1161 Words5 Pages

COMPARITIVE STUDY OF RESPONSE OF MULTI STOREY BUILDINGS SUBJECTED TO EARTHQUAKE FORCES WITH AND WITHOUT DAMPERS

D.V.BANGARA RAJU1, CHANDAN KUMAR.PATNAIKUNI2 1 D.V.Bangara Raju, M.tech student, Department of Civil Engineering, Gitam University, Andhra Pradesh, India

2 Chandan Kumar Patnaikuni , Assistant Professor, Department of Civil Engineering, Gitam University, Andhra Pradesh, India

Abstract

Dampers helps in reducing the vibrations caused by wind and earthquake. By using dampers we can improve the resistance of building towards the forces which are caused by earthquakes .In this study an attempt has been made to compare the results of equivalent static method and response spectrum method of seismic analysis for various models with*…show more content…*

Generally Equivalent static analysis is not adopted for high rise buildings. Practically it does not take into account all the factors that are importance of foundation condition. The equivalent static analysis is used to design small structures. In this method only one mode is considered for each direction. Earthquake resistant designing for low rise structures the equivalent static method is enough. Tall structures are needed more than two modes and mass weight of each story to design earthquake resistant loads. Equivalent static method is not suitable to design high rise structures and dynamic analysis method to be used for high rise*…show more content…*

displacement, velocity and acceleration as a function of natural vibration period or frequency and damping ratio of single degree of freedom system (SDOF).As the seismic forces strikes the foundation of structure it will move with the ground motion. It shows that movement of structure is generally more than the ground motion. The movement of structure depends on the natural frequency of vibration,. The revised IS 1893-2002 uses the dynamic analysis by response spectrum. In this method the most five important engineering properties of the structures i.e, the fundamental natural period of vibration of the building ( T in seconds), damping properties of the structure ,Type of foundation provided for the building , Importance factor of the building ,the ductility of the structure represented by response reduction factor are considered .

Many new techniques are found out for resisting earthquakes. One of the technique is Dampers. Dampers are used for vibration control of structure which are caused due to earthquakes and winds. Depending on type of material dampers are classified into different types and they are classified as Tuned Mass Dampers, Friction Dampers, Viscous Dampers, Metallic damper, Visco elastic dampers , Elasto plastic damper .Other techniques like base isolation are used for decrease of damage caused due to earthquake.

2. MODEL GEOMETRY The details

D.V.BANGARA RAJU1, CHANDAN KUMAR.PATNAIKUNI2 1 D.V.Bangara Raju, M.tech student, Department of Civil Engineering, Gitam University, Andhra Pradesh, India

2 Chandan Kumar Patnaikuni , Assistant Professor, Department of Civil Engineering, Gitam University, Andhra Pradesh, India

Abstract

Dampers helps in reducing the vibrations caused by wind and earthquake. By using dampers we can improve the resistance of building towards the forces which are caused by earthquakes .In this study an attempt has been made to compare the results of equivalent static method and response spectrum method of seismic analysis for various models with

Generally Equivalent static analysis is not adopted for high rise buildings. Practically it does not take into account all the factors that are importance of foundation condition. The equivalent static analysis is used to design small structures. In this method only one mode is considered for each direction. Earthquake resistant designing for low rise structures the equivalent static method is enough. Tall structures are needed more than two modes and mass weight of each story to design earthquake resistant loads. Equivalent static method is not suitable to design high rise structures and dynamic analysis method to be used for high rise

displacement, velocity and acceleration as a function of natural vibration period or frequency and damping ratio of single degree of freedom system (SDOF).As the seismic forces strikes the foundation of structure it will move with the ground motion. It shows that movement of structure is generally more than the ground motion. The movement of structure depends on the natural frequency of vibration,. The revised IS 1893-2002 uses the dynamic analysis by response spectrum. In this method the most five important engineering properties of the structures i.e, the fundamental natural period of vibration of the building ( T in seconds), damping properties of the structure ,Type of foundation provided for the building , Importance factor of the building ,the ductility of the structure represented by response reduction factor are considered .

Many new techniques are found out for resisting earthquakes. One of the technique is Dampers. Dampers are used for vibration control of structure which are caused due to earthquakes and winds. Depending on type of material dampers are classified into different types and they are classified as Tuned Mass Dampers, Friction Dampers, Viscous Dampers, Metallic damper, Visco elastic dampers , Elasto plastic damper .Other techniques like base isolation are used for decrease of damage caused due to earthquake.

2. MODEL GEOMETRY The details

Related

## Tall Building Essay

3171 Words | 13 PagesFederal Judicial Academy Phase-II, Islamabad Chapter-9 9.1 Introduction This theory aims to provide guidance and minimum standards for the designers of tall buildings in seismically active regions anywhere in the world. A tall building is defined here in as a building of sufficient height for the period of the first translational mode of vibration to exceed 4 seconds or for its height to exceed 50m. However, this can also be used to assess the performance of medium-rise buildings where this is needed. 9.2 Earthquake Earthquake is a shaking of the ground caused by the sudden breaking and shifting of large sections of Earth’s rocky outer shell. Earthquakes are among the most powerful events on earth, and their results can be terrifying.

## Pushover Analysis In Earthquake

1255 Words | 6 PagesNonlinear static procedures are now widely used in engineering practice to predict seismic demands in building structures. The simplified versions of NSP based on lateral load capacity such as those recommended in ATC-40 and FEMA-356 have well-documented limitations in terms of their inability to account for higher mode effects and modal variation resulting from inelastic behaviour. Results from the analytical study indicate that peak response measures such as inter-story drift and component plastic rotations more consistently than the other NSP’s investigated in the

## Seismic Facies Analysis

724 Words | 3 PagesSeismic facies analysis Seismic facies represent a group of seismic amplitude variations with characteristics that distinctly differ from those of other facies. A seismic facies is the manifestation of the underlying geologic facies or structural feature in the seismic amplitude data. These can be searched and identified from the seismic data by different approaches. These could be based on analysis of either the seismic waveforms or the seismic attributes. Seismic facies analysis consists of the parameters and reflection configuration studies, which determine a seismic sequence.

## Literature Review On Earthquake

2754 Words | 12 PagesThe taller the building is, the lower its natural frequency -code of earthquake resistant. 2.2.2.7 Mass distribution and concentration The distribution of the masses must be as uniform as possible, on each floor and height. It is desirable that the variation of the floor to floor mass accompanying the variation in stiffness. If the mass-stiffness varies sharply from one floor to another stress concentration occurs. Avoid superfluous presence of masses, such as excessive fillers on terraces, garden terraces, etc.

## Accelerometer Lab Report

930 Words | 4 PagesThe sensing element essentially is a proof mass (also known as seismic mass). The proof mass is attached to a spring of stiffness k which in turn connected to its casing. Further, a dash pot is also included in a system to provide desirable damping effect; otherwise system might oscillate at its natural frequency. When the system is subjected to linear acceleration, a force equaling to mass times the acceleration acts on the proof-mass. This causes the mass to deflect; the deflection is sensed by a suitable means and is converted into an equivalent electrical signal.

## Spb Lab Report

2690 Words | 11 PagesSplit Hopkinson pressure bar Aim and objectives of work Split Hopkinson pressure bar in most versatile apparatus for regulating the active behaviour of materials. To get a simple FEM of SHPB and numerical analysis was borne away in the present investigation and to simulate dynamic compression response based on quasi-static test to amount the mechanical response at high line rates and examine the dynamic compression properties, i.e. energy absorption and compressive force at advanced strain rates, to improve full scales stress-strain curves at altered strain rates and to examine the strain rate behaviour of differing materials. Modelling and test various geometries of specimens. Compare the experimental value with numerical test result values.

## Essay On Blocking Floor

856 Words | 4 PagesThis model is structured on the fact that in a model structure of a building, vibrations were produced artificially and the speed and velocity of these vibrations were measured for each floor at its center. The technique applied was that the thickness of the first floor was increased than the upper floor similarly the density or width of each floor was greater than its upper story. It has been observed that the materials like concreter and iron girders in the floor slabs behave as resistance to the propagating waves. This method of increasing the floor thickness is basically referred to as Blocking Floor.

## Seismic Forces In High Building

2414 Words | 10 PagesSeismic forces are always more at the base of the building. Simply we can say the seismic force at base of the building is called the base shear. In a multi-storey building all vibration modes of the building contribute to the base shear. Base shear is an estimate of the highest possible lateral force that will occur due to seismic ground motion at the base of a

## Pushover Analysis In Construction

864 Words | 4 Pages• S.P. Akshara (2015) The scope of the present study aims at evaluation of RC buildings designed according to IS 456:2000. The non-linear static pushover analysis procedure has been used in this regard The non-linear methods can give an Idea regarding the pattern of the plastic hinge formations and thus aid in the performance based seismic

## Earthquake Analysis Paper

1645 Words | 7 PagesREVIEW PAPER DESIGN AND ANALYSIS OF EARTHQUAKE RESISTANT STRUCTURE SHUBHAM VILAS DHINDALE Prof. S.K. HARINKHEDE T. E. Student, Associate Professor, Department Of Civil Engineering Department Of Civil Engineering Sinhgad Academy of Engineering, kondhwa Abstract - This paper deals with Seismic design and analysis Method like Seismic coefficient method. This paper involves the study of lateral forces calculated as per the provisions of IS 1893 1984 & IS 1893 -2002 Keyword – Seismic Coefficients, Base Shear, Earthquake analysis INTRODUCTION

### Tall Building Essay

3171 Words | 13 Pages### Pushover Analysis In Earthquake

1255 Words | 6 Pages### Seismic Facies Analysis

724 Words | 3 Pages### Literature Review On Earthquake

2754 Words | 12 Pages### Accelerometer Lab Report

930 Words | 4 Pages### Spb Lab Report

2690 Words | 11 Pages### Essay On Blocking Floor

856 Words | 4 Pages### Seismic Forces In High Building

2414 Words | 10 Pages### Pushover Analysis In Construction

864 Words | 4 Pages### Earthquake Analysis Paper

1645 Words | 7 Pages