Experimental and numerical investigation on impact and post-impact behaviours of H-shaped steel members

Zhao, Hui; Wang, Rui; Li, Q.M.; Wu, Hao; Hou, Chuan-Chuan; An, Guoqing

doi:10.1016/j.engstruct.2020.110750

Cited by 20 publications

(4 citation statements)

References 30 publications

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“…A considerable amount of literature has been published on studies of the dynamic behaviour and failure modes of steel members under the transverse impact. In particular, the behaviour of axially restrained beams and axially compressed steel columns has been studied extensively and intensively [16][17][18][19][20]. This is understandable since axially restrained beams and axially compressed steel columns are frequently used as members in buildings and bridges, etc.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

“…The experimental test for calibration was conducted by Zhao et al [19]. The specimens were with fixed-pinned (FP) end condition.…”

Section: Description Of the Testmentioning

confidence: 99%

“…Details of H-shaped specimens [19] Case Specimen label m0 (kg) H0 (m) v0 (m/s) E0 (kJ) Note: m0 is the weight of the hammer, H0 is the hammer release height; E0 is the impact energy before collision; v0 is the initial impact velocity of the hammer.…”

Section: Tablementioning

confidence: 99%

“…5. Referring to the tests conducted by Zhao et al [19], the following parameters were used: the density was 7850kg/m 3 , the modulus of elasticity was 211 GPa, Poisson's ratio was 0.3, yield stress was 291.3 MPa, the tangent modulus was 1.476 GPa and the failure strain was 0.284. Additionally, the Cowper-Symonds model [22] was adopted to scale the yield stress by a strain rate dependent factor, as shown in Eq.…”

Section: Description Of Ls-dyna Modelmentioning

confidence: 99%

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Energy Dissipating Modes and Design Recommendation of H-Shaped Steel Baffles Subjected to Boulder Impact

2021

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Flexible barriers are one of the most effective protective structures, which have been widely used for the mitigation of rockfalls. As the only compression members in a flexible barrier system, steel posts maintain the integrity of the interception structure to keep the function of the system. Due to the random trajectories of rockfalls, steel posts may be impacted by boulders directly. The impact scenario may result in the failure of the post and even the collapse of the system. In this paper, firstly, steel baffles were proposed to be an additional structural countermeasure to avoid the direct impact of posts. Secondly, numerical method was adopted to study the structural behaviour of steel baffles under direct boulder impact. Then, an available published experimental test of H-shaped steel beams under drop weight impact loading by others was back analyzed to calibrate the finite element model. Finally, numerical simulations were carried out to investigate the energy dissipating modes and energy dissipating efficiency of the H-shaped steel baffles. The simulation results show that there are three typical energy dissipating modes of H-shaped baffles subjected to boulder impact, namely flexural, local compression buckling and shear buckling. Local compression buckling is the most efficient energy dissipating mode. The thickness of the web of an H-shaped baffle is suggested to be 4 mm and 6 mm for the rated dissipating energy of 50 kJ and 100 kJ, respectively.

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