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Recent content by optiengg

  1. optiengg

    Maximum possible two way slab spans and thickness

    The thickness of two way slab is dependent on its unsupported perimeter, so larger the perimeter, greater will be its thickness. For a 20 x 24 panel , it is about 6.5", but goes upto 9" for 25 x 35 panel. When should we consider subdividing slab panel (hence reducing slab thickness), by using...
  2. optiengg

    Eccentricity in columns supporting edge beams

    Let us say an edge beam is 9" wide, and supports a 4 1/2" wall.The beam has load P and moment M. Eccentricity on column due to beam load e = M / P. Now what about additional eccentricity on column due to loading. Is it distance between centre line of column and centre line of beam. Or between...
  3. optiengg

    Carrying out second order analysis with software

    I have used an old DOS based software strsolv for structural analysis. The program takes input for 3D frame, member inertias, loads, and various combinations of Dead, live and lateral loads. The program reports moments, shears, axial forces etc for all members, and can even give forces at...
  4. optiengg

    provision for future expansion in rcc frame structure

    I have a reinforced concrete frame structure with three bays, however, there is provision in plan for constructing further three bays in future. My approach is to construct three bays, leave about 3 inches (just like expansion joint) and construct the other three bay frame when needed. However...
  5. optiengg

    moment magnification for columns

    Should moment magnification be considered for sway frames, where the analysis has been made for various combinations of dead, live and earthquake loads. In such cases does it suffice to design column considering that it satisfies each and every loading combination, or do we still have to follow...
  6. optiengg

    Column k values in reinforced concrete frames

    How should column k value be calculated for lower storey column of a moment resisting frame. Since it will have no beams at its lower end. Another problem is how one decides if the frame is braced or side sway.
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