Wk srm em scm

Peff J Es

asr is the stress calculated for the fully cracked cross section for the cracking moment. asr may be calculated by:

a _ fct,effActkck _ fct,effkck hcr (724)

Introducing the expression of asr into equation (7.23), and rearranging:

Peff

0,425k1k2

In order to obtain numerical values from this expression, it is necessary to assume values for those coefficients which are not considered as variables in table 7.2. The following values have been assumed to derive table 7.2: k _ 1,0 h < 0,3 (assumption on safe side) kc _ 0,4; k' _ 1 (pure bending)

With the above values equation (7.25) can be written as:

0 0

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