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As recommended in the ACI 435R95 report, CSI Software has reduced the default modulus-of-rupture value from 7.5√f'c to 4√f'c. This change has been documented as Incident # 19168 in the CSI Release Notes.

Through manual overwrite, users are welcome to comply with the previous 7.5√f'c value, or apply another value based on engineering judgment or project requirements. This is done using the ‘User Specified’ ‘Cracking Modulus of Rupture’ option under the ‘Run’ > ‘Cracking Analysis’ menu, as shown in Figure 1:


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Figure 1 - Overwrite modulus of rupture


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