Seismic Analysis of Long Span Double-Curved Arch Bridge

2012 ◽  
Vol 594-597 ◽  
pp. 1532-1536
Author(s):  
Yun Zhang ◽  
Xiu Feng Huang ◽  
Bei Li
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Element Model ◽  
Dynamic Features ◽  
Arch Bridge ◽  
Long Span ◽  
Crown Structure ◽  
History Analysis ◽  
Rare Earthquake

Take one long span double-curved arch bridge as the example, built the finite element model of bridge structure and analyzed the modeling method, dynamic features and response under ground motion. It demonstrates that response spectrum method could meet the calculation requirement in seismic analysis of the double-curved arch bridge, and the result accords with time-history analysis method. Bridge vibration type is dispersing in quality distribution of double-curved arch bridge; it should take adequate vibration types in bridge combination. At frequent earthquake, it is actual to considerate the coalition function between arch crown structure and the main arch ring. But at rare earthquake, the arch crown buildings of masonry structure is easy to be damaged, it is not suitable to considerate the coalition function in bridge reinforcement.

Response Spectrum Characteristics of Near-Fault Ground Motions and Influence to CFST Arch Bridge

2013 ◽  
Vol 671-674 ◽  
pp. 1367-1371
Author(s):  
Fan Xing ◽  
Rui Kang
Keyword(s):  
Response Spectrum ◽  
Ground Motions ◽  
Time History ◽  
Arch Bridge ◽  
Response Characteristics ◽  
Near Fault ◽  
Long Span ◽  
History Analysis ◽  
Cfst Arch Bridge ◽  
The Common

Near-fault ground motions are more complex than the common far field, and it can significantly change the response characteristics of the structure. The records of Taiwan chi-chi earthquake associating with velocity pulse are selected, and the seismic accelerate response spectrum of different site are studied in deep. On the basis of time-history analysis, the seismic responses of a long-span CFST (concrete-filled steel tubular) arch bridge are discussed. Weakness section of the CFST arch rib are also indicated, providing a valuable reference for aseismic design.

scholarly journals Review on Seismic Analysis of Multistoried Building in Hilly Region

2021 ◽  
Vol 9 (12) ◽  
pp. 73-79
Author(s):  
Harsh Joshi
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Center Of Mass ◽  
Time History ◽  
Lateral Loads ◽  
Base Shear ◽  
Building Frames ◽  
Building Frame ◽  
History Analysis ◽  
Hilly Region

Abstract: Due to sloping land and high seismically active zones, designing and construction of multistory buildings in hilly regions is always a challenge for structural engineers. This review paper focuses to establish a review study on the Possible Types of building frame configuration in the hilly region and he behavior of Such building frames under seismic loading conditions, and (3) The recent research and developments to make such frames less vulnerable to earthquakes. This paper concludes that the dynamics characteristics of such buildings are significantly different in both horizontal and vertical directions, resulting in the center of mass and center of stiffness having eccentricity at point of action and not vertically aligned for different floors. When such frames are subjected to lateral loads, due to eccentricity it generates torsion in the frame. Most of the studies agree that the buildings resting on slanting ground have higher displacement and base shear compared to buildings resting on plain ground and the shorter column attracts more forces and undergoes damage when subjected to earthquake. Keywords: Building frame configuration, Seismic behavior, Dynamic characteristics, Response spectrum analysis, time history analysis.

Evaluation of Seismic Integrity for an Integral Reactor Assembly

2004 ◽  
Author(s):  
Soon Myeon Wang ◽  
J. S. Kim ◽  
T. E. Jin ◽  
M. J. Jhung ◽  
Y. H. Choi ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Seismic Analysis ◽  
Coupling Effect ◽  
Response Spectrum ◽  
Safety Margin ◽  
Time History ◽  
Element Model ◽  
Seismic Safety ◽  
Reactor Assembly ◽  
Integral Reactor

The structural integrity of integral reactor assembly of 65Mwt thermal capacity is assessed by using the commercial finite element package ANSYS in order to evaluate the seismic safety margin. First of all, the modal analyses are performed using the various analysis models with/without the fluid coupling effect in order to validate a super element model and to evaluate the coupling effect on natural frequency. Based on the modal analysis results, the seismic analyses are performed using the ground response spectrum defined in Reg. Guide 1.60. Finally, time-history analyses are performed using the modal analysis results, the super element model and an inertia load approach. As a result, the reliable and efficient seismic analysis model for an integral reactor assembly is developed and it is found that an integral reactor assembly has the sufficient seismic safety margin.

Sensitivity of the Effective Seismic Support Damping in a Class I Piping System to Analysis Parameters

2009 ◽  
Author(s):  
Nima Zobeiry
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Class I ◽  
Piping System ◽  
Frequency Content ◽  
Response Spectrum Analysis ◽  
History Analysis ◽  
The Coefficient Of Friction ◽  
Seismic Damping

It is understood that the level of seismic damping in a piping system is strongly influenced by the supports. Put differently, the supports contribute to an effective damping that can be considered in the seismic analysis of the piping system. This paper investigates the issue for the feeder pipes of a CANDU™ reactor. Feeders are numerous class I pipes in parallel, which are separated by frictional spacer elements. The results of a time history analysis, taking into account different damping mechanisms, are compared to those from a response spectrum analysis to deduce the effective damping in the system. The sensitivity of the effective damping to different parameters, such as the coefficient of friction and the input frequency content, is investigated.

Floor Response Spectrum Method of Multiply Supported Piping System Assisted by Time History Analysis

2020 ◽  
Author(s):  
Yoshihiro Takayama ◽  
Ayaka Yoshida ◽  
Iriki Nobuyoshi ◽  
Eiichi Maeda
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Correlation Coefficients ◽  
Time History Analysis ◽  
Piping System ◽  
Response Spectrum Method ◽  
Sum Rule ◽  
Spectrum Method ◽  
History Analysis

Abstract The independent support motion response spectrum method (ISM) is currently used for seismic analysis to calculate the response of multiply supported piping with independent inputs of support excitations. This approach may derive considerable overestimation in the combination of group responses under the absolute sum rule of NUREG-1061 [1]. Then authors have developed an advanced method of the ISM approach named SATH (Spectrum Method Assisted by Time History Analysis). In the SATH method, both of floor response spectra and time histories of floor acceleration are used as independent inputs of support excitations. The group responses are summed with correlation coefficients which are calculated by considering each time history of modal response by independent inputs of support excitations. In this paper, the necessity of taking the effects of correlation coefficients for the group responses into account in the ISM approach is examined. The SATH method has advantage to derive a more realistic sum rule of the group responses and applicability for the actual design.

Seismic Response Analysis of an Adsorption Tower Based on ANSYS

2010 ◽  
Vol 102-104 ◽  
pp. 150-154
Author(s):  
Xiao Ping Hu ◽  
Xiao Ping Ye
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Time History ◽  
Element Model ◽  
Response Analysis ◽  
Seismic Load ◽  
Engineering Practice ◽  
Current Standard ◽  
History Analysis ◽  
Tower Equipment

The seismic load usually has a significant hazard to the safety of the tower equipment, so it’s important to execute of seismic design in engineering practice. In this paper, the time history analysis of the seismic response is carried out with the help of ANSYS software for the finite element model of the adsorption tower. Relevant time history data is obtained. Compared with seismic analysis of the current standard method, corresponding suggestions are given.

Research on Dynamic Response with Complicated Structure System

2011 ◽  
Vol 105-107 ◽  
pp. 339-343
Author(s):  
Yue Qiang ◽  
He Jian ◽  
Li Li
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Internal Force ◽  
Structure Design ◽  
Dynamic Features ◽  
Complicated Structure ◽  
Structure System ◽  
High Rise ◽  
History Analysis ◽  
Rare Earthquake

With the complex high-rise and extra-high buildings construction, dynamic characteristics of these structures are more and more paying close attention and researching. At the same time, the dynamic response of high-rise building with complicated structure system is always a hot and difficult research, and it is going to be further developed on the research of dynamic features, displacement and internal force. Selecting a complicated systematical structure of a city, using finite element to establish the model and inputting rare earthquake wave, this paper carried out an analysis on the natural vibration characteristics, relative storey displacement and maximum shear of the structure by applying dynamic elastoplastic time history analysis method, drawing the conclusion that the structure design is safe and putting forward the corresponding improvement measures.

Seismic Behaviors of Suspend Dome Structure

2011 ◽  
Vol 147 ◽  
pp. 249-253
Author(s):  
Qing Zhang ◽  
Jing Cao ◽  
Zhi Gang Song ◽  
Yue Gui ◽  
Cheng Wei Huang
Keyword(s):  
Seismic Performance ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Single Layer ◽  
History Analysis ◽  
Dome Structure ◽  
Cable Dome ◽  
Reticulated Shell Structure ◽  
Seismic Behaviors

As a new type of structural form, the suspend dome structure combines both advantages of the single layer reticulated shell structure and the cable dome structure. The anti-seismic performance of suspend dome have been analyzed by employing a computational model of the Kiewitt suspend dome with 40m span．The different seismic behaviors of time history analysis and response spectrum analysis are analyzed and compared. Some valuable conclusions are drawn for practical design. The results of anti-seismic analysis indicated that the components of the structure were in the elastic period，and had a good anti-seismic performance under 8 degree（0.2g）earthquake.

Research on Analysis Method of Seismic Response of Long Span Cable-Stayed Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 2228-2232
Author(s):  
Xu Li ◽  
Sheng Ping Wu ◽  
Zhen Zheng Fang
Keyword(s):  
Seismic Wave ◽  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Seismic Load ◽  
Analysis Method ◽  
Cable Stayed Bridge ◽  
Spectrum Method ◽  
Long Span ◽  
History Analysis

The response of the long-span cable-stayed bridges under seismic load is complex. Reasonable methods is very important to analyze the seismic performance. In this paper, a practical project is taken as research background which is double pylon cable-stayed bridge with main span of 416m. Two artificial seismic waves and two seismic records were selected to analyze the seismic behaviors by the response spectrum method, time history analysis method and power spectrum method. The result shows that seismic responses of the girder and main tower are basically identical under the effect of artificial seismic wave. The response spectrum analysis results of them are between the other two methods under the effect of the natural seismic wave. For stay cable, time history analysis results has great difference compared with results of other two methods. Therefore, different methods should be choosed base on specific circumstances to analyse the earthquake response of this structure.

scholarly journals Seismic Design of Steel Structures with Special Flexural Frame Based on Performance by Durability Method

2018 ◽  
Vol 4 (12) ◽  
pp. 2926
Author(s):  
Pouyan Ashrafzadeh ◽  
Arash Kheyrolahi
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Structural Response ◽  
Time History ◽  
Steel Structures ◽  
Finite Element Software ◽  
Durability Analysis ◽  
History Analysis ◽  
Time Histories ◽  
Minimum Number

Equivalent static, response spectrum and time history analysis are the well-known analysis methods that traditionally proposed. These methods are highly accurate but requires a great deal of time to match accelerations and the number of analyses, in the other words these methods are time consuming methods. Hence recently the structures are investigated using the durability time method, which plays an essential role in reducing the number of analyses that needs to be created; In fact, the durability time method is a new method of seismic analysis that is presented with a minimum number of time histories analysis. In this method the structure is placed under the influence of an increasing dynamic stimulation, structural response has been investigated over time and evaluated according to the corresponding response to different levels of stimulation intensity, strengths and weaknesses, and structural performance. In this study, steel folding frameworks with 5, 10 and 15 floors were investigated under two analytical methods (Time durability and Time histories methods). At first, the frameworks will be exposed under history of Imperial Governor, Kobe and Lumaprita earthquakes and analysis by finite element software ABAQUS. Then, based on the three analytical functions, the durability is investigated and the results are compared with each other. Finally, the behavior of the structures discussion and conclusion. The results show that the durability analysis method for earthquakes with higher intensity and time is more efficient, and for the Time-less earthquakes by time history method parametrically have a parametrical difference of 5%.

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