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  1. readethis

    HDD Reference Materials?

    Can anyone steer me towards some good reference/engineering design manuals covering the topic of Horizontal Directional Drilling? I am currently trying to design for a Highway crossing and I am new to the HDD environment. Thanks
  2. readethis

    Seismic Analysis - Why use 2/3 Horizontal value for the Vertical Value

    I was once told by a Structural Engineer that when evaluating for Seismic loading, the load combination for Seismic should include 2/3 Horizontal value for the Vertical Shear and 100% Horizontal Shear. However, I have not been able to justify the reasoning behind this rule of thumb. Can anyone...

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