Seismic Analysis of RCC Branching or Inclined Column Frame for Institutional Building

Abstract

Seismic Analysis of RCC Branching or Inclined Column Frame for Institutional Building

Institutional building requires column free large span open spaces for various functional purposes and requires expansion due to increased demand. Due to urbanization, it becomes very difficult for extension of existing structures within the city. Investing in new property will be uneconomical, in such scenario it becomes important to creatively combine requirement of small area for class room, large span area for sports recreation purpose within one multi storey structure. In traditional design such structures would be designed as floating column with transfer girders, as per the latest revision of IS1893 (part 1) 2016 clause 7.1 regular and irregular configurations of buildings Table 6 sl no vi) it is advisable to prohibit floating columns as it is likely to cause concentrated damage.  In this paper considered an institutional building located in Bangalore multipurpose hall at ground floor requires column free space of 25.5m (clear space column to column) and the structure above for classrooms, seminal halls admin, staff room etc. can have column to column spacing of 10.65m. This is to be constructed within the existing campus. To design the structure as per requirement of both architectural and structural point of view the column needs to be branched to ensure smooth transfer of load and no concentrated damage is caused without violating the IS code. The column is branching at ground floor slab level, since the column is inclined and load from the branching column will exert tension on the ground floor level PT beam is provided.