New Method of Proportional Prestress Tendon Line (MPPTL) for Continuous Prestressed Concrete Beams with Non-Concordant Cables

Session

Civil Engineering, Infrastructure and Environment

Description

This paper presents a new physically consistent analytical approach for continuous prestressed concrete (PSC) beams with non-concordant tendons — the Method of Proportional Prestress Tendon Line (MPPTL). Unlike traditional approaches (Lin [1], Eurocode 2 [2], CEBFIP [3]), which describe moment redistribution empirically, the MPPTL introduces a physical parameter λ–θₚ that correlates the proportional displacement of the prestress tendon line (compression line) with the development of plastic rotation. The method ensures energy balance between the support and midspan regions, establishing a continuous transition from elastic to plastic behaviour. An upper limit for λₘₐₓ is proposed according to the Eurocode 2 redistribution limit (ΔM/M ≤ 30%), ensuring both physical realism and code compliance. Validation agains excellent agreement with deviations under 5%.

Keywords:

Prestressed concrete, continuous beams, non-concordant tendons, moment redistribution, MPPTL method

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-982-41-2

Location

UBT Kampus, Lipjan

Start Date

25-10-2025 9:00 AM

End Date

26-10-2025 6:00 PM

DOI

10.33107/ubt-ic.2025.59

This document is currently not available here.

Share

COinS
 
Oct 25th, 9:00 AM Oct 26th, 6:00 PM

New Method of Proportional Prestress Tendon Line (MPPTL) for Continuous Prestressed Concrete Beams with Non-Concordant Cables

UBT Kampus, Lipjan

This paper presents a new physically consistent analytical approach for continuous prestressed concrete (PSC) beams with non-concordant tendons — the Method of Proportional Prestress Tendon Line (MPPTL). Unlike traditional approaches (Lin [1], Eurocode 2 [2], CEBFIP [3]), which describe moment redistribution empirically, the MPPTL introduces a physical parameter λ–θₚ that correlates the proportional displacement of the prestress tendon line (compression line) with the development of plastic rotation. The method ensures energy balance between the support and midspan regions, establishing a continuous transition from elastic to plastic behaviour. An upper limit for λₘₐₓ is proposed according to the Eurocode 2 redistribution limit (ΔM/M ≤ 30%), ensuring both physical realism and code compliance. Validation agains excellent agreement with deviations under 5%.