International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
SEISMIC RESPONSE OF MULTI-STORIED BUILDINGS WITH DIFFERENT VIBRATION CONTROL TECHNIQUES-A REVIEW Aswini A R1,Jayalekshmi R2 1PG
Student, Department of Civil Engineering, NSS College of Engineering, Palakkad, India Department of Civil Engineering, NSS College of Engineering, Palakkad, India
2Professor,
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Abstract - Structural vibration control has become a
workable technology to protect infrastructure against wind and earthquake loads. Earthquake is the frequently occurring vibration of earth surface which results in damaging of structures and causes loss of lives. Performance-based seismic design has brought about new technological advances and introduced innovative approaches to constructing seismicresistant buildings. To minimize the damage due to earthquake on the structures active and passive vibration control methods are there. Different passive vibration control methods adopted in practice are reviewed in this paper. Buildings with base isolators, with shear walls and tunnel form type buildings are considered.
Key Words: Vibration control, base isolator, shear wall, tunnel form type buildings. 1. INTRODUCTION
Most of the world’s population lives in seismic hazardous regions. Earthquakes are shaking of ground which is caused by rapid release of strain energy stored in the earth’s crust. Earthquakes are the natural calamity which causes immense damages to the man-made structures on the earth and also causes a great loss of life. Multi-storeyed buildings, if not designed properly for lateral forces, may lead to complete collapse and hence loss of property and life. When an earthquake strikes, the structure moves laterally and vertically caused by the surface ground motion induced by the seismic waves. Typically the lateral motion is much greater than the vertical motion. The mass, size and configuration of a building or a structure indicate how the structure will respond to an earthquake event. Any structure is to be designed to hold out against the lateral forces induced on to it by the earthquake ground motion. To achieve this, the lateral load resisting systems need to resist all these lateral forces coming on to the structure during an earthquake event. To perform well during an earthquake event, a building must have the four main hallmarks that are simple-regular configuration, proper lateral strength, stiffness and ductility.
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Impact Factor value: 5.181
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Conventional design approach is not applicable in situations when a structure must remain functional after earthquake .Over the past couple of decades the astounding developments in alternate design strategies have been made, which incorporate, earthquake protective systems in the structure. The vibration control techniques can be divided in to active and passive methods.This paper describes the passive vibration control methods attempted in buildings.
2. SEISMIC CONTROL METHODS The structural vibrations produced by earthquake or wind loads can be controlled by various fundamental means. These conceptual approaches include modifying damping, masses or shape, rigidities, and by providing passive or active counter forces. Some methods of structural control have been used successfully. In recent years, considerable attention has been paid to research and development of structural control systems. A large numbers of techniques have been tried to produce better control against wind and earthquake excitation. These can be classified into four broad categories: passive control, active control, semi-active control and hybrid control. Passive control system is one that does not require an external power source. All forces imposed by passive control devices develop as direct responses to the motion of the structure. Hence, sum of the energy of both the device and the primary system will be constant. Active control assures improved response to passive systems at the cost of energy and more complex systems. Active control system has been as any control system in which an external power source is required to provide additional forces to the structure in a prescribed manner, by the use of actuators. The signals are sent to control the actuators and determine the feedback from the sensors provided on or through the structure. Due to the presence of an external power source, the force applied may either add or dissipate energy from the structure. Semi active control performed on the benefits of active control and the reliability of passive control, which makes it a much more appealing alternative to traditional control scheme in civil structures. Semi active control systems act on the same principle of active control system but they differ in that their external energy requirement is smaller. Hybrid systems act on the combined use of passive and active control system. ISO 9001:2008 Certified Journal
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