Seismic Response of RC Elevated Water Tank Considering Site Specific Acceleration Time History

2013 ◽  
pp. 451-463
Author(s):  
Chirag N. Patel ◽  
H. S. Patel
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Water Tank ◽  
Site Specific ◽  
Acceleration Time ◽  
Acceleration Time History ◽  
Elevated Water

A novel tuned mass-conical spring system for passive vibration control of a variable mass structure

2021 ◽  
pp. 107754632110004
Author(s):  
Sanjukta Chakraborty ◽  
Aparna (Dey) Ghosh ◽  
Samit Ray-Chaudhuri
Keyword(s):  
Variable Mass ◽  
Design Procedure ◽  
Time History ◽  
Tuned Mass Damper ◽  
Water Tank ◽  
Mass System ◽  
Mass Damper ◽  
Linear Spring ◽  
Spring System ◽  
Elevated Water

This article presents the design of a tuned mass damper with a conical spring to enable tuning to the natural frequency of the system at multiple values, as may be convenient in case of a system with fluctuations in the mass. The principle and design procedure of the conical spring in the context of a varying mass system are presented. A passive feedback control mechanism based on a simple pulley-mass system is devised to cater to the multi-tuning requirements. A design example of an elevated water tank with fluctuating water content, subjected to ground excitation, is considered to numerically illustrate the efficiency of such a tuned mass damper associated with the conical spring. The conical spring is designed based on the tuning requirements at different mass conditions of the elevated water tank by satisfying the allowable load bearing capacity of the spring. Comparisons are made with the conventional passive tuned mass damper with a linear spring tuned to the full tank condition. Results from time history analysis reveal that the conical spring-tuned mass damper can be successfully designed to remain tuned and thereby achieve significant response reductions under stiffening conditions of the primary structure, whereas the linear spring-tuned mass damper suffers performance degradation because of detuning, whenever there is any fluctuation in the system mass.

An Improved Source Model for Simulation Near-Field Strong Ground Motion Acceleration Time History

2013 ◽  
Vol 438-439 ◽  
pp. 1474-1480
Author(s):  
Ju Fang Zhong ◽  
Long Wei Zhang ◽  
Jun Wei Liang
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Response Spectrum ◽  
Near Field ◽  
Time History ◽  
Source Spectrum ◽  
Acceleration Time ◽  
Acceleration Time History ◽  
Spectrum Model ◽  
Strong Ground

The key to near-field strong ground motion simulation based on stochastic finite fault method is to determine the spectrum of ground motion. We present an improved source spectrum model for simulation near-field strong ground motion acceleration time history. We combine Masudas source spectrum model with scaling factor Hij to keep radiation energy conservation and reflect the energy decrease with frequency at low to mid frequencies. We calculate the Fourier amplitude spectrum Fa, accelerate response spectrum Sa, velocity response spectrum Sv and displacement response spectrum Sd of simulation time histories. By comparative analysis of the laws of spectrum values (Fa, Sa, Sv, Sd) with the variation of frequency or period, we discusses the effects of sub-fault dividing scheme, the method of determining scale factor and source spectrum model on spectrum values (Fa, Sa, Sv, Sd). The results show that sub-fault dividing scheme has slightly effect on the model presented in this paper, and the model enable to reflect the sink laws of source spectrum value in mid-to-low frequencies well. We demonstrate that the improved model is superior to other commonly used models.

scholarly journals Vibration Control of Water Tank Staging Equipped X-plate Damper

2019 ◽  
Vol 8 (4) ◽  
pp. 5551-5554
Keyword(s):  
Time History ◽  
Water Tank ◽  
Seismic Behaviour ◽  
Effective Technique ◽  
Linear Dynamic ◽  
Dissipation Of Energy ◽  
History Analysis ◽  
Steel Damper ◽  
Elevated Water ◽  
Water Tanks

During post-earthquake requirement the staging of elevated water tanks are considered as essential structures. Failure of staging leads to collapse of watertank so required to control the vibration of staging. In This paper elevated circular tank supported with frame was modeled to control the vibration of staging. Non-linear dynamic analysis (time-history analysis) was performed on model by using SAP2000 software to study the seismic behaviour. The additional dissipation of energy occurs by using damper constitute an effective technique for the earthquake reduction of staging members and In this study an attempt has been made to use the X-plate metallic steel damper for reducing the seismic response.

scholarly journals Generation of spectrum-compatible acceleration time history for Nepal

2017 ◽  
Vol 349 (5) ◽  
pp. 198-201 ◽  
Author(s):  
Hemchandra Chaulagain ◽  
Hugo Rodrigues ◽  
Humberto Varum ◽  
Vitor Silva ◽  
Dipendra Gautam
Keyword(s):  
Time History ◽  
Acceleration Time ◽  
Acceleration Time History
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