**Section Properties**

Section
properties are calculated separately for the concrete, reinforcing and steel
and then combined using the modular ratio to calculate the transformed section
properties. The steps involved in this
calculation are outlined below.

1.
Calculate
limits of concrete and steel sections (extreme tension fiber)

2.
Calculate
concrete section properties

3.
Calculate
reinforcing section properties, including distance to extreme tension rebar
(ym).

4.
Calculate
steel section properties. Note that these properties should correctly account
for the thickness of the shapes.

5.
Calculate
transformed section properties using a modular ratio of Es/Ec (not rounded).

6.
Calculate
balanced steel distance Xbal for reinforcing and steel shape and use the
smaller value.

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(For variables, see Design
Criteria section)