For interior girder shear distribution factors, the lever rule is recommended for structure types not found in table 188.8.131.52.3a-1 (see LRFD section 184.108.40.206.3a). Similarly, for exterior girder shear distribution factors, the lever rule is recommended for cases not addressed in Tables 220.127.116.11.3a-1 and 18.104.22.168.3b-1. However, sections 22.214.171.124.2b and 126.96.36.199.2d, which pertain to flexural moment distribution factors for interior/exterior girders, do not recommend the use of the lever rule for cases not found in the applicable tables. Is there any reason that these LRFD sections do not explicitly permit the use of the lever rule to obtain flexural moment distribution factors?
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