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  1. JDBolt

    LRFD vs. Standard Spec

    Another thought: Suspect 30 105 30 span arrangement is causing the negative moments over the interior supports to approach that of a fix end moment condition. You can study this behavior by increasing the first and last span and notice the moments at the interior support will decrease. A...
  2. JDBolt

    LRFD vs. Standard Spec

    Some thoughts: Studies found the effects of the exclusion vehicles under estimated negative moments by by up to 80%. {AASHTO fig.C3.6.1.2.1-1. The effect of two trucks for negative moments may be reduced by 90%. [AASHTO 3.6.1.3.1]. The 50 feet spacing refered to is a minimum, and a greater...
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