Experimental Study on the Behaviours of Post-tensioned Concrete Members with Unbonded Tendons

Iqbal Peera; Nazar K. Oukaili

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Publication Date

Mon Feb 01 2021

Journal Name

Iop Conference Series: Materials Science And Engineering

Volume

1067

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Experimental Study on the Behaviours of Post-tensioned Concrete Members with Unbonded Tendons

Iqbal Peera

Nazar K. Oukaili

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AbstractThis paper presents experimental results regarding the behaviours of eight simply supported partially prestressed concrete beams with internally unbonded tendons, focusing particularly on the effect of three different variables: concrete compressive strength, <italic>fc </italic>′; jacking stress, <italic>fj </italic>; and the prestressing index, ω. Increasing the concrete compressive strength from 35 MPa to 60 MPa was seen to lead to an increase in load-carrying capacity by about 10%. The load capacity was also affected, though to a lesser extent, by the jacking stress. The failure load of partially prestressed concrete beams with internally unbonded strands was increased by about 2.5%, to 10%, when the jacking stress increased from 0.5 to 0.7 of the strand’s ultimate strength, <italic>fpu </italic>. The test results showed that the prestressing index was the most influential parameter among the examined variables. The experimental results of the stress increase in unbonded strands at failure and the ultimate load resistance of members were also compared to the analytical results of various standards and research methodologies for verification.

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Publication Date

Tue Dec 09 2025

Journal Name

Journal Of Computer-aided Molecular Design

Synthesis, characterization and density functional theory of a novel dichloro(2-(1-anthracene-9-ylmethyl)-1H-1,2,3-triazole-5-yl) pyridine)Cu(II) and polymeric dichloro(2-(1-anthracene-9-ylmethyl)-1H-1,2,3 -triazole-5-yl)pyridine) Cd(II) complexes

K. M.

Ahmed A.

S. J.

C.

J. H.

G. J.

Rasha Ahmed

Aly

Musa E. Mohamed

O. A.

Ali Y.

Ahmed A.

Sameera N.

Antar A.

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(2)

(1)

Publication Date

Thu Jan 01 2026

Journal Name

Chalcogenide Letters

Structural and Optical Properties of Cu2ZnSn(S1−xSex)4 Nanostructures Thin Film for Photovoltaic Applications

Cu2 ZnSn(S1−x Se x)4 thin film

energy gap

dielectric constant

extinction coefficient

refractive index

Bushra A.

Ameer J.

Ahmad A.

Yasser A.

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Copper zinc tin sulfide selenide, Cu2 ZnSn(S1−x Se x)4 , absorbers are promising earth-abundant and environmentally benign materials for low-cost photovoltaic applications. This study investigates the structural and optical properties of Cu 2 ZnSn(S1−x Se x)4 nanostructured thin films prepared by pulsed laser deposition using melt-quenched targets with selenium compositions x = 0.0–1.0. X-ray diffraction revealed that films with low selenium content remained amorphous, whereas higher selenium incorporation promoted the formation of polycrystalline kesterite–stannite phases with preferred orientations along (112), (200), (220), and (312). The crystallite size increased from 12.3 to 17.9 nm as selenium reached x = 1.0, indicating enha

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(1)

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