M. Ilyas - Civil Engineering Department
M. Rizwan - University of Engineering & Technology, Lahore, Pakistan

Most of the seismically active regions of Pakistan fall under category of moderate seismic zones. The trend of construction of reinforced concrete multistory storey buildings has gained popularity verywhere in the world due to its weather resistant quality. The economy in design and desired performance of a multistory building under combined action of lateral force and gravity loads is obtained by carrying out redistribution of moments determined from analysis. The moment redistribution is carried out at the joints and it is difficult to include its variation along the span. In this paper a simple approach has been suggested to generate an approximate moment envelop for the redistribution of moments. For explanation of approach an illustrative model of a seven storey reinforced concrete building is selected and designed for seismic zone 2B. The model has no irregularities both in plan and elevation. Some suggestions and recommendations are drawn which can be considered/utilized for the design and construction of Reinforced Concrete Multistory Building Structures in moderate seismic zones.

concrete, buildings, moderate, redistribution, moment, envelop