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Methods Of Earthquake Essay

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3. METHODS FOR ANAYLSIS
3.1 IS 1893 (Part 1): 2002
Earthquake and its occurrence and measurements, its vibration effect and structural response have been continuously studied for many years in earthquake history. Since then the structural engineers have tried hard to examine the procedure, with an aim to counter the complex dynamic effect of seismically induced forces in structures, for designing of earthquake resistant structures in a refined and easy manner. This re-examination and continuous effort has resulted in several revisions of Indian Standard: IS 1893: (1962, 1966, 1970, 1975, 1984, and 2002) code of practice on the “Criteria for Earthquake Resistant Design of structures” by the Bureau of Indian Standards (BIS), New Delhi. It was adopted after the draft finalized by the Earthquake Engineering Sectional Committee had been approved by the Civil Engineering Division Council. Main features of seismic method of analysis based on Indian Standard IS 1893 (Part 1):2002 are as follows:
There are two methods of analysis for determining earthquake effects on …show more content…

This is required in many building codes for all except for very simple or very complex structures. The response of a structure can be defined as a combination of many special shapes (modes) that in a vibrating string correspond to the "harmonics". In this method the response of Multi-Degree-of-Freedom (MDOF) system is expressed as the superposition if modal response, each modal response being determined from the spectral analysis of Single-Degree-of-Freedom (SDOF) system, which are then combined to compute the total response. Computer analysis can be used to determine these modes for a structure. For each mode, a response is read from the design spectrum, based on the modal frequency and the modal mass, and they are then combined to provide an estimate of the total response of the

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