RCC column design

Dear sir,

What does it mean when the out put of staad for column design says that " The number of iterations exceeded 500" ?

regards

ramakumar

Parents Reply
  • In STAAD for column design as per IS:456 code, the location of neutral axis is determined. It follows the first principle. The process is a iterative one. The maximum nos. of iteration set for the process 500. So for his case the program fails to find out the neutral axis of the column section provided. You may either change the section size of increase the default Max. % of reinforcement by using RRATIO parameter(which is set to 4%). It should be noted that it has been a common practice for the design engineer to go for maximum of 4% steel to facilitate the proper bonding between steel and concrete. So increasing the maximum of % steel would not be a good idea.



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