plz give some introduction to seismic sensor..... ....etc

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Bridges are lifeline structures. They act, as an important page link in surface transportation network and failure of bridges during a seismic event will seriously hamper the relief and rehabilitation work. There are many cases of damage of bridges in the past earthquakes all over the world. Due to their structural simplicity, bridges are particularly vulnerable to damage and even collapse when subjected to earthquakes. The fundamental period of vibration of a majority of bridges is in the range of 0.2 to 1.2 second. In this range, the structur ....etc

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Bridges are lifeline structures. They act, as an important page link in surface transportation network and failure of bridges during a seismic event will seriously hamper the relief and rehabilitation work. There are many cases of damage of bridges in the past earthquakes all over the world. Due to their structural simplicity, bridges are particularly vulnerable to damage and even collapse when subjected to earthquakes. The fundamental period of vibration of a majority of bridges is in the range of 0.2 to 1.2 second. In this range, the structur ....etc

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SEISMIC SENSOR


D. MOHAN KUMAR



This circuit simulates a seismic sensor to detect vibrations/ sounds. It is very sensitive and can detect vibrations caused by the movement of animals or human beings. So it can be used to monitor protected areas to restrict entry of unwanted persons or animals. The circuit uses readily available components and the design is straightforward. A standard piezo sensor is used to detect vibrations/sounds due to pressure changes. The piezo element act ....etc

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Hi i am fathima ruksana i would like to get seminar report on seismic  behaviour of isolated bridges for the seminar presentation .... plz give me ....etc

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whole reports on seismic sensor ....etc

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Abstract:
In this seminar the analysis of soil-structure interaction effects and of multiple support excitation on the seismic response of long-span cable-supported bridges are presented. The purpose of this seminar is to provide a better understanding of the dynamic performance of cable supported bridges under earthquake excitation, considering the spatial variability of the ground motion and the complex phenomena of soil-bridge interaction, so that such effects can be included in the design and rehabilitation process. Amplification of struct ....etc

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Many structures have their fundamental frequencies of vibration within the range
of frequencies where the energy of most of the earthquake ground motions is a maximum. In such cases a structure will amplify the ground vibrations and produce accelerations, which increases from the base of the structure to its top. Besides producing undesirable levels of acceleration in the structure, these amplified structural motions can cause large stresses in structural elements and large relative displacements between different parts of the structure. This ....etc

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DESIGN AND IMPLEMENTATION OF SEISMIC SENSOR


INTRODUCTION
1.1 Overview
There are two basic types of seismic sensors: inertial seismometers which measure ground motion relative to an inertial reference (a suspended mass), and strainmeters or extensometers which measure the motion of one point of the ground relative to another. Since the motion of the ground relative to an inertial reference is in most cases much larger than the differential motion withi ....etc

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Many structures have their fundamental frequencies of vibration within the range
of frequencies where the energy of most of the earthquake ground motions is a maximum. In such cases a structure will amplify the ground vibrations and produce accelerations, which increases from the base of the structure to its top. Besides producing undesirable levels of acceleration in the structure, these amplified structural motions can cause large stresses in structural elements and large relative displacements between different parts of the structure. This ....etc

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