An improved method for assigning a dynamic magnification factor to N-waves

1971 ◽  
Vol 19 (3) ◽  
pp. 373-376 ◽  
Author(s):  
G. Koopmann ◽  
R.M. Orris
Keyword(s):  
Improved Method ◽  
Magnification Factor ◽  
Dynamic Magnification Factor

Study on Dynamic Behavior of Ancient Timber Structures Roof

2013 ◽  
Vol 475-476 ◽  
pp. 1559-1562
Author(s):  
Jun Dai
Keyword(s):  
Dynamic Behavior ◽  
Vibration Isolation ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Maximal Response ◽  
Construction Technology ◽  
Magnification Factor ◽  
Finite Element Software ◽  
Moderate Earthquake ◽  
Dynamic Magnification Factor

The roof model of the palace timber buildings was established according to the construction technology of the Ying-tsao fa-shih. Based on its analysis of dynamic behavior with shaking table test and ANSYS finite element software, the dynamic behavior of structure and its maximal response under different conditions were gotten, and also the dynamic magnification factor of the beams layer and the whole structure were gotten, at last the results got by shaking table test was compared with the numerical simulation. Research shows that the nature frequency of the model is 1.486 Hz which is much bigger than that of the whole structure; the maximal displacement of beam layer gradually increases with the increase of ground motion intensity and the height of structure; the vibration isolation performance of semi-rigid tenon-mortise joints in rare earthquake (400gal) is better than that in moderate earthquake (220gal) and frequent earthquake (110gal); the dynamic magnification factor between layers was about 1, and roof 0.9 or so.

Study on the Characters of Seismic Response Spectra Based on China Financial Information Mansion

2014 ◽  
Vol 580-583 ◽  
pp. 1729-1733
Author(s):  
Ming Li ◽  
Yuan Qing Wang ◽  
Wei Tao ◽  
Bin Wang ◽  
Qing Xian Yu ◽  
...  
Keyword(s):  
Seismic Response ◽  
Response Spectrum ◽  
Response Spectra ◽  
Financial Information ◽  
Amplification Coefficient ◽  
Response Analysis ◽  
Magnification Factor ◽  
Characteristic Period ◽  
Seismic Coefficient ◽  
Dynamic Magnification Factor

Rare study is done on floor response spectrum of super-high rise building, but it is an important condition for the seismic response analysis of floor subsidiary structure. Therefore, based on the early calculation model of China Financial Information Mansion, the floor response spectrum is calculated under different input ground motion. The floor and ground response spectrum is compared with each other from the seismic coefficient, dynamic amplification coefficient, characteristic period and the form of response spectrum. The results shows that: the floor seismic coefficient and the magnification coefficient are greater or smaller than the ground ones, the biggest difference of which is nearly 1 times; all the floor character period are greater than the ground ones, the biggest difference of which is over 60%; there are obvious differences between the floor and ground dynamic magnification factor spectra form under some conditions, of which the second peak of the former one is probably very large, even near to the peak of the first one, while the latter has no such phenomenon. Therefore, during the process of calculating the seismic response of floor subsidiary structure, it is necessary to consider the change of floor seismic coefficient, dynamic magnification factor, characteristic period and spectra form based on the main structure.

scholarly journals Improved method of magnification factor calculation for the angiographic measurement of neurovascular lesion dimensions

2002 ◽  
Vol 3 (3) ◽  
pp. 255-259 ◽  
Author(s):  
Zhou Wang ◽  
Stephen Rudin ◽  
Daniel R. Bednarek ◽  
Laszlo Miskolczi
Keyword(s):  
Improved Method ◽  
Magnification Factor

scholarly journals Numerical simulation of transient processes in propeller shaft straining under ice loads

2020 ◽  
Vol 4 (394) ◽  
pp. 70-75
Author(s):  
Anatoliy V. Aleksandrov ◽  
Trifon R. Rybalko
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Propeller Shaft ◽  
Magnification Factor ◽  
Dynamic Setting ◽  
Magnification Factors ◽  
Ice Loads ◽  
Ice Field ◽  
Dynamic Magnification Factor

Object and purpose of research. The object of the research is the shaftline of an icebreaker and ice-going vessels, the purpose is to develop an algorithm for determining the loads for calculating the strength of the shafts of icebreakers and icegoing vessels under ice loads in a nonlinear dynamic setting and determining the dynamic magnification factor. Materials and methods. The study is based on finite element method (FEM). Main results. As a result of numerical analysis, the magnification factors of ice loads acting on the propeller shaft when vessel moves in an ice field up to 4 m thick are investigated. Conclusion. The research results can be used to calculate the fatigue strength of the icebreakers and ice-going vessels shaftlines.

Research of Seismic Effect for Light Steel Structure with Added Stories

2014 ◽  
Vol 1030-1032 ◽  
pp. 838-842
Author(s):  
Pei Cheng Wu ◽  
Xue Qing Tang ◽  
Shou Cai Ma
Keyword(s):  
Theoretical Analysis ◽  
Safety Factor ◽  
Steel Structure ◽  
Seismic Effect ◽  
Seismic Action ◽  
Existing Buildings ◽  
Base Shear ◽  
Magnification Factor ◽  
Action Effect ◽  
Dynamic Magnification Factor

Light steel structure with added stories is a economic and effective method of strengthening design for existing buildings, and it is promoted and applied widely. But it still has some problems about computing of seismic action effect. The computing is not simply in accordance with the base shear method. The value of dynamic magnification factor which was counted as ß needs further research. In this paper, the value of is 2 on the basis of theoretical analysis and calculation example. The safety factor of the value is higher, and the design with the ß is more economic and reasonable.

scholarly journals Shaking Table Test Study on Seismic Performance of Hollow Rectangular Piers

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Yanli Shen ◽  
Bo Wei
Keyword(s):  
Energy Dissipation ◽  
Ground Motion ◽  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Magnification Factor ◽  
Axial Compression Ratio ◽  
Dynamic Magnification Factor

To study the seismic performance of hollow reinforced concrete piers under dynamic loads, nine hollow pier specimens with different stirrup ratios, reinforcement ratios, and axial compression ratios are designed and manufactured. The El Centro wave, Taft wave, and artificial Lanzhou wave are selected as seismic excitation for the shaking table test. The effects of the reinforcement ratio, stirrup ratio, and axial compression ratio on the failure mode, period, damping, acceleration and displacement response, dynamic magnification factor, ductility, and energy dissipation of specimens under different working conditions are studied. The results show that all the nine reinforced concrete piers have good seismic performance. Subjected to ground motion excitation, horizontal through cracks appeared on the pier surface. With the increase of ground motion excitation, the period of piers increases but the maximum period does not exceed 0.62 s, and the damping ratio increases as well and ranges from 0.02 to 0.064. With the increase of the ground motion excitation, the acceleration response of pier specimens increases, the dynamic magnification factor decreases, the displacement ductility coefficient decreases, and the energy dissipation of the specimens increases. The reinforcement ratio, stirrup ratio, and axial compression ratio have different effects on the above parameters. The test results can provide reference for seismic design of hollow rectangular piers and have certain engineering significance and value.

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