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Structural Engineering and Mechanics Volume 81, Number 1, January10 2022 , pages 59-68 DOI: https://doi.org/10.12989/sem.2022.81.1.059 |
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Experimental and analytical study on prestressed concrete hollow slabs with asymmetric boundary conditions |
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Haiying Ma, Minghui Lai and Ye Xia
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| Abstract | ||
| Prestressed prefabricated hollow core concrete slabs with spans of 5 m and 10 m are commonly used since last century and still in service due to the advantage of construction convenience and durability. However, the end slabs are regularly subjected to cracks at the top and fail with brittleness due to the asymmetric boundary conditions. To better maintain such widely used type of hollow core slabs, the effect of asymmetric constraint in the end slabs are systematically studied through detailed nonlinear finite element analyses and experimental data. Experimental tests of slabs with four prestressed tendons and seven prestressed tendons with different boundary conditions were conducted. Results observe three failure modes of the slabs: the bending failure mode, shear and torsion failure mode, and transverse failure mode. Detailed nonlinear finite element models are developed to well match the failure modes and to reveal potential damage scenarios with asymmetric boundary conditions. Recommendations regarding ultimate capacity of the slabs with asymmetric boundary conditions are made to ensure a safe and rational design of prestressed concrete hollow slabs for short span bridges. | ||
| Key Words | ||
| asymmetric boundary conditions; cracks; finite element analysis; precast hollow core; prestressed tendons | ||
| Address | ||
| Haiying Ma: Department of Bridge Engineering, Tongji University, Shanghai, 200092, China Minghui Lai: Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Chengdu,610041, China Ye Xia: Department of Bridge Engineering, Tongji University, Shanghai, 200092, China | ||