建筑结构学报2009，Vol.30Issue(6)：60-66,7.
爆炸荷载作用下钢筋混凝土板破坏评定方法
Damage analysis and assessment of RC slabs under blast load
摘要
Abstract
Pressure-impulse (P-I) diagrams are commonly used in the preliminary design or assessment of structures to establish safe response limits for given blast load. However, the current practice in generating P-I diagrams is primarily based on the SDOF system theory and the maximum deformation related damage criterion. In actual situations, structural components might deform in high order modes and be damaged locally under blast load. Therefore, the simplified SDOF system can't accurately represent the structural component. The combined shear and flexural damage mode is also very likely to occur, in which case the maximum deflection related damage criterion will also fail to assess the damage level of structural components under blast load. In this paper, the finite element model of a typical two-way RC slab was established in software LS-DYNA. Based on the model, both the damage process and possible damage modes were analyzed and discussed. A new damage criterion for RC slab under blast load was defined, which was residual bending capacity related. With a series of numerical simulations, P-I diagrams of the slab were generated based on the defined damage criterion. Analytical formula to generate the P-I diagram for the two-way RC slab was also derived through the curve fitting method. P-I diagrams generated from the proposed method can be used to evaluate the damage degree of the RC slab under any blast load.关键词
钢筋混凝土板/爆炸荷载/有限元分析/破坏指标/破坏评定/压力-冲量(P-I)曲线Key words
RC slab/blast load/finite element analysis/damage criterion/damage assessment/pressure-impulse (P-I) diagram分类
建筑与水利引用本文复制引用
李忠献,师燕超,史祥生..爆炸荷载作用下钢筋混凝土板破坏评定方法[J].建筑结构学报,2009,30(6):60-66,7.基金项目
国家自然科学基金重点项目(50638030),国家科技支撑计划重点项目(2006BAJ13B02),天津市应用基础和前沿技术研究计划重点项目(08JCZDJC19500). （50638030）
