Damping Effect of Story Isolation Structure Considering Different Positions of Isolation Layer

2013 ◽  
Vol 353-356 ◽  
pp. 2105-2109
Author(s):  
Guo Chen Zheng ◽  
Hang Li Xu
Keyword(s):  
General Structure ◽  
Time History ◽  
Dynamic Responses ◽  
Natural Period ◽  
Absolute Acceleration ◽  
Isolation Layer ◽  
Damping Effect ◽  
History Analysis ◽  
Story Drift ◽  
Damping Effects

The multi-mass analysis models of story isolation and general structure are established, major parameters are optimized on story isolation structure, with time-history analysis for isolation layers in different position, the contributions of modes and damping effects of absolute acceleration and story drift about story-isolation structure are analysed. Result indicates that after the parametric optimization, the natural period of story-isolation structure is longer than that of general structure; no matter where the position of isolation layer is, the damping effects are always obviously; the position of isolation layer has direct influence on the damping effect, damping effect gradually reduce when the isolation layer raised, and the contributions of high modes to dynamic responses increase; it's worth noting that infrastructure absolute acceleration magnify to some extent compared with general structure.

Elastic-Plastic Analysis on Damaged Multi-Tower Isolation Structure with an Enlarged Base

2011 ◽  
Vol 255-260 ◽  
pp. 2550-2554 ◽  
Author(s):  
Nan Zhao ◽  
Hai Xia Geng ◽  
Kai Ma ◽  
Kang Ning Li
Keyword(s):  
Time History ◽  
Plastic State ◽  
Earthquake Response ◽  
Analysis Method ◽  
Plastic Hinges ◽  
Isolation Layer ◽  
Damping Effect ◽  
History Analysis ◽  
Rare Earthquake ◽  
Effect Of Structure

The analysis on earthquake response of one multi-tower isolation structure with an enlarged base in rare earthquake and aftershocks was carried out using elastic time history analysis method. It includes the damping effect of structure, plastic deformation of members and plastic hinges distribution in structure. The results show that isolation structure comes to plastic state under rare earthquake lighter, vertical elements remain flexible under earthquake aftershocks, the plastic hinges on horizontal members are deepen, but the structure can meet the requirement while it is renovated. Plastic hinges first appear in the bottom of structure, then they gradually develop upwards, Plastic hinges are generated at the ends of beams, but not occur in columns and walls. The displacement of structure under rare earthquake is mainly concentrated on isolation layer and it can take energy consumption by large displacement.

scholarly journals PERFORMANCE OF SEISMICALLY ISOLATED BUILDINGS USING SFP BEARING: AN APPLICATION IN VIETNAM

2020 ◽  
Vol 30 (06) ◽  
Author(s):  
NAM V. NGUYEN ◽  
HOA P. HOANG ◽  
THAN T. HUA
Keyword(s):  
Time History ◽  
Dynamic Responses ◽  
Structural Vibration ◽  
Base Shear ◽  
Ground Acceleration ◽  
History Analysis ◽  
Earthquake Resistant ◽  
Story Drift ◽  
Seismically Isolated ◽  
Friction Pendulum

At present, the use of structural vibration control technology in the design of earthquake resistant in Vietnam is very limited. In this paper, a performance evaluation of using single friction pendulum bearing (SFP) for earthquake resistant buildings with earthquake conditions in Vietnam is presented. A one-dimensional (1-D) model of a 5-storey building subjected to earthquakes was developed for time history analysis. Accordingly, the model is analyzed in two configurations: with and without SFP bearing. The ground acceleration data was selected and scaled to fit the design acceleration in Hanoi determined from TCVN 9386:2012. The dynamic responses of the two configurations was evaluated in detail. It is shown that the seismically isolated configuration can reduce the base shear up to 90%. A significant decrease in the inter-story drift and absolute floor acceleration was also observed.

Analysis of Seismic Dynamic Response of Tunnel in Karst Areas

2011 ◽  
Vol 90-93 ◽  
pp. 2108-2111
Author(s):  
Lin Jie Chen ◽  
Bo Liang ◽  
Zhi Yong Wang
Keyword(s):  
Dynamic Response ◽  
Soil Structure ◽  
Interaction Model ◽  
Time History ◽  
Side Wall ◽  
Internal Force ◽  
Dynamic Responses ◽  
Karst Caves ◽  
History Analysis ◽  
Karst Areas

Based on soil-structure interaction model, the seismic dynamic response of tunnel in karst areas were performed by using viscous-spring artificial boundary and time history analysis method. In combination with the Menglian tunnel engineering on the Bao-Teng Highway in Yunnan, in different sizes and sites karst caves conditions, the dynamic responses of displacement and internal force on control points of the tunnel structure were obtained. The results show that comparatively large interal forces, under the high-intensity earthquake conditions, will appear on the side wall of the tunnel which through karst areas, less ones on arch crown and inverted arch parts, and the differential displacements of arch crown reach to the maximum. When the karst caves are located in the side of the tunnel, it make the seismic dynamic response get more large, which make the surrounding rock must be strengthened treatment. The results provide useful reference for the aseismatic design of tunnel.

Calculation and Analysis of a Tall Building Seismic Isolation Design

2013 ◽  
Vol 353-356 ◽  
pp. 2177-2180
Author(s):  
Hao Ming Cai ◽  
Zhong Tao ◽  
Xin Li Cao
Keyword(s):  
Seismic Design ◽  
Seismic Isolation ◽  
Time History ◽  
Tall Building ◽  
Wall Structure ◽  
Analysis Method ◽  
History Analysis ◽  
Story Drift ◽  
Rare Earthquake ◽  
Building Project

In this paper, we calculate and analyze a tall building project of seismic isolation design. It is a frame-shear wall structure, which has twelve stories on the ground. And then, we use the time history analysis method to calculate the isolation structure. It is found that isolation equipment can extend the period of the structure, reduce the story drift in frequency earthquake. And it also can control the response of the structure. In rare earthquake, the story drift can meet the demand of unclasped; the displacement and force of the equipment can satisfy the demand of the code for seismic design of building.

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.

Evaluation of N-M Model on Simulating Seismic Response of High-Rise SRC Structure

2013 ◽  
Vol 477-478 ◽  
pp. 1060-1063
Author(s):  
Guo Bin Bu ◽  
Jian Cai ◽  
Kang Ning Li
Keyword(s):  
Interaction Model ◽  
Time History ◽  
Bending Moment ◽  
Dynamic Responses ◽  
Biaxial Bending ◽  
Fiber Model ◽  
High Rise ◽  
History Analysis ◽  
Moment Interaction ◽  
Dynamic Time

The axial load-biaxial bending moment interaction model (N-M model) is developed based on the metal plasticity theory, and its reliability in structural analysis is evaluated. Employing CANNY program, linear and nonlinear dynamic time history analysis is conducted to a 32-story SRC structure. The dynamic responses are compared between N-M model and fiber model cases. The results show that N-M model can simulate well the dynamic response of the high-rise hybrid structures. Besides, N-M model has clear mechanical concept and is much simpler compared to fiber model, and the computational efficiency can be greatly improved by using N-M model.

Study on Seismic Behavior of Steel Frame with Different Brace Patterns

2011 ◽  
Vol 147 ◽  
pp. 231-235
Author(s):  
Yun Zou ◽  
Tian Qi Li ◽  
Da Lin Zhang ◽  
Peng Fei Zhang
Keyword(s):  
Structural Design ◽  
Seismic Behavior ◽  
Time History ◽  
Steel Frame ◽  
Structural Stiffness ◽  
Structural System ◽  
History Analysis ◽  
Story Drift ◽  
Practical Engineering ◽  
System Selection

In order to analyze dynamic characteristics of steel frame with different pattern braces, three structures with brace of X, V and Λ patterns were designed utilizing STS of PKPM software respectively. Sizes of main members were provided through designed. Based on structural design, time history analysis under different earth waves were made by using ANSYS to investigate the effects exerted from different pattern braces on structural stiffness. Results showed that three different braces played an important role in strengthening structural stiffness. Braces with V and Λ patterns had approximate properties. The story drift ratio and the overall torsion of three different braces met the requirements regulated by Chinese design codes. Conclusions might be useful in practical engineering design during structural system selection.

scholarly journals Response of Tall Structures Along Face Exposed to Blast Load Applied at Varying Distance

2020 ◽  
Vol 9 (1) ◽  
pp. 455-460 ◽  
Keyword(s):  
Linear Time ◽  
Time History ◽  
Cost Effective ◽  
Blast Load ◽  
Blast Loads ◽  
Building Models ◽  
Tall Structures ◽  
History Analysis ◽  
Story Drift ◽  
The Face

Blast loads caused by explosives are unexpected loads. These loads cause huge damage to the structure and decrease the strength and durability of structure, especially for elevated buildings. Therefore study of such loads is of major importance. In the present study, G+10 floors with second, third and end bays is modelled using ETABS and sudden impact dynamic load analysis is carried out. The analysis is carried out on the face directly exposed to the blast load for 7 building models. The blast loads are obtained with the help of TM5-1300 manual as well as ATBLAST software and Structure is designed in ETABS software by non-linear time history analysis. The results of this study help in understanding the behaviour of tall structures in terms of drift, displacement, joint acceleration and shear. Observations show that Model 7 is found to have extreme shear, storey displacement and inter-story drift. The research on examination of tall structures subjected to explosion is helpful in coming up with a better, cost-effective design for blast resistant structures.

Study on the Performance-Based Aseismic Design for RC Frame with Mild Steel Shear Damper

2014 ◽  
Vol 1065-1069 ◽  
pp. 1513-1517
Author(s):  
Zhen Huang ◽  
Rui Qiu Li ◽  
Lin Zhi Yang
Keyword(s):  
Mild Steel ◽  
Design Method ◽  
Time History ◽  
Performance Based Design ◽  
Rc Frame ◽  
Aseismic Design ◽  
History Analysis ◽  
Story Drift ◽  
Energy Dissipation Capacity ◽  
Rare Earthquake

The performance-based design of structure can reach the performance objectives under different earthquakes. Mild steel shear dampers (MSSDs) have a good and stable energy dissipation capacity, and are widely used in seismic reduction structure. This paper presents a performance-based aseismic design method for RC frame with mild steel shear dampers, the numerical model of frame was established by SAP2000, then seismic performance of the frame was studied by time history analysis. Compared with pure frame, the inter-story drift ratio of MSSD frame is significantly decreased under frequent, moderate and rare earthquake respectively, and the performance objectives are satisfied, demonstrating the effectiveness of the performance-based aseismic design method.

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