Non-Linear Time History Analysis of an Elevated Water Tank

2021 ◽  
Vol 9 (VI) ◽  
pp. 4327-4334
Author(s):  
Mr. Rohit Kiran Chaudhari
Keyword(s):  
Reinforced Concrete ◽  
Seismic Analysis ◽  
Linear Time ◽  
Time History ◽  
Seismic Energy ◽  
Soil Condition ◽  
Mode Shapes ◽  
Water Tank ◽  
Elevated Water ◽  
Water Tanks

It was discovered that reinforced concrete elevated water tanks with frame staging outperformed reinforced concrete elevated water tanks with shaft staging in terms of seismic resistance. These can be due to the frame staging's seismic energy absorption capability. As a result, the primary goal of this research is to better understand the seismic behavior and performance characteristics of elevated water tanks with frame staging. Furthermore, when compared to other shapes, circular tanks have the smallest surface area for a given tank size. As a result, the amount of material needed for a circular water tank is less than for other shapes. As a result, a circular water tank was chosen, and seismic analysis of elevated RC circular water tanks was carried out according to IITK-GSDMA guidelines, with the behavior of the water tank analysed for various parameters such as zone factor, soil condition, and different staging heights. SAP 2000 was used to determine the structure's modal characteristics (mode shapes and modal participation mass ratio).

scholarly journals Innovative Experimentation on Hollow Cylindrical Shells of Reinforced Concrete under Axial Compressive Load

2019 ◽  
Vol 8 (3) ◽  
pp. 2044-2049
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Structural Model ◽  
Testing Machine ◽  
Compressive Load ◽  
Water Tank ◽  
Critical Question ◽  
Axial Compressive Load ◽  
Elevated Water ◽  
Water Tanks

Reinforced concrete elevated water tanks supported on shaft type staging system are popularly constructed now a days for storage of water for water supply schemes. If slip form is used for casting of the shaft staging, the water towers generally require lesser time for construction. Elevated water tanks are top heavy structure especially in the tank full condition. It is often a critical question in structural design that what should be the proper structural model adopted for design of such class of structure. Should the shaft be designed as a hollow cylindrical column subjected to axial compression or is it essentially a R.C. cylindrical shell subjected to membrane forces under axial compression. To better understand it is proposed to cast such R.C. shells and after water curing for 28 days shall be subjected to axial compressive load in a compressive strength testing machine. The failure pattern of the shells shall be observed critically to get a proper understanding of behavior of such R.C shaft supported elevated water tank structures.

scholarly journals Analysis of Reinforced Concrete Intze Water Tank with Different Staging Heights in Different Seismic Zones

2020 ◽  
Vol 8 (6S) ◽  
pp. 185-190
Keyword(s):  
Water Distribution ◽  
Seismic Analysis ◽  
Hydrodynamic Pressure ◽  
Soil Condition ◽  
Soil Types ◽  
Water Tank ◽  
Seismic Zone ◽  
Lateral Forces ◽  
Seismic Forces ◽  
Water Tanks

RC intze water tanks are constructed for storage and suppling of water through a certain height with adequate pressure of water distribution. Many overhead water tanks affected due to certainty like earthquake that can induce large lateral forces. So, there is a necessity to Understand and examine the behavior of intze tank supported on framing in context to different soil types under the seismic forces. This paper evaluates the experimental output of seismic analysis that compares shear and moments at base and also hydrodynamic pressure at wall and base slab for various seismic zone and different type of soil condition at different staging heights.

scholarly journals Seismic Behavior of RC Intze Water Tank under Various Zone and Soil Condition

2020 ◽  
Vol 9 (3S) ◽  
pp. 22-25
Keyword(s):  
Seismic Behavior ◽  
Water Distribution ◽  
Seismic Analysis ◽  
Soil Condition ◽  
Soil Conditions ◽  
Water Tank ◽  
Seismic Zone ◽  
Zone Ii ◽  
Seismic Forces ◽  
Water Tanks

RC intze water tanks are constructed for storage and suppling of water through a certain height with adequate pressure of water distribution. Many overhead water tanks affected due to certainty like earthquake that can induce large lateral forces. So, there is a necessity to Understand and examine the behavior of intze tank supported on framing in context to different soil types under the seismic forces. This paper evaluates the experimental output of seismic analysis that compares shear and moments at base for different seismic zone (II, III, IV, V) in different type of soil conditions.

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 Use ofIn-SituDynamic Measurements to Calibrate Analytical Models of RC-Elevated Water Tanks

2012 ◽  
Vol 19 (5) ◽  
pp. 903-914
Author(s):  
H.M. Lopes ◽  
C.S. Oliveira
Keyword(s):  
Water Supply ◽  
Analytical Models ◽  
Ambient Vibration ◽  
Mode Shapes ◽  
Water Supply Systems ◽  
Water Tank ◽  
Analysis And Design ◽  
Elevated Water ◽  
Water Tanks

Before establishing the priority settings for the reduction of seismic risk of water supply infrastructures, it is necessary to understand the dynamic behavior of elevated water tanks, which are components of those infrastructures. Among other information, the main frequencies of vibration of these structures must be estimated and the analytical models used in their analysis and design should reproduce the frequency values obtained by in-situ dynamic tests. This work focuses exclusively on reinforced concrete (RC) elevated water tanks (200–750 m^3 of water at heights of 30–40 m), which are very common structures in the water supply systems in Portugal since the mid XXth century. This type of structures can also be seen in many regions around the world. First, a nationwide survey was conducted to determine the most common typologies in the country in terms of structural layout. Second, an in-situ campaign using ambient vibration as input was performed for a group of selected structures to determine the main frequencies of vibration and to identify modal shapes and damping values. Third, a finite element model of several different typologies was developed using the water simply as a concentrated mass at the top; the elastic properties of the model of the structure including the foundation were calibrated, so that the frequencies of various mode shapes obtained by the analytical model would match the frequencies of the real structure. Finally, an expression was derived to estimate the fundamental frequency of a group of elevated water tank typologies based on the total mass at the top of the supporting structure, which include the water, the global lateral stiffness, and the height of the tank. This study, providing important information on the frequencies of vibration of RC-elevated water tanks, contributes in a definite way to the analysis and design of such water tanks.

scholarly journals Analysis of Circular Elevated Service Reservoir Using STAAD Pro by Considering the Effect of Continuity

2021 ◽  
Vol 11 (4) ◽  
pp. 2603-2615
Author(s):  
Priyanka M. Mankar ◽  
H.R. Nikhade ◽  
Er. Minal Dehadrai ◽  
Khalid Ansari
Keyword(s):  
Seismic Analysis ◽  
Water Tank ◽  
Practical Application ◽  
Wind Analysis ◽  
The Common ◽  
Elevated Water ◽  
Water Tanks ◽  
Early Damage ◽  
Economical Losses ◽  
Continuity Analysis

In most regions of the country, early damage of elevated water tanks during their service life is becoming an increasing concern. The majority of damage occurs in tanks due to a lack of knowledge in design and ignoring continuity effect. Elevated water tank are used for storage of water at certain height and supplying water for essential usage. Hence damage of such structure endanger supply of drinking water and severe economical losses. The main purpose of this research is to determine the importance of continuity analysis in practical application and use of staadpro software to analyse an elevated circular water tank. The bottom joint of water tank is examined using continuity effect. This is the common joint where base slab, wall, bottom rings beam, gallery, column and base beam join. water tank is subjected to self-weight and hydrostatic Pressure due to water. Continuity effect increase stress, Hoop tension, BM hence its necessary to consider its effect while designing the tank. The results obtained from staadpro software is nearly same with manual result. This indicated that staadpro is suitable for design and analysis of water tanks. Three model having capacity of 55 m3, 125 m3 and 221 m3 situated in yavatmal, buldana and ramtek district is taken for analysis. Seismic analysis and wind analysis is also carried out on this model for safety purpose.

scholarly journals Performance of elevated water tank staging with base isolation under blast loading

2021 ◽  
Vol 309 ◽  
pp. 01134
Author(s):  
Boda Balaraju ◽  
Atulkumar Manchalwar
Keyword(s):  
Base Isolation ◽  
Linear Time ◽  
Time History ◽  
Water Tank ◽  
Base Shear ◽  
Isolation Technique ◽  
Underground Blast ◽  
Base Isolator ◽  
Fixed Base ◽  
Elevated Water

In this present study aims to evaluate the performance of base isolation device under different intensity blast induced ground excitations for an elevated water tank staging. In this study mainly focused to improve the performance of the base isolator and minimize the damage of the structure. To know the performance of base isolator two models are considered one is fixed base model and another one is supported with base isolator model for both non-linear time history analysis is carried out with the help of SAP 2000 software subjected to four different underground blast intensities. From the analysis, it is observed that by using base isolator supported model structural responsive parameters such as base shear, top storey accelerations are efficiently reduced when compared to the fixed base structure. Hence it is proved that adopting base isolation technique we considerably reduce the damage of the structure subjected to underground blast vibrations.

scholarly journals Seismic Analysis of Circular Water Tank Designed by Indian Standard Code and Euro Code

2021 ◽  
Vol 9 (10) ◽  
pp. 635-638
Author(s):  
Siddhnath Verma
Keyword(s):  
Seismic Analysis ◽  
Soft Soil ◽  
Soil Conditions ◽  
Water Tank ◽  
Base Shear ◽  
Seismic Behaviour ◽  
Soil Medium ◽  
Standard Code ◽  
Elevated Water ◽  
Water Tanks

Abstract: Water tanks are widely used for storage of drinking water. Water tanks and especially the elevated water tanks are structures of high importance which are considered as main lifeline elements that should be capable of keeping the expected performance i.e. operation during and after earthquakes. In this research paper, the analysis of the seismic behaviour of the elevated circular water tank by Indian standard code and Euro code is carried being carried out. The analysis is carried out on 35 cubic meter capacity elevated circular water tank in zone III and spectrum zone II and on three different soil conditions i.e. hard soil, medium soil and soft soil using ETABS software as per Indian standard code and European standard code. The results of base shear, base moment, storey displacement and storey drift are obtained from both codal provisions. Keywords: Elevated water tank, Seismic response, Etabs, Base shear, Base moment

scholarly journals Effect of Geometric Imperfection on the Dynamic of Elevated Water Tanks

2020 ◽  
Vol 6 (1) ◽  
pp. 85-97 ◽  
Author(s):  
Nasser Dine Hadj-Djelloul ◽  
M. Djermane
Keyword(s):  
Numerical Models ◽  
Time History ◽  
Dynamic Buckling ◽  
Three Dimensions ◽  
Nonlinear Time History Analysis ◽  
Water Tank ◽  
Geometric Imperfection ◽  
Elevated Water ◽  
Element Technique ◽  
Water Tanks

The elevated tanks are considered as very sensitive structures in seismic movement condition. Moreover, the conical steel tank manufacturing without local geometric imperfection seems to be too difficult. In generally, the latter is the most responsible factor to define the shell structures buckling capacity. For this reason, several theoretical and experimental researchers studied the performance of this type of structure under seismic loading.  The present study aims to demonstrate the local geometric imperfection effect on dynamic buckling of elevated water tank. Using the three dimensions finite element technique to study the seismic response of perfect and imperfect elevated water tank was established taking into account the following factors; the interaction fluid structure (FSI), the wall flexibility, the local geometric imperfection, the nonlinear time history analysis, the material and geometric nonlinearity, and this by the application of three different instability criteria for the critical PGA estimate. The critical PGA of the imperfect elevated water tank numerical models decreased by 45, 45% compared to the elevated water tank numerical model without local geometric imperfection. The obtained results confirm the local geometric imperfection effect on dynamic buckling of elevated water tanks.

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