Skip to main content
Bryan Stanley
Design Engineering
Asked a question last year

Why a Continuous RCC beam should be designed as a Tee beam for Span moments and as a Rectangular Beam for Support Moments?

Why a Continuous RCC beam should be designed as a Tee beam for Span moments and as a Rectangular Beam for Support Moments?

Where am I?

In TheConstructor you can ask and answer questions and share your experience with others!

Seth Morgan
Construction Superintendent

In the regions of a positive moment, a portion of the slab works with the beam (both under compression force), so that part should be included in the beam design. However, negative moments develop cracks at the upper part of the beam. So, the cracked part of the concrete section is neglected in the design, and the lower portion is in compression which is rectangular.

Bcz , there is a negative moment above the supports.Making it useless and only left is rectangular portion at the bottom, so that's why rectangular beams are used for support moments in continous beams.

While in the span case, the top section is under compression and below one is in tension so the flexural strength is enough to contribute to resist the stresses.

Related Questions