scholarly journals Performance-based assessment of response reduction factor of RC-elevated water tank considering soil flexibility: a case study

2018 ◽  
Vol 10 (3) ◽  
pp. 233-247 ◽  
Author(s):  
Kashyap N. Patel ◽  
Jignesh A. Amin
Keyword(s):  
Reduction Factor ◽  
Water Tank ◽  
Response Reduction Factor ◽  
Performance Based Assessment ◽  
Soil Flexibility ◽  
Elevated Water

scholarly journals Performance Based Assessment of Seismic Response Factor for SMRF Staging Elevated Water Tank

10.29007/n83t ◽  
2018 ◽  
Author(s):  
Kashyap Patel ◽  
Jignesh Amin
Keyword(s):  
Seismic Response ◽  
Pushover Analysis ◽  
Nonlinear Behavior ◽  
Response Factor ◽  
Water Tank ◽  
Performance Based Assessment ◽  
Soil Flexibility ◽  
Elevated Water ◽  
The Impact ◽  
R Factors

RC staging water tanks are essential facilities that are expected to remain operational even after sever earthquakes. The seismic design codes/standards of most countries incorporate the nonlinear response of a structure through a ‘seismic response factor’ (R). This factor permits a designer to use a linear elastic force based design while accounting for nonlinear behavior and deformation limits. In this paper orderly approach is deputed to determine the seismic response factor of elevated water tank having different soil flexibility. For nonlinear static pushover analysis finite element method is used. The capacity curve of each model is generated and the ‘R’ factors are obtained such wise. The impact of soil flexibility on seismic response factor of RC framing tank is evaluated. ‘R’ factors are determined for existing tanks at two performance level.

scholarly journals Seismic Performance of Elevated Reinforced Concrete Water Tanks

2021 ◽  
Vol 16 (1) ◽  
pp. 51-60
Author(s):  
Sandesh Sagar Tripathi ◽  
Kamal Bahadur Thapa
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Research Work ◽  
Reduction Factor ◽  
Water Tank ◽  
Geological Condition ◽  
Response Reduction Factor ◽  
Economical Design ◽  
Elevated Water ◽  
Water Tanks

Most of the codal provisions used worldwide for the design of elevated water tanks incorporates the nonlinear response through reduction factor that considers overstrength, ductility and redundancy. The majority of these codes provide a value which incorporates the demand of their geological condition and construction industry. In Nepal, there is lack of own guidelines and codes for the seismic design of elevated water tanks. In the present work, seismic performance of elevated reinforced concrete (RC) Intze type water tank is evaluated and value of the response reduction factor (R) for the design of such tank is determined. In this research work 34 models of elevated reinforced water tank were analyzed using SAP 2000 to evaluate the seismic performance with varying tank filling condition and staging height for 450 cumec and 225 cumec capacity. Based on the results, it is concluded that single value of response reduction factor cannot be justified for all heights and capacity of elevated RC water tank. So, for economical design purpose, estimation of response reduction factor with exact analysis is preferred.

scholarly journals Seismic performance of existing water tank after condition ranking using non-destructive testing

2019 ◽  
Vol 11 (4) ◽  
pp. 395-410 ◽  
Author(s):  
Chittaranjan B. Nayak ◽  
Sunil B. Thakare
Keyword(s):  
Seismic Vulnerability ◽  
Seismic Retrofit ◽  
Condition Index ◽  
Mode Shapes ◽  
Natural Phenomenon ◽  
Water Tank ◽  
Base Shear ◽  
Elevated Water ◽  
Non Destructive

Abstract There has been a collaborative attempt to address the seismic vulnerability of existing structures in India after an earthquake in Bhuj, Gujarat, in 2001. Seismic diagnosis and seismic retrofit for the existing tanks have become a remarkable issue to be worked since deterioration is a cosmopolitan and natural phenomenon. It is important to know the exact reason for distress and type of distress. To manage such issues, a proper method of repair and rehabilitation with detailed plans and methodology is required. This paper is aimed at evolving systematic investigation metrology for condition ranking procedure based on the analytical hierarchy process (AHP) and strengthening by various retrofitting strategies. For that case study, an existing elevated water tank is considered, which was designed according to state of the art over 40 years ago as per old Indian Standard (IS) code. The ranking assessment of the elevated service reservoir was carried out using different non-destructive tests (NDTs). DER, i.e., degree (D), extent (E) and relevancy (R) rating technique was employed to find out the condition index of the elevated service reservoir (ESR). After finding the condition ranking of the existing structure, an analysis was carried out using SAP 2000 to find the present-day seismic requirements using IS codes. After knowing the seismic demand of the water tank, various retrofitting methods were adopted for improving the drift capacity and flexural capacity of the structure. The results were finally used to address some of the critical issues of the seismic response of the retrofitted structure in terms of a time period, mode shapes, base shear, displacement, acceleration, and velocity. From the case study result of seismic retrofit for the existing elevated water tank, it is confirmed that a relatively simple seismic retrofit method is effective to keep the tank functional after an earthquake.

scholarly journals Analytical Investigation of Response Reduction Factor (R) for R.C. Elevated Water Tank with Non-linear Static (Pushover) Analysis

2021 ◽  
Author(s):  
Saurabh Kulkarni ◽  
S. S Kadam ◽  
P. B Zambare
Keyword(s):  
Soil Properties ◽  
Pushover Analysis ◽  
Reduction Factor ◽  
Soil Conditions ◽  
Water Tank ◽  
Response Reduction Factor ◽  
Finite Element Software ◽  
Nonlinear Static ◽  
Static Pushover Analysis ◽  
Nonlinear Static Pushover Analysis

In the present work, an attempt is made to investigate response reduction factor (R) values of different soil types by using nonlinear static (Pushover) analysis for R.C. elevated rectangular water tank structure. All the parameters were investigated by varying properties of soft, medium and hard soils to cover a method of nonlinear static (Pushover) analysis. The zone factor (Z) kept constant Z – III for pandharpur site location and capacity of 150 m3 tank full in condition. This has resulted into SAP 2000 finite element software. The analysis of response reduction factor (R) value was done under three different soil conditions i.e. soft soil properties, medium soil properties, and hard soil properties. Response reduction factor (R) values indicate that R.C. elevated rectangular water tank structure without soil properties behaves quite the one value as per codal provisions.

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.

scholarly journals Heating storage performance of a water tank–combined phase change material:An experimental case study

2017 ◽  
Vol 9 (10) ◽  
pp. 168781401772407 ◽  
Author(s):  
Ling Xie ◽  
Yifei Lv ◽  
Jun Lu ◽  
Yongcai Li ◽  
Shuli Liu ◽  
...  
Keyword(s):  
Phase Change ◽  
Water Tank ◽  
Storage Performance
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