循环载荷混合作用下加筋板格极限强度的研究

On Ultimate Strength of Stiffened Plates under Cyclic Load

通过采用非线性有限元软件ABAQUS进行循环载荷作用下加筋板格的极限强度研究,获得循环载荷作用下加筋板结构中残余应力、侧向荷载、随动强化及循环应变幅混合作用对极限强度的影响规律。数值结果显示:加筋板在0.16 MPa侧压、15%残余压应力、3.2倍屈服应变幅下,循环4次后的极限强度下降达39%,这表明循环载荷混合作用对极限强度的影响是不可忽视的。该研究成果对于进一步理解和研究船体梁在循环载荷作用下的递增塑性破坏的机理具有一定的理论价值和实用价值。

The ultimate strength of the stiffened plates under cyclic load has been studied by using the nonlinear finite element software ABAQUS,resulting in the combined effect of the residual stress,lateral load,kinematic hardening and the effect combined with the cyclic stress amplitude on the ultimate strength of the stiffened plate under the cyclic loading.The results show that the ultimate strength of the stiffened plate declines 39%after four cycles with a lateral load of 0.16 MPa,15%residual compressive stress and 3.2 times yield strain amplitude.It indicates that it is essential to take into account the effect of cyclic load on the ultimate strength.The research is of certain theoretical and practical value for further understanding and studying of the mechanism of the incremental plastic collapse of the hull girder under the cyclic load.