Thursday, July 6, 2017

Design and development of shake table - Civil Engineering project

Explore earthquake hazards and damage to buildings by constructing model buildings and subjecting the buildings to ground vibration (shaking similar to earthquake vibrations) on a small shake table. CIVIL constructions and engineering structures are designed to withstand a variety of operational loads and environ-mental conditions over decades of safe and economic usage. Earthquakes are part of this environment. Apart from destruction of life and property, they can have serious indirect consequences.

The exact simulation of earthquake motion has been a serious challenge to researchers and engineers. Shake table testing is being increasingly used in earthquake engineering research centers worldwide, as it is the only available means of nearly truly reproducing the dynamic effects that earthquakes impose on structures. A relatively simple system has been assembled with care to ensure an adequate replication of input motion by the shake table system. Subjective comparisons of input signal vs shake-table response, in both time and frequency domain have been utilized to provide a measure of the capabilities of the simulator to reproduce earthquake motions scaled according to similitude laws. This report discusses briefly various components of the shake table, its assembly and the investigations that were carried out to provide specific insights into its response characteristics.

A structure in the vicinity of an earthquake will experience random vibrations caused by the movement of its foundation. One may assume similar response if the base of the structure is shaken in a laboratory environment using the acceleration – time history recorded during the earthquake. By the same token, laboratory reproduction of associated displacement – time history would also have the same effect. This is the basis for the application of two-axis shake table to earthquake simulation.

Designing of a shaking table which produces vibrations in horizontal as well as in vertical direction. This is used for the analysis of the vibrations in a structure at the time of earthquake. Architects and engineers run simulations using models and shake tables to test the integrity of buildings and determine necessary reinforcements and to study dynamic structural behavior.

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