pada level kinerja elemen struktur, analisis tanpa memperhitungkangeser dasar minimum menyebabkan banyak elemen struktur yang berada pada level kinerjaCollapse Prevention (CP).

scholarly journals Dynamic Analysis of Steel Silo

2020 ◽  
Vol 9 (1) ◽  
pp. 1986-1990
Keyword(s):  
Dynamic Analysis ◽  
Linear Time ◽  
Response Spectrum ◽  
Structural Response ◽  
Time History ◽  
Time History Analysis ◽  
Base Shear ◽  
Natural Period ◽  
History Analysis ◽  
Lateral Displacements

The structural response of any structure is the result of various dynamic phenomenon which lead to vibrations or shaking of the structure , depending on the duration of the ground motion, its frequency and time period. In the present work, dynamic analysis of a typical steel silo is done by using linear Time History Analysis and Response Spectrum method for earthquake Zone V as per Indian code. Two analyses are carried out namely, Time History Analysis (THA) and Response Spectrum Analysis (RSA) using STAAD.ProV8i software. The Load combinations are worked out as per IS-1893-2002. The results in terms of Fundamental natural period, Design Base shear, Lateral Displacements, are compared for the two different silo models considered in the present study.

Study on Seismic Performance of Symmetrical Steel Framed Building that with and without ERB and FPS Isolators

2012 ◽  
Vol 204-208 ◽  
pp. 2634-2640
Author(s):  
Dong Zhou Xia
Keyword(s):  
Base Isolation ◽  
Linear Time ◽  
Time History ◽  
Cost Effective ◽  
Design Guidelines ◽  
Northridge Earthquake ◽  
Base Shear ◽  
Rubber Bearing ◽  
History Analysis ◽  
Fixed Base

As is known, base isolation can reduce earthquake energy that transferred from the ground motion to the structure by buffering it with a bearing layer at the foundation which has relatively low horizontal stiffness. The paper investigates the time history records of a two storied symmetrical steel framed isolated building with Elastomeric Rubber Bearing and Friction Pendulum Systems that under the Northridge earthquake, and the isolator parameters are calculated using the design guidelines of International Building Code (IBC2000) within the spirit of IS 1893–2002(7). And then, contrasting of the roof’s displacements, accelerations and base shear values of the steel framed building with and without isolators, and which studied from the Non-linear time history analysis using structural analysis software SAP2000. The results show that base isolation will provide a substitute technology for the conventional, fixed-base design of structures and cost-effective for new buildings in high seismic regions.

scholarly journals Seismic Evaluation of Multi Storey Building with Ground Soft Story and with Infill Action

2021 ◽  
Vol 10 (6) ◽  
pp. 22-27
Author(s):  
mahaboob subhani* Shaik ◽  
Budda Beeraiah
Keyword(s):  
Spectrum Analysis ◽  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Ground Movement ◽  
Base Shear ◽  
Wall Area ◽  
History Analysis ◽  
The Impact

The improvements in (3D) three–dimensional underlying examination and processing assets have permitted the effective and safe plan of taller constructions. These constructions are the outcome of expanding metropolitan densification and financial suitability. The pattern towards continuously taller constructions has requested a move from the conventional strength based plan approach of structures to an emphasis on obliging the general movement of the design. Presently a day's supported cement (RC) divider outline structures are generally suggested for metropolitan development in zones with high SE danger. Presence of shear dividers bestows an enormous solidness to the sidelong power opposing arrangement of the RC building. Appropriate specifying of shear dividers can likewise prompt bendable conduct of such constructions during solid quake shaking. One of the remarkable boundaries impacting the shear divider (SD) SE (SE) conduct outline structures is the SD region proportion. In this manner a scientific examination is performed to assess the impact of Shear Wall Area to floor zone proportion (SW/FZP %) on the SE conduct of multistoried RC structures with delicate story at ground floor. For this reason, 12 structure plans that have Five, Eight and Twelve stories with SW/FZP % going somewhere in the range of 0.70% and 1.31% in the two ways are created. Here, the conduct of these plans under quake stacking is evaluated via doing Response Spectrum Analysis and Linear Time History Analysis utilizing primary examination programming E-TABS. Reaction Spectrum Analysis is finished by SE code IS 1893:2002. Straight Time History Analysis is completed by considering the three ground movement records to be specific Bhuj, Chamba and Uttarkasi. The primary boundaries considered in this investigation are the connection SW/FZP % has with base shear and rooftop dislodging, story uprooting and story float. The logical outcomes demonstrated that building plans with SW/FZP % equivalent to 1% acted sufficiently under tremor loads. Furthermore when the SW/FZP % expanded past 1% it is seen that the improvement of the SE presentation isn't as huge.

Effects of Pier Stiffness on the Seismic Response of Continuous Bridges with Irregular Configuration

2014 ◽  
Vol 638-640 ◽  
pp. 1794-1802 ◽  
Author(s):  
Si Si Wei
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
The Other ◽  
Relative Stiffness ◽  
History Analysis ◽  
Non Linear ◽  
Internal Forces

The seismic response of 4-span continuous bridges with different configurations has been investigated. In the series of bridges studied, the height of the central pier varies from 5 m to 100 m, while the heights of all the other piers remain the same. Using non-linear time history analysis, the internal forces at the bottom of individual piers have been predicted for each case. The correlation between the relative stiffness of adjacent piers and the ratio between the seismic response at the bottom of adjacent piers has been studied. Based on the results, in order to guarantee approximately balanced seismic response among all piers of a given bridge, a range of the relative column stiffness of two adjacent piers has been proposed.

scholarly journals The Effects of Using Different Seismic Bearing on the Behavior and Seismic Response of High-Rise Building

2017 ◽  
Vol 3 (3) ◽  
pp. 160-171 ◽  
Author(s):  
Saman Mansouri ◽  
Amin Nazari
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Time History ◽  
Bending Moment ◽  
Vertical Axis ◽  
History Analysis ◽  
Lead Rubber Bearings ◽  
Rc Building ◽  
Rubber Bearings ◽  
Seismic Response Of Buildings

The effects of using different seismic bearings were investigated to reduce the seismic response of buildings by assuming the vulnerability of 20-story regular RC building in this paper. The method of this study was that the studied building was studied in three different models in terms of its connection to the foundation. In the first model, the structures were placed on the rigid bearing and in the second and third models; lead-rubber bearings and friction pendulum bearings were placed at the counter between the structure and foundation, respectively. Then, the dynamic analysis was used to assess the behaviour and seismic response of the mentioned models. The results of the study showed that the structures in the first model functioned like cantilever column that would become uniaxial and biaxial bending under the effects of earthquake around the vertical axis of structure. Due to the tensile (tension) weakness in concrete, seismic loads caused major cracks in the tension part of the structures according to the place of the neutral axis that could lead to the collapse of structure. In addition, the use of mentioned seismic bearings under the earthquake caused the structure like a semi-rigid box slid on this equipment that reduced the structure's stiffness and increased the period of the structure in comparison with the first model. Using the studied seismic bearings caused the displacement of the roof of the first and twentieth stories of the structure become approximately equal and prevented the creation of the bending moment in the first model. The results of non-linear time history analysis showed that using the studied seismic bearings caused the response of the structure reduced significantly when the structure was placed on rigid bearings. It could be very valuable regarding the limitation of the capacity of the structure's members.

scholarly journals The implications of post-tensioning losses on the seismic response of Pres-Lam frames

2018 ◽  
Vol 51 (2) ◽  
pp. 57-69 ◽  
Author(s):  
Gabriele Granello ◽  
Alessandro Palermo ◽  
Stefano Pampanin ◽  
Tobias Smith ◽  
Francesco Sarti
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Moment Capacity ◽  
History Analysis ◽  
Supplemental Damping ◽  
Column Joint ◽  
Post Tensioning ◽  
Wall Foundation

Since 2010, twelve post-tensioned timber (Pres-Lam) buildings have been constructed throughout the world. In high seismic areas, Pres-Lam technology typically combines unbonded post-tensioning tendons and supplemental damping devices to provide moment capacity to beam-column, wall-foundation or column-foundation connections. Over time creep within the timber elements leads to losses in post-tensioning forces reducing the connection moment capacity. This paper analyses how different post-tensioning loss scenarios, depending on the beam-column joint detailing, impact the building’s seismic response. Two case study buildings were designed and investigated using the Acceleration Displacement Response Spectrum (ADRS) method and Non-Linear Time History Analysis (NLTHA) to predict seismic performance. These buildings were considered to be located in areas of high and low seismic risk, leading to designs with and without the use of damping devices, respectively. The results show that the building with additional damping responded with similar peak displacements, even under extreme loss scenarios. In comparison, when supplemental damping was not used, peak displacements increased significantly with post tensioning losses.

scholarly journals Time history analysis of an existing structure in accordance with Turkish and European standards

2021 ◽  
Author(s):  
Sinem Tola ◽  
Joaquim Tinoco ◽  
José C. Matos ◽  
Elişan Filiz Piroğlu
Keyword(s):  
Seismic Analysis ◽  
Linear Time ◽  
Time History ◽  
Steel Structure ◽  
Time History Analysis ◽  
Base Shear ◽  
Seismic Fault ◽  
History Analysis ◽  
European Standards ◽  
Lateral Displacements

<p>Turkey is located on active seismic fault lines. Having this major issue makes the seismic performance analysis a critical step to decide the safety or whether demolishing or reinforcing is more efficient. In this study, a seismic analysis comparison is performed on an existing steel structure via SAP2000 software. The seismic analysis method is Linear Time History Analysis. A comparison of results attained from dynamic analysis is obtained for an existing steel structure serving as a garage in Istanbul, Turkey. The results are demonstrated using graphics where base shear forces as well as lateral displacements obtained for two models are plotted for comparison.</p>

scholarly journals Effect of Number and Position of Rotational Friction Dampers on Seismic Response of Steel Frame

2019 ◽  
Vol 21 (1) ◽  
pp. 99-104
Author(s):  
Ionuț-Sergiu Oance ◽  
Sunai Gelmambet
Keyword(s):  
Seismic Response ◽  
Structural Response ◽  
Time History ◽  
Steel Frame ◽  
Base Shear ◽  
Friction Dampers ◽  
Stiffness Constant ◽  
Time Period ◽  
History Analysis ◽  
Energy Dissipated

Abstract This paper deals with effect of number and position of friction dampers on seismic response of 2D steel frame. For the present study four structures with six storeys are subjected to a time history analysis. For each story are using two, four and six friction dampers with different positions keeping slip load and stiffness constant. To study the effect of number and position of dampers in structures, are analysed the time period, top roof displacement, maximum base shear and percentage energy dissipated in accordance with energy induced in the frame. The results indicate that number and placement of damper affects the structural response. A large number of dampers do not always lead to best benefit in terms of energy dissipation.

scholarly journals The Seismic Investigation of Off-Diagonal Steel Braced RC Frames

2018 ◽  
Vol 26 (3) ◽  
pp. 49-64 ◽  
Author(s):  
Keyvan Ramin ◽  
Mahmoud R. Maheri
Keyword(s):  
Time History ◽  
Base Shear ◽  
Rc Frames ◽  
Steel Bracing ◽  
History Analysis ◽  
Out Of Plane ◽  
Ductile Steel ◽  
Frame Systems ◽  
Bracing System ◽  
Hysteresis Response

Abstract Steel bracing may be used to enhance the seismic strength of RC frames. Concentric steel bracing generally reduces ductility, which is a key component of seismic design. To overcome the problem, ductile steel brace-RC frame systems are therefore usually introduced in the form of eccentric braces. In the present study, the Off-Diagonal Bracing System (ODBS), which works as a concentric type of bracing, is investigated. In this paper the response of ODBS elements to cyclic loading is first explored and compared with those of other types of bracing such as X-bracing and inverted-V bracing systems. The time history analysis responses and cyclic hysteresis responses of a number of lowrise to mid-rise RC frames retrofitted with different types of bracing systems are then evaluated and compared. It is shown that under seismic excitation, a much reduced base shear is experienced by frames retrofitted with ODBS compared to other bracing systems. The results of time history and cyclic hysteresis response analyses also indicate a far greater energy dissipation capacity and ductility for the ODBS compared to other bracing systems. It is also concluded that ODBS performs best in lowrise frames. The out-of-plane buckling response of the ODBS is also investigated, and it is shown that a double-plated central connection can control such an adverse response.

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