Design aid for seismic strengthening of reinforced concrete beams

摘要

Design for seismic strengthening of the existing doubly beam involves - analysis of the existing beam for assessing its current strength, and based on the current seismic demand posed on it, redesigning the beam for the required additional strength. In practice this is considered as lengthy, as procedure of iteration is mandatory in calculation of the ultimate moment capacity of doubly beam having arbitrary combinations of areas of compression and tension steel. The seismic strengthening of the existing non-seismic buildings is a vital need of time, given such cases are more in numbers so as its inhabitants. To facilitate these seismic strengthening formulations, analysis cum design aids for beams are presented in this paper and their use is demonstrated by means of an illustrative example which can fulfil the vital need of time. This will help to quickly identify the amount of steel (i.e. longitudinal and transverse) required for posed seismic demand on the RC beam member.