Experimental study of moment redistribution in continuous concrete beams prestressed with unbonded tendons

Author:

Nakari Tarja1ORCID,Tulonen Joonas1ORCID,Asp Olli1ORCID,Kytölä Ulla1ORCID,Laaksonen Anssi1ORCID

Affiliation:

1. Faculty of Built Environment—Concrete and Bridge Structures Tampere University Tampere Finland

Abstract

AbstractThe moment redistribution in a continuous prestressed concrete beam occurs as a result of a change in the rigidity of a beam and formation of plastic hinges when approaching the failure. Rotation capacity is required to allow for moment redistribution. Four continuous two‐span concrete beams prestressed with unbonded tendons were built and loaded up to failure at the laboratory of Civil Engineering in Tampere University. The test beams had different reinforcement ratios in the support area when the degree of prestressing and amount of tension reinforcement in the midspans were kept constant. All test beams were loaded by bending, but one test beam had torsion load in addition to bending. The degree of bending moment redistribution was defined by using nonlinear analysis and equations from the European standard and ACI318, as well as the test results. Moment redistribution clearly occurred on all test beams, and the beams had a high level of deformability.

Publisher

Wiley

Reference22 articles.

1. Comparative study of Prestressed concrete beams, with and without bond;Mattock AH;ACI J,1971

2. On the stress in unbonded tendons at ultimate: critical assessment and proposed changes;Harajli MH;ACI Struct J,2006

3. Proposed Modification of AASHTO-LRFD for Computing Stress in Unbonded Tendons at Ultimate

4. Tendon stress at ultimate in continuous Unbonded post‐tensioned members: proposed modification of ACI 318, Eq. (18‐4) and (18‐5);Harajli MH;ACI Struct J,2012

5. Stress at ultimate in unbonded post‐tensioned tendons: part 2—proposed methodology;Naaman AE;ACI Struct J,1991

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