A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Shear Nonsense
The ACI Code procedure for shear design of prestressed concrete beams has remained substantially unchanged for more than 45 years since it was introduced in the 1963 and 1971 Codes. The 1963 Commentary to Section 2610 states: These provisions are based upon a critical appraisal of 244 bonded prestressed beams which failed in shear, including both monolithic and composite sections up to 39 in. in width and 25-1/2 in. in depth. In practice and in teaching prestressed concrete for many years at the university level, we have identified a number of anomalies in this ACI Code shear design procedure, most particularly in beams with both positive and negative moments. That would include most post-tensioned beams, the vast majority of which are multi-span and/or built monolithically with their supports. For that reason, the balance of this article will focus only on the shear design of post-tensioned concrete beams.
Shear Nonsense
The ACI Code procedure for shear design of prestressed concrete beams has remained substantially unchanged for more than 45 years since it was introduced in the 1963 and 1971 Codes. The 1963 Commentary to Section 2610 states: These provisions are based upon a critical appraisal of 244 bonded prestressed beams which failed in shear, including both monolithic and composite sections up to 39 in. in width and 25-1/2 in. in depth. In practice and in teaching prestressed concrete for many years at the university level, we have identified a number of anomalies in this ACI Code shear design procedure, most particularly in beams with both positive and negative moments. That would include most post-tensioned beams, the vast majority of which are multi-span and/or built monolithically with their supports. For that reason, the balance of this article will focus only on the shear design of post-tensioned concrete beams.
Shear Nonsense
K Dirk Bondy (author) / Kenneth B Bondy
2016
Article (Journal)
English
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