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RCC column design

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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

  • Can you attach the STAAD file. You may have to zip the file before attaching

  • PLOT NO.46 (170409)-1.zip

    Mr. Nihesh.

    I am attaching the staad file as told you. I am using the staad pro version 20.07.03.16.

    The out put file for column design for some columns is saying" **** ITERATIONS EXCEED 500.
    WHILE CALCULATING COLUMN MOMENT CAPACITY.

    I would also like to know whether any report /data is available listing the errors,warning and the reasons for their occurance.

    regards

    ramakumar

  • 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.

  • Hi

    How a RCC Column subjected to Axial Tension plus biaxial bending moment is designed ? Is it the same way as for Axial Compression with biaxial bending moments.   ....Concrete portion is not working in tension case..    Please help me out.

     

    Bijay