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Moment capacity using LFD and LRFD

Pradeepa Mayakrishnan — Mon, 10 Jul 2023 21:18:47 GMT

In LEAP Bridge, when comparing the results for Moment Capacity of prestressed beam using LFD and LRFD, the amount of prestressing strands contribute to the capacity for the former one is drastically reduced with latter one at the same location?.Why there is difference in As for the same location in both approach?

LFD

LRFD

Thank you.

Moment capacity hand caluclation

Pradeepa Mayakrishnan — Mon, 10 Jul 2023 19:39:12 GMT

Hi,

When trying to calculate the Moment capacity at Locations closer to the support region e.g.@H/2. How the area of prestressing strands are getting calculated, is this based on development length and effective prestressing force?. It is easy to understand that at mid section, Area of prestressing strands = (no.of.strands) x strand area.

Thank you.

Will the tensile rebar defined in the bottom of prestressed concrete beam contribute to the Shear capacity or not?

Pradeepa Mayakrishnan — Wed, 29 Mar 2023 22:06:52 GMT

As per AASHTO A.5.7.3.4.2, in the equation 5.7.3.4.2-4 calculation of net tensile strain in the section at the centroid of the tension reinforcement will account the amount of tensile rebar in addition to the prestressing tendons present in the beam. But in LEAP Bridge concrete, in the vertical shear result the amount of tensile rebar (As) are not taken into account in the eps-x value fig-1). Even though rebar is defined in fig-2)

Thank you

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Wed, 29 Mar 2023 20:57:04 GMT

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