EFFECTIVENESS OF USE OF SPECIAL SHAPED BEAMS & COLUMS IN ELONGATING THE FUNDAMENTAL TIME PERIOD TO IMPROVE THE RESPONSE OF R.C. STRUCTURES

In Structural dynamics, every structure has a fundamental time period and a frequency, longer the time period, lesser the frequency making the structure flexible. As the structures with long periods are very flexible they do not excite during earthquakes as much as the structures with shorter periods excites. In this study it was objected to elongate the fundamental time period of reinforced concrete structures so as to make it flexible/ductile and improve the response of the structure. Special shape of cross sections of columns and beams has been analyzed. The Special shape being T-shaped and + shaped columns whereas the beams with trapezoidal ends and rectangular mid span. Time History Analysis of various models have been done for ground motions of Imperial Valley Earthquake. The elongation of fundamental time period and decreased base shear was seen for the special shaped beams and columns.