Karafan Journal

Karafan Journal

Investigating the effect of loading rate and compressive strength on flexural failure modes of RC beam under impact load by numerical analysis method

Document Type : Original Article

Authors
Ahmad Rahmati Alaei 1
Seyed Mohammad Hosein Khatami 2
1 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
2 Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran.
10.48301/kssa.2025.476674.2985
Abstract
In this research, the effect of loading rate and compressive strength on flexural failure modes of reinforced concrete (RC) beams under free fall impact loads is analyzed and evaluated using numerical simulations based on experimental tests. According to the numerical results, the deformation of the middle of the reinforced concrete beam compared to the free fall impact test has a difference of less than 8% (equivalent to 0.5 mm); therefore, the numerical model developed using LS-DYNA finite element code can be used with acceptable accuracy to predict the damage to the RC beam and crack patterns. In the S1616 sample test, the similarity of the bending failure modes is observed according to the effective plastic strain. In this study, 5 different loading rates from low to high, including 2 m/s, 4 m/s, 6 m/s, 8 m/s, and 10 m/s, are analyzed for compressive strengths of 32 MPa, 42 MPa, and 52 MPa. The results show that for every 10 MPa increase in concrete compressive strength, the maximum deflection of the RC beam decreases by approximately 10%. At a very high loading rate (10 m/s), the impact force increases by about 31% in the compressive strength between 32 MPa and 52 MPa. Furthermore, for critical impact conditions, increasing the diameter of steel rebars does not significantly affect the maximum deflection.
Keywords
Reinforced Concrete (RC)
Bending Failure Modes
Loading Rate
Compressive Strength
Finite Element Analysis (FEA)
Subjects
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Karafan Journal
Volume 22, Issue 3
Technical and Engineering
Autumn 2025
Pages 193-218

  • Receive Date 09 September 2024
  • Revise Date 28 January 2025
  • Accept Date 16 April 2025