Dam structure constructed to save water has failed with resulting lack of lifestyles, social, economic and environmental losses because of seismic vibrations. those vibrations are dynamic in nature. those vibrations have to be reduced with proper application of engineering standards and for estimating the conduct of concrete gravity dam dynamic analysis plays an notable position. This paper gives the dynamic time history evaluation and response spectrum technique of a concrete gravity dam by the usage of STAAD-pro. right here Finite detail method is used to analyze the dam. A concrete gravity dam version is ready in STAAD-seasoned to perform the time records evaluation and reaction spectrum evaluation and a contrast is finished among each these strategies. Concrete gravity dam is a huge shape which keeps a totally large quantity of water on its upstream aspect and it’s far very crucial for a dam to continue to exist in opposition to vibrations of earthquake. So it is a depend of Dynamic Analysis observe to check the behaviour of a dam at some point of and after the software of the loading.
Dams have contributed to the development of civilization for a long time. they may retain to keep their importance in pleasant the ever growing call for for energy, irrigation and ingesting water, the protection of guy, assets and environment from catastrophic floods, and in regulating the float of rivers. Gravity dams are very popular in these days. The dam frame is designed in one of these manner that to resist water stress, silt pressure, uplift stress with weight of the dam [1] . There are several factors affecting the dynamic reaction of concrete gravity dams to earthquake ground motions. a number of them are the interplay of the dam with the inspiration rock and water in reservoir, sediment accrued at the lowest of reservoir, and non-linear conduct of dam concrete. STAAD-pro is on the whole designed to provide help for learning the principles of structural stability assessment of gravity dams. it may additionally be used for studies and improvement on balance of gravity dams. In adopting several global posted dam protection guidelines, a massive number of modelling options had been applied concerning (a) crack initiation and propagation, (b) outcomes of drainage and cracking underneath static, seismic, and post-seismic uplift pressure situations, and (c) protection evaluation codecs [2] . The simple objective of seismic design is to offer structures with appropriate safety Dynamic Analysis margins in opposition to failure whilst it’s miles subjected to sturdy earthquakes. within the finite element approach, the answer area is considered as constructed up of many small, interconnected sub areas called finite elements. because it is very hard to find the exact reaction of complicated structure beneath precise loading conditions, the structure is approximated as composed of several pieces within the finite element version [3] . Concrete dams are among high significance structures, regarding necessities for non-stop carrier all through their lifetime, and catastrophic outcomes in cases of possibly dam failure. therefore, the protection of those structures have to be investigated quite significantly by using logical and particular methods. With the development of information in earthquake engineering and the improvement of greater reliable techniques for estimating earthquake magnitudes at extraordinary sites, methods for the seismic analysis of systems are being developed that include the results of greater complicated parameters within the assessment and seismic risk analysis of structures.
the main objective of this paper is to have a look at the seismic behaviour of concrete gravity dam. in step with the Indian trendy code of practice dynamic analysis will be done for dam with top extra than one hundred m [4] . in this paper, dams of height below the a hundred m that is 70 m and 90 m and dam of peak above a hundred m this is one hundred ten m have been analyzed by the usage of the response spectrum and time records evaluation, based on IS codes and also to pass take a look at whether or not dynamic evaluation is essential or not for the dam of peak beneath one hundred m. And the outcomes received are in comparison finally to determine the structural overall performance of concrete gravity dam. response spectrum and time history evaluation play an incredible role. In Dynamic Analysis time records analysis time acceleration as an input facts with acceleration with respect to time. Time records evaluation offers the various mode shapes and path of structure which varies as in step with specific time-acceleration characteristic and these mode shapes varies as dynamic structural reaction underneath numerous loading. After the dynamic evaluation it may be without difficulty expected whether or not the structure will live on or now not beneath the effect of seismic vibration. The info of the examine and its result are described briefly in the following section of the paper.