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| Mechanical properties of Q460 HSS multi-staggered-hole plate after fatigue damage |
| LIANG Gang1,2,YANG Jianan1,LI Shumin1,LIU Yunhe1,2 |
| 1.School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;
2.State Key Lab of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China |
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Abstract In order to study the residual mechanical performance of the staggered-hole plates with Q460 high strength steel (HSS) after fatigue damage, the high cycle fatigue tests and static tensile tests after fatigue damage including 9 groups of 36 specimens with Q460 HSS were conducted. The tests considered the influences of loading coefficient (K), damage parameter (D) and number of staggered holes, i.e., and the influence of these factors on the failure mode, load-displacement curve, bearing capacity and strain distribution mode of the staggered hole plates using Q460 HSS were studied. The results showed that when the parameter D was increased to 0.45, the fracture path of the 3-staggered-hole plates was obviously different from the theoretical yield path, and the fracture surface was irregular; with the increase of the D in a certain range, the deformation capacity of the multi-staggered-hole plate tended to increase, but the bearing capacity of the specimens decreased suddenly earlier. The influence of the K on the bearing capacity of multi-staggered-hole plates was closely related to the parameter D; With the increase of the number of holes, the fatigue damage had a greater impact on the bearing capacity of the specimens. Based on AISC/ANSI 360-16 and EN 1993-1-8 codes, a prediction model for the residual bearing capacity of the multi-staggered-hole plates with Q460 HSS considering fatigue damage was established. The model was in good agreement with the test results, and can better reflect the influence of fatigue damage on the bearing capacity of the multi-staggered-hole plates using Q460 HSS. The research results can provide experimental and theoretical basis for the performance reliability evaluation of high strength steel structures.
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Received: 28 December 2022
Published: 15 December 2023
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