What is sagging and hogging bending moment
What is sagging and hogging
● introduction :- let us discuss about very important topic what is sagging and hogging bending moment in beam. You know that there is many types of beam like cantilever beam and simply supported beam so more type —-. cantilever beem have only one side is supported by column and second end is free. And in simply supported beam both sides are supported with column. When load is transfer by slab on beam , it will experience positive and negative bending moment that will be represented by sagging and hogging of beam.
● sagging in simply supported beam
We know that simply supported beam is supported at both end by column when load is applied on Beem it will experience positive bending moment and bend in concave face structure in downward direction. In concave face there is three layer middle one is neutral layer, below middle layer there is tension layer and upper of neutral layer is compression layer. Maximum tension layer denoted by yt and neutral layer denoted by yn and compression layer denoted by yc.
● hogging in cantilever beam
We know that cantilever beam is supported by only one end by column and second end is free, when load is applied on cantilever beam it will experience negative bending moment and band in convex face structure in upward direction. Top of convex face is in maximum tension and below face in maximum compression and there is a neutral layer between maximum tension layer and maximum compression layer. It will bend in anticlockwise direction in right hand side of beam and it will bend in clockwise direction in left hand side of beam.that is hogging of beam.
You should also visits:-
● both sagging and hogging bending moment in beam create maximum tension in beam and slab that’s leads to create failure of structure ,for Counter this we should use good quality of reinforcement containing main bar distribution bar and crank in beam and slab.