## Friday, January 11, 2013

### Rectangular and tee-beam Continuous Strips.

Introduction
Rectangular beam strips are brieﬂy discussed previously and the inverted  T-beam strip in section 9.3.7 where it is mentioned that the main difference in the two beam foundations relates to the relationship between the width of beam required to resist bending moments and shear forces and that required to achieve the allowable bearing pressures.

If the two widths are similar then the rectangular beam tends to be economic. However, on relatively poor-quality sub-strata the beam width required to achieve the allowable bearing pressures often far exceeds that required for bending and shear resistance. In the latter case it tends to prove economic to reduce the beam width and spread the load through a ﬂange slab on the sofﬁt of the beam.

1 Design decisions   The economic design of continuous beam strips can be greatly affected by the choice of curtailment of the lengths of beams. They are generally used where longitudinal...

2 Sizing of the design   The sizing of the rectangular beam is similar to the sizing of the upstand beam of the inverted T, i.e. based mainly upon bending moments and shear forces. However, the beam width...