I am designing a Tapred section as per IS 800:2007 LSD, By considering LTB. When I do it manually, the Moment capacity of beam is 772.8 kNm as per Cl 8.2.2

Question

My Section size is 175 x 8 Flange and 1000 x 10 Web of Fy= 345 Mpa. 
 The unsupported length about x and y is 1.5m. Lz is 25m. 
 Capacity as per STAAD is 953.62 kNm doesnt match with manual value. 
 But STAAD Output report, the value is 953.623 kNm which is laterally supported beam capacity as per Cl 8.2.1.2. Is this issue with Current update 6?

Abhisek M · Answer

We have kept some verification example in the help file. You may refer those for clarification. 
 file:///C:/Program%20Files/Bentley/Engineering/STAAD.Pro%20CONNECT%20Edition/Help/GUID-E6604057-DD21-4779-8428-A08817A6ECA2.html 
 If you still have doubts, please upload the STAAD model along with your hand calculation for investigation at our end.