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 Number of cracks has nearly no effect on the stress intensity factors  Increase in the crack depth increases the midspan deflections and stress intensity factors, both  Existence of crack in the beam has great effect on the dynamic behavior of beam Figure A. Modelling a crack and variation of sifs depending on load speeds Purpose: This study focuses on the stress intensity factors at crack tip in a simply-supported elastic beam with multiple cracks subjected to moving loads. Theory and Methods: Massless rotational spring is used to model cracks. Natural frequencies and mode shapes are obtained by the transfer matrix method. Equation of motion for the forced vibration problem is then solved numerically by the Newmark method. Results: For four different damage cases, variation of the maximum deflections of the beam with crack size and location for various load speeds is investigated. Stress intensity factors at crack tips are studied in detail for load speeds, crack size and location. Conclusion: According to the study, the number of cracks has no effect on the stress intensity factors. However, the crack depth is the most important parameter on both the deflections and stress intensity factors.