爆炸荷载作用下钢筋混凝土梁板结构的面力效应  

MEMBRANE ACTION ON REINFORCED CONCRETE BEAM-SLAB STRUCTURES SUBJECTED TO BLAST LOADS

作　　者：陈力[1] 方秦[1] 还毅[1] 龚自明[1] 

机构地区：[1]解放军理工大学工程兵工程学院

出　　处：《工程力学》2010年第8期156-163,共8页Engineering Mechanics

基　　金：国家杰出青年科学基金项目(50525825);国家自然科学基金重点项目(90815010)

摘　　要：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。To investigate the compressive membrane action of the reinforced concrete structures subjected to blast loads, a new analytical method was proposed, which can predict the dynamic responses of concrete beams with the action of membrane force under blast loads. The method was based on a single degree of freedom system, which combines an elasto-viscoplastic rate-sensitive material model with the Modified Membrane Design Force Method developed before. A good agreement was observed between the experimental data and the analytical results. The effects of the main parameters such as loading rates, restraint stiffness and reinforcement ratio on the structure subjected to the typical nuclear and chemical explosion loads were analyzed by the proposed analytical method. It was demonstrated that the dynamic resistance capacity increases with the increasing of loading rate as well as longitudinal restraint stiffness and decreasing of the tensile reinforcement ratio, but the more increasing of the dynamic resistance the larger plastic deformation.

关 键 词：爆炸荷载 面力效应 钢筋混凝土 梁板结构 结构抗力 

分 类 号：TJ91[兵器科学与技术—武器系统与运用工程] TU352.1[建筑科学—结构工程]