Seismic Analysis of Elevated Intze Type Water Tank (original) (raw)
Related papers
Effect of Staging Height on Seismic performance of Elevated Water Tank
Water is as important commodity as food and air for the existence of life. The overhead tanks which have been the inevitable part of water supply system are important public utility structures and industrial structure by the help of which the required water head can easily be achieved and water can be made available to all by the mere action of gravity. As known from very upsetting experiences, elevated water tanks were heavily damages or collapsed during earthquake. This was might be due to the lack of knowledge regarding the proper behavior of supporting system of the tank against dynamic effect and also due to improper geometrical selection of staging patterns. Due to the fluid-structure interactions, the seismic behavior of elevated tanks has the characteristics of complex phenomena. So there is necessity to understand the behavior of elevated water tanks supported on different types of staging under earthquake forces. For elevated water tank, shaft type staging and framed type of staging are normally used. In this study, an effort has been made to study the effect of staging height on seismic behavior of elevated water tank supported on frame type staging with consideration and modeling of impulsive and convective water masses inside the container for different zones and soil types. This study will be useful to the civil engineers to understand the seismic behavior of elevated water tanks supported on framed type staging situated in various earthquake zones.
Effect of Different Staging Configurations on Seismic Performance of Circular Elevated Water Tank
As known from very upsetting experiences adequately designed Elevated water tanks were heavily damaged or collapsed during earthquakes. Most of the damages observed during the seismic events arise due to causes like the lack of knowledge regarding the behavior of supporting system, improper selection and design of supporting system of elevated water tanks. This paper presents the study of seismic performance of the elevated water tanks for various seismic zones of India with variation in staging heights and different types of staging configurations. Total 27 combinations were analyzed using Response Spectrum Method (RSM) in finite element based software SAP2000 by considering two mass idealization systems. Tank responses including base shear, overturning moment and roof displacement have been observed with the aim of recommendation of best staging arrangement for different earthquake zones in India.
INFLUENCE OF FRAME TYPE TAPERED STAGING ON SEISMIC BEHAVIOUR OF ELEVATED WATER TANK
Liquid storage tanks supported on staging are used widely for storing water. Staging is formed by a group of columns and horizontal braces provided at intermediate levels. The frame staging with a single row of columns placed straight (vertical) along the periphery of circle, are generally adopted for elevated water tanks to support the tank container. Apart from vertical column,tapered (inclined) columnsare also used to support the tank container.The aim of this paper is to study the seismic behaviour of elevated tank with frame type tapered staging under different time history records using FEM software SAP2000. Analysis follows the guideline for "Seismic Design ofliquid Storage Tanks" provided by the Gujarat State Disaster ManagementAuthorityand Preliminary Draft of IS: 11682 "Criteria for Design of RCC Staging for Overhead Water Tanks". The study have been assess, the behavior of staging considering quantities like, base shear, overturning momentand tank displacement which is highly affected under various degree of tapering, filled up conditions as well as diflerent characteristic of earthquake.
Performance of Overhead Water Tank with Staging under Seismic Conditions-A Review
IRJET, 2023
Water is an important source hence water tank storage tanks also play a vital role. Earthquake is a major natural calamity all over the world, during earthquakes there are effects on water tank so designing and analyzing them plays a vital role nowadays. In this paper seismic analysis of a water tank is done considering many parameters such as base shear, base moment, displacement, overturning moment, axial force, story drift with capacity of tank, types of tank and IS code, different staging patterns for various soil condition and various bracing patterns studied. The water tank analysis can be done with three conditions such as partial, empty, and filled condition.
Seismic Response of RC Elevated Water Tank with Different Types of Staging Pattern
— Elevated water tanks are one of the main lifeline elements and are considered as the structures of high importance. It has large mass concentrated at the top of slender supporting structure hence extremely vulnerable under lateral forces due to earthquake, their serviceability performance during and after strong earthquakes is a matter of concern. The present work aims at checking the adequacy of water tank for the seismic excitations and to understand the behavior of supporting system which is more effective under an earthquake record for seismic zone IV. Different types of staging patterns with varying heights and cross sections are analyzed by using Non Linear Dynamic Time History analysis using E-tabs 2016 software. study is extended for different staging patterns i.e. Hexagonal and cross bracing, Square and radial bracing for staging height 16m and square column.
Study of Seismic Analysis of Non-Conventional Shapes of Elevated Water Tank
International Journal for Research in Applied Science and Engineering Technology IJRASET, 2020
Any design of Water Tanks is subjected to Dead Load + Live Load and Wind Load or Seismic Load as per IS codes of Practices. But in past issues maximum water tank damages occur due to the earth quakes. So the seismic analysis of water tank is important as well as wind analysis. The reason for damage of the water tank is due to lack of knowledge about staging or bracing part of the tank which play important part during earth quake. Non-conventional shapes taken for design such as conical with shaft supported, etc. from them select the best water tank for construction with the reference of design parameters So the elevated water tank is analyzed for all seismic zones as per IS: 1893, analysis has been done using STAAD. Pro software and it is checked manually also. The rectangular shape of water tank is general shape and other designed water tanks are compare with rectangle one. In the design seismic forces are calculated considering zone IV.
SEISMIC BEHAVIOR OF ELEVATED WATER TANK
Hydrodynamic analysis of elevated water tank is a complex procedure involving fluid structure interaction. The elevated tank supports large water mass at the top of slender staging. In case of elevated tank the resistance against lateral forces exerted by earthquake is largely dependent of supporting system. Staging is considered to be a critical element as far as lateral resistance is concern. Satisfactory performance of staging during strong ground shaking is crucial. In this paper seismic behavior of elevated water tank in view point of their supporting system is evaluated using finite element software ETABS. The main objective is to evaluate a performance of different staging system for elevated water tank using finite element software ETABS. The spring mass model consisting of impulsive and convective masses as per IS 1893:2002 Part 2 has been used for the analysis. The parametric study is performed on mathematical model with different staging system to evaluate their performance with regard to lateral stiffness, displacement, time period, seismic base shear, overturning moment, flexure etc.
A STUDY ON THE SEISMIC RESPONSE OF ELEVATED WATER TANK
IRJET, 2022
Water tanks have been the most vital lifeline structures. They serve as an essential component for most water supply schemes in urban and rural areas. Water storage is generally based on overhead water tanks since the required pressure in the water delivery process is achieved by gravity in elevated tanks rather than the need for large pumping systems. These elevated tanks consist of a large water mass at the top supported by a tall staging which is extremely weak against horizontal forces caused due to earthquakes. The selection of a suitable staging system plays a major role in the behaviour of elevated water tanks during earthquakes since these tanks are often utilized in seismically active regions. The ductility and energy absorbing capacity of such elevated tanks are less compared to conventional building and hence seismic safety of such structures are very important. Soil-structure interaction (SSI) is one of the most essential components of structural analysis. This interaction can change the Dynamic characteristics of a structure, which can be advantageous or detrimental to its performance. Conventional fixed base analysis disregards the effect of soil flexibility, resulting in an unsafe design. The present work is focused on the study of seismic response of elevated water tank considering the sloshing effect and to evaluate the behaviour considering Soil-Structure Interaction (SSI) effect in seismic Zone (II and III). Different soil conditions are also adopted as per IS1893(Part 2):2014. Modelling and analysis has been carried out using FEM based software SAP2000.
Seismic Analysis and Optimization of RC Elevated Water Tank Using Various Staging Patterns
As known from very upsetting experiences, poorly designed elevated water tanks were heavily damaged or collapsed during earthquakes. This might be due to the lack of knowledge regarding the behaviour of supporting system of the tank, and also due to improper selection of geometry of staging patterns. For certain proportions of the tank and the structure, the sloshing of the water during earthquake may be one of the dominant factors.Dynamic analysis of tank containing liquid is complex involving fluid-structure interaction.In this paper, the seismic behavioural effect of circular elevated water tank is studied for specific capacity of tank for various staging arrangements in plan, variation in number of periphery columns and variation in number of stages in elevation. Two mass idealizations suggested by Gujarat State Disaster Management Authority are considered here. Under earthquake loads; a complicated pattern of stresses is generated in the tanks. Total 36 combinations were analysedwith SAP2000 using Response Spectrum Method (RSM) and results are presented. It is observed that increase in number of columns, does not assure the increase in the improvement of structural responses. Radial arrangement with six staging levels is found to be best for the number of columns used. To suggest number of columns with suitable diameter cost optimization is done for the radial staging arrangement with six staging levels consideringcritical direction of seismic force, quantity of concrete and steel required. It is found that eight numbers of columns gives less cost as compared to six, ten and twelve with optimized diameter of 300mm.
IRJET, 2020
Fluid-structure interaction is one of the most perplexing phenomenon in dynamic analysis of elevated water tank. Earthquakes are one of the major natural calamities which have a potential to stop the normal going life of human by causing damage to infrastructure and lifeline facilities. Elevated water tanks should not collapse even after the earthquake since they are essential for supplying drinking water and quenching fires. Earthquake is the major natural phenomenon which can cause harm to human life directly disturbing the infrastructure and necessary facilities around us. From the past experience of few earthquakes occurred, during earthquake it is observed that the elevated storage reservoirs were collapsed or damaged and this might have occurred due to various reasons like lack of understanding the behavior of the supporting structure (staging) of the reservoir due to seismic loading or selection of improper geometric shape of the staging structure. Framed staging pattern is widely used for the elevated storage reservoir. In this study, an attempt has been made to study the behavior of the reinforced concrete elevated storage reservoir with different horizontal bracing patterns under seismic conditions. The analysis of elevated water tank is carried out in STAAD PRO.