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A platform for research: civil engineering, architecture and urbanism
Effect of UHPC strengthening layer on static and fatigue performance of upper cutouts in orthotropic steel decks
Abstract Cutouts are usually used in orthotropic steel decks (OSDs) of bridges and subject to complex stresses under loads. This research performed experimental and theoretical investigations to evaluate the effect of a thin UHPC layer on the fatigue performance of upper cutouts in OSDs. A full-scale specimen was fabricated and tested under static and fatigue loads before and after the specimen was strengthened with the UHPC layer. The results show that a fatigue crack initiated from the weld toe at the upper cutout after 1.15 million cycles of fatigue load with a load range of 216 kN. The use of the UHPC layer generated a steel-UHPC composite specimen subject to an extra fatigue loading for 2 million cycles with the same load range. The propagation length of the fatigue crack was only 1.2 mm, and the propagation rate was reduced from 0.61 × 10−4 mm/cycle to 0.0095 × 10−4 mm/cycle, with a reduction of 98.4%. The peak stress at the crack tip decreased from 139.0 MPa to 51.6 MPa, by 62.9%. A series of finite element analyses was performed to evaluate the fatigue damage. It was found that the use of the UHPC layer significantly reduced fatigue damage in the fatigue-prone detail around the upper cutouts and extended the fatigue life accordingly.
Highlights The mechanism of fatigue-prone detail near the upper cutouts in OSDs was explored. Experimental tests were conducted for a full-scale OSD specimen prior to and after strengthening. The UHPC-based strengthening technique was effective for crack inhibition around upper cutouts.
Effect of UHPC strengthening layer on static and fatigue performance of upper cutouts in orthotropic steel decks
Abstract Cutouts are usually used in orthotropic steel decks (OSDs) of bridges and subject to complex stresses under loads. This research performed experimental and theoretical investigations to evaluate the effect of a thin UHPC layer on the fatigue performance of upper cutouts in OSDs. A full-scale specimen was fabricated and tested under static and fatigue loads before and after the specimen was strengthened with the UHPC layer. The results show that a fatigue crack initiated from the weld toe at the upper cutout after 1.15 million cycles of fatigue load with a load range of 216 kN. The use of the UHPC layer generated a steel-UHPC composite specimen subject to an extra fatigue loading for 2 million cycles with the same load range. The propagation length of the fatigue crack was only 1.2 mm, and the propagation rate was reduced from 0.61 × 10−4 mm/cycle to 0.0095 × 10−4 mm/cycle, with a reduction of 98.4%. The peak stress at the crack tip decreased from 139.0 MPa to 51.6 MPa, by 62.9%. A series of finite element analyses was performed to evaluate the fatigue damage. It was found that the use of the UHPC layer significantly reduced fatigue damage in the fatigue-prone detail around the upper cutouts and extended the fatigue life accordingly.
Highlights The mechanism of fatigue-prone detail near the upper cutouts in OSDs was explored. Experimental tests were conducted for a full-scale OSD specimen prior to and after strengthening. The UHPC-based strengthening technique was effective for crack inhibition around upper cutouts.
Effect of UHPC strengthening layer on static and fatigue performance of upper cutouts in orthotropic steel decks
Wang, Yang (author) / Cao, Junhui (author) / Shao, Xudong (author) / Mao, Qiyuan (author) / Qu, Zhihao (author)
2022-09-06
Article (Journal)
Electronic Resource
English
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