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Open Access

ARTICLE

Flexural Behavior of Hollow Slab Beams Strengthened by a Novel Top-Anchored External Prestressing System: An Experimental Benchmark Study

Liyuan Wang1, Heng Qiao1, Zhenbin Huang1, Krishna Shrestha2,3,*, Xueyuan Yan1
1 College of Civil Engineering, Fuzhou University, 2 Xue Yuan Road University Town, Fuzhou, China
2 College of Civil Engineering, Fujian University of Technology, Fuzhou, China
3 Urban Transport Research Centre, Western Sydney University, 161–169 Macquarie St, Parramatta, NSW, Australia
* Corresponding Author: Krishna Shrestha. Email: email
(This article belongs to the Special Issue: Durability Assessment of Engineering Structures and Advanced Construction Technologies)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.080806

Received 15 February 2026; Accepted 01 April 2026; Published online 30 April 2026

Abstract

This paper introduces a novel external prestressing system specifically designed for strengthening hollow slab beams. To validate the system’s feasibility and isolate flexural behavior from interface slip effects, experimental investigations were conducted on monolithically cast specimens representing an idealized, fully bonded state. By integrating theoretical analysis, experimental testing, and finite-element numerical simulation, the study examines the mechanical behavior and design principles of the proposed configuration. Results indicate that the stress development process of the externally prestressed beam (N2) exhibits strong similarity to that of a conventional internally prestressed beam (N1). Notably, the implementation of the top-anchored external prestressing tendon in specimen N2 produced a marked improvement, increasing the flexural bearing capacity by approximately 10% compared to the internally prestressed reference beam (N1). Furthermore, the monolithic anchorage zone remained intact with no observed cracks or wire rupture. These findings confirm the structural reliability of the proposed system under ideal bonding conditions, establishing a critical performance benchmark for the practical strengthening and extended service life of existing bridge infrastructure.

Keywords

Bending performance; hollow slab beam; external prestressed tendon; numerical simulation; experimental research

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