Characterization of the shear cracking process in epoxy keyed joints using acoustic emission

被引：0

作者：

Li, Hui ^{[1
]}

Zhou, Yajun ^{[2
]}

Zhang, Ning ^{[1
]}

Shi, Wei ^{[3
]}

Chen, Junling ^{[4
]}

Karimirad, Madjid ^{[5
]}

机构：

[1] Northwest A&F Univ, Coll Water Resources & Architectural Engn, Xianyang, Peoples R China

[2] China Water Resources Beifang Invest Design & Res, Tianjin, Peoples R China

[3] Dalian Univ Technol, Deepwater Engn Res Ctr, Dalian, Peoples R China

[4] Tongji Univ, Dept Struct Engn, Shanghai, Peoples R China

[5] Queens Univ Belfast, Sch Nat & Built Environm, Civil Engn, Belfast, North Ireland

来源：

STRUCTURES | 2025年 / 73卷

基金：

中国国家自然科学基金;

关键词：

Epoxy keyed joint; Crack propagation; Acoustic emission; AE parameter; RA value; Shear failure; FRACTURE PROCESS; CONCRETE; CLASSIFICATION; BEHAVIOR; DAMAGE; MODE; BRIDGES; ENERGY; SIGNAL; SIZE;

D O I：

10.1016/j.istruc.2025.108438

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The utilization of epoxied joints for bonding girder segments in precast concrete segmental bridges (PCSB) has been widely implemented. To gain a comprehensive understanding of the shearing performance of epoxied joints, this study conducted direct shear tests on epoxy keyed and epoxy non-keyed joint specimens, monitoring crack propagation using high-speed cameras and acoustic emission technology (AE). Results showed that concrete crack propagation can be categorized into three frequency ranges: 75-125 kHz, 125-175 kHz, and 275-325 kHz. High-frequency AE signals (275-325 kHz) indicate tensile cracking, while lower frequencies suggest shear failure. By analyzing RA (the ratio of rising time to peak amplitude) and AF (the ratio of ring-down counts to duration) of the AE signals, it was found that the peak positions of the histograms of the RA values for monolithic concrete, epoxy keyed, and epoxy non-keyed specimens were 18 ms/V, 30 ms/V, and 54 ms/V, respectively, while the peak positions of the histograms of the AF values were 110 kHz, 106 kHz, and 98 kHz, respectively. Lower RA and higher AF values indicate tensile failure, while the opposite suggests shear failure. These findings help distinguish between shear and tensile cracks in PCSB structures, providing insights into the failure mechanisms of epoxy bonded joints.

引用

页数：13

共 49 条

[1]

Raison B., Christy F., Review on shear slip of shear keys in bridges, Int J Eng Sci, 7, 4, pp. 231-242, (2016)

[2]

(2003)

[3]

Buyukozturk O., Bakhoum M.M., Michael Beattie S., Shear behavior of joints in precast concrete segmental bridges, J Struct Eng, 116, 12, pp. 3380-3401, (1990)

[4]

Issa M.A., Abdalla H.A., Structural behavior of single key joints in precast concrete segmental bridges, J Bridge Eng, 12, 3, pp. 315-324, (2007)

[5]

Yuan A., Yang C., Wang J., Et al., Shear behavior of epoxy resin joints in precast concrete segmental bridges, J Bridge Eng, 24, 4, (2019)

[6]

Zhou X., Mickleborough N., Li Z., Shear strength of joints in precast concrete segmental bridges, Acids Struct J, 102, 1, pp. 901-904, (2005)

[7]

Jiang H., Wei R., John Ma Z., Et al., Shear strength of steel fiber-reinforced concrete dry joints in precast segmental bridges, J Bridge Eng, 21, 11, (2016)

[8]

Jiang H., Chen L., Ma Z.J., Et al., Shear behavior of dry joints with castellated keys in precast concrete segmental bridges, J Bridge Eng, 20, 2, (2015)

[9]

Jiang H., Li Y., Liu A., Et al., Shear behavior of precast concrete segmental beams with external tendons, J Bridge Eng, 23, 8, (2018)

[10]

Jiang H., Chen M., Sha Z., Et al., Numeric analysis on shear behavior of high-strength concrete single-keyed dry joints with fixing imperfections in precast concrete segmental bridges, Materials, 13, 13, (2020)

← 1 2 3 4 5 →