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  1. azureblue83

    Sequential Construction

    The attached picture is from ETABS video regarding sequential construction modeling: https://www.youtube.com/watch?v=oi2rdht_pZY The left and right images are identical (same structural members and loads), except that the left image is considering the entire structural as a whole; while the...
  2. azureblue83

    CMU h/r ratio use r-net or r-avg?

    This should be a quick question for the experienced CMU forks. In ACI 530, par 3.3.4.1.1, to determine the axial strength, we need the h/r ratio. I tho the r should be the r-net, because usually net sectional properties are used for stress/strain computation, while average sectional properties...
  3. azureblue83

    How to Enage This Moment Frame to Resist Lateral Load?

    Doing a building extension design for a 4-story building (40ft/12.2m height). Existing structural is a closed CMU building 33ft x 20ft (10m x 6m) dimension. Extension is to be done by knocking down one side of the CMU wall and extend into the back yard for 14ft (4.3m). A steel moment frame is...
  4. azureblue83

    Confusion Regarding the Dead Load in ASCE Load Combination 5 and 7

    Load Combination 5 and 7: 1.2D+1.0E+L+0.2S 0.9D+1.0E where D is defined as simply "dead load" and E = earthquake load, calculated as following: E = Eh +- Ev = pQE +- 0.2SDSD where QE is the effect of horizontal seismic effect, and 0.2SDSD is the vertical seismic effect. Now, suppose designing a...
  5. azureblue83

    Masonry Building Shear Wall Load Transfer

    Hello. Many masonry buildings in big cities, such as New York, are narrow rectangular shape. The interior floor joists/beams typically runs along the short direction, supported by the wall. So, the long direction wall is a bearing wall + shear wall, while the short direction wall is none load...
  6. azureblue83

    Connection between Column and Base Plate

    Designing the connection between the column and the base plate. The column is modeled as pin connected at the base. The column is designed for primarily gravity load, but need to resist some shear due to lateral loads. There are a lot of design guides out there about how to design the base...
  7. azureblue83

    Beam-Column's Axial Capacity Affected by Shear Connection?

    Designing a T beam subject to flexural load and very small axial compression load. I calculated the axial capacity of the beam as a whole T beam according to AISC Spec and it's much larger than the load (28kips > 1kip factored load). But then I'm worried because the beam is connected thru web...

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