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Derive design stress block parameters for singly RC section for LSM of design.
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enter image description here

Now from strain diagram,

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aXu=0.0020.0035a=47Xu

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Area :-

  • Rectangle :

    =37Xu×0.446fckA1=0.191fckXu

  • Parabola :

    23×47×Xu×0.446fckA2=0.169fckXu

  • Y top

    37Xu×12=314Xu=314Xu+37Xu=914Xu

    A=0.191fckXu+0.169fckxuA=0.36fckXu

¯ytop=A1y1+A2y2A1+A2¯ytop=(0.1914×fckXu×314Xu)+(0.169×fck×Xu×914Xu)0.36fukXu¯y=0.42Xu

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