Abstract:In this study, the mechanical properties of low-alloy components under repeated loads were studied by establishing finite element models of low-alloy components, taking secant modulus of elasticity, load deflection and crack characteristics as indicators. The test results show that the secant modulus of elasticity of low-alloy steel members decreases with the increase of loading times under the repeated loading conditions of 25 kN and 35 kN, and the load deflection increases from 0.5 mm to 2.0 mm. When the number of repeated loads is 750,000 and the value of repeated loads is gradually increased in the range of 25 kN-35 kN, the cracks of low alloy reinforced concrete members increase gradually, and the average crack width increases from 0.09 mm to 0.23 mm, showing a trend of overall increase and local instability fluctuation.