Infinity error is coming in the design.

Question

Dear Communities, 
 Greetings! 
 Find the attached updated model with a wide plate beam at a particular location (WPB 700x300x300.1 ). Also find the updated list of the section used in the model for your reference.

Note:- Please ignore the utilization ratio as 1.02, 1,05. 
 In this updated staad model there is not any overstressed member.

Modestas · Answer

In the Output file there are such warnings reported: 
 ***WARNING : MEMBER - 581 IS SLENDER AND CANNOT BE CHECKED FOR MOMENT FORCES. IF THERE IS ANY BENDING, THEN BE AWARE THAT THERE IS NO CAPACITY FOR THOSE FORCES. 
 As this warning tells, the program cannot design the slender sections, that is why the ratios of such members are reported as infinity. To get the design results, you would need to change the section size so that it would not be slender (i.e. change section SHS150X150X4 to SHS150X150X8).