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Large concrete gravity dams are normally designed for seismic combination of 100% horizontal component (H) with 0% vertical component (V). This research provides the guidelines for use of realistic seismic load combinations in the design of large concrete dams. The current study involves the impact of variation of seismic parameters on the base width of the dam. In addition to 100% H with 0% V, 100% H with 30% V and 100% H with 67% V and vice versa of all three (03) combinations are also considered. Total six (06) seismic load combinations have been considered to analyse the dam body using rigid body analysis approach using CADAM software. Three (03) dam base widths are studied for six (06) horizontal and vertical seismic combinations. The analysis results showed that increase in dam base width of 20m (Study-I) was okay for seismic combination EQ-(1,2 & 3,4) by taking some extra measures. Increase in dam base width of 30m (Study-II) was okay for seismic combination EQ-(1,2 & 3,4) without taking any extra measures. Whereas, increase in dam base width of 40m (Study-III) was okay for all seismic combinations EQ-(1,2, 3,4, 5,6).

IMPACT OF VARIATION IN SEISMIC PARAMETERS ON THE BASE WIDTH OF DAM BODY