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What is
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the scale factor given in
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the IS:1893
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RSA-definition dialogue box?
A: It should be noted that the Answer: The spectrum ordinates defined using in-built within various code options, including IS:1893 code option as well as other code options are normalised values. It means that these are without any units. These are the values of spectral accelerations divided by acceleration due to gravity. So the , are normalized values in which spectral accelerations are divided by gravity acceleration. The spectrum must be converted to a the specific set of units which are used in throughout the model . This is done by using applying a scale factor with a given as the value of gravity acceleration due to gravity in the current units of your model. At the same time it must be noted
Note that the design spectrum of IS:1893 is actually the MCE-level spectrum and it which must be reduced by dividing it this value by a factor of 2R where , in which R is the response reduction factor. So in In the first run, the value of the scale factor should be SF = I*g/(2R) where , in which I is the importance factor. After the first run, check the base shear developing which develops in the model, and if the computed this value of base shear is less than the code specified minimum base shear than enhance the value of scale factor used in -prescribed minimum, then increase the scale factor of the first run so such that resulting the resultant base shear would match with matches the code specified minimum valuespecification.