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BAZ

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BAZ last won the day on October 24

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About BAZ

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    Rawalpindi
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    NUST, Politecnico Di torino
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    CIIT
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    structural engineering,cricket,football,economics and films/music.

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  1. load modeling

    Sorry, I m not sure what you meant. You don't need to include a member in the model just to add its load. You need to model only those members that are essential for completing the load path (structural members).
  2. Plate connection in compression and bending

    Looking at the figure, one cannot figure out the complete load path for a particular loading scenario. So, it is not possible to give a specific advice. But, the way these pipes are connected, there be moment due to the eccentricity of connections in addition to axial forces. In addition to axial and flexural stress, shear stresses can also dictate the thickness required for the pipe, if the load path includes these forces.
  3. hi all

    i have A question -please

    Can I model the load of partion load(brick wall load) by modeling a beam with very small dimensions such as 1 cm * cm

    and apply load on it (the small dimension beam).

     

    1. BAZ

      BAZ

      Sorry, I am not sure what you meant.

  4. For local behavior, the beam should do just fine.
  5. Stiffness Modifiers

    The beam is a flexural member, and the column is an axial+flexural member. So, the beam will experience more cracking than columns. These numbers are deduced from experimental results ( read the commentary of ACI section 10.10.4.1).
  6. Material behavior can be idealized as consisting of an 'elastic' domain and a 'plastic' domain. For almost 200 years, structural design has been based on an elastic theory which assumes that structures display a linear response throughout their loading history, ignoring the post-yielding stage of behavior. Current design practice for reinforced concrete structures is a curious blend of elastic analysis to compute forces and moments, plasticity theory to proportion cross-sections for the moment and axial, load, and empirical mumbo-jumbo to proportion members for shear. From the book "Design of Concrete Structures with Stress Fields" by A. Muttoni, J. Schwartz and B.Thurliman.
  7. Thickness of footing

    Draw the shear force diagram for one way shear. Calculate the design bearing pressure for determining the demand for resistance against punching.
  8. Shear wall from 3rd storey

    The demand on the horizontal and vertical members that will transfer the forces of a wall to the foundation is a major concern. The demand will be calculated by considering the expected ductility and overstrength of the wall.
  9. Flange brace design

    Consult the document titled BRACING FOR STABILITY. Bracing is a function of the compressive strength of compression flange. As a rule of thumb, bracing force can be considered as 2-3% of the coompressive strength of the compression flange of beam. Read the document for better estimate.
  10. Seismic Analysis

    The time history is the most accurate way to estimate the demand as well as detect the shortcoming in a structure. It is time-consuming and most design offices do not use it unless they have specifically charged from the client for such analysis. If your building is regular, response spectrum will suffice; you can check modal mass participation to verify that. If you are getting more than 60% mass in principle modes, then time history will not offer a significant advantage.
  11. Seismic Analysis

    You will use Time history analysis when you want the analysis done in highest possible detail. Yes, it will depend on the building height, as well as on the structural irregularities. For regular structures less than 20 stories, pushover analysis will do. But if you want to consider the effect of higher in modes even in buildings less than 20 stories, you should go for Time history analysis.
  12. Shear capacity of Column

    Study section 11.2.1.2 of ACI 318-11. The relation you have mentioned above does not include the effect of axial forces.
  13. ETABS reports the depth of neutral axis, as well as the required length of boundary element.
  14. 6-ft Mass Concrete

    Yes, Errect formwork, place and hold reinforcement and pour concrete in shifts.
  15. You can also get help from: Reinforced concrete design, 6th Ed., by Mac Gregor and James K Wright and Seismic Design of Reinforced Concrete and Masonry buildings by Paulay & Priestely.
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