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为了研究爆炸荷载作用下钢筋混凝土梁板结构的面力效应,该文在钢筋混凝土梁板结构面力效应的静力分析模型基础上,结合弹粘塑性应变速率本构模型,将面力效应的静力分析模型推广应用于动载作用情况,采用单自由度法建立了考虑面力效应的钢筋混凝土梁板结构的动抗力模型,并编制了计算程序,理论计算结果与试验数据吻合较好。此外,利用所提出的分析方法对抗爆结构中常见的典型核爆和化爆荷载作用下的荷载的加载速率、轴向约束刚度和配筋率等主要影响因素进行了分析讨论,并指出:钢筋混凝土结构的面力效应随着加载速率、边界约束强度的提高和配筋率的降低而增强;动抗力提高程度越大,塑性变形也越大。
In order to study the surface force effect of reinforced concrete beam structure under blast load, based on the static analysis model of the surface effect of the reinforced concrete beam structure, combined with the constitutive model of elastic modulus of visco-elastic strain rate, The static analysis model has been widely applied to the dynamic loading. The dynamic resistance model of the reinforced concrete beam plate structure considering the surface effect has been established by single degree of freedom method, and the calculation program has been compiled. The calculated results are in good agreement with the experimental data. In addition, the main influencing factors such as load rate, axial restraint stiffness and reinforcement ratio under typical nuclear explosion and detonation load commonly used in antiknock structure are analyzed and discussed by using the proposed analysis method. It is pointed out that: The surface effect of concrete structure increases with the increase of loading rate, boundary constraint strength and the decrease of reinforcement ratio. The greater the dynamic resistance is, the greater the plastic deformation is.