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边界约束的差异会直接影响结构的抗爆动力响应及承载能力,建立了水平弹性约束和抗弯约束条件下抗爆梁在弹性阶段的数值差分计算方法和塑性阶段的理论解析方法,并计算分析了水平约束刚度、荷载形式以及屈服弯矩动力强化系数对动力响应的影响。计算结果表明,在塑性阶段,水平约束和抗弯约束影响结构的动态响应显著,水平约束使梁截面在变形过程中产生横向压力,抗弯约束直接限制刚体转动,均有效降低了梁位移动力系数,相对提高结构的承载力。相同约束刚度和荷载峰值条件下,平台荷载下结构的位移动力函数均高于三角形荷载下位移动力函数,说明动力荷载的作用时间越长,对结构承载越不利。另外考虑屈服弯矩的动力增强系数时,可提高结构的抗爆潜力。
The difference of boundary constraints will directly affect the dynamic response and bearing capacity of antiknock structure. The numerical differential calculation method and plastic phase analytical method of antiknock beam under horizontal elastic constraint and bending restraint condition are established, and the calculation and analysis The influence of horizontal restraint stiffness, load form and dynamic strengthening coefficient of yielding moment on dynamic response is studied. The results show that in the plastic stage, the dynamic response of horizontal and lateral bending restraints is significant. The horizontal restraints make the cross-section of the beam produce lateral pressure in the deformation process, and the bending restraint directly limits the rotation of rigid bodies, which effectively reduces the dynamic displacement coefficient , Relatively improve the bearing capacity of the structure. Under the same restraining stiffness and peak load, the displacement dynamic function of the structure under the platform load is higher than that under the triangular load, which shows that the longer acting time of the dynamic load, the more adverse to the bearing of the structure. In addition, considering the yield strength of dynamic yield coefficient, can improve the antiknock potential of the structure.