爆炸载荷下RC单向简支板的能量法优化设计

OPTIMIZED DESIGN OF A SIMPLE SUPPORTED ONE-WAY RC SLAB UNDER BLAST LOADS BY ENERGY APPROACH

由钢筋混凝土(RC)板的抗力-位移(R-y)曲线特性可知,曲线下方面积代表板在爆炸载荷作用下可能吸收的能量.对爆炸载荷作用下RC板的R-y曲线采用双折线模型,计算不同配筋率的R-y曲线下方面积,面积最大时的配筋率即可定义为相应设计的最佳配筋率.考虑材料非线性及高应变率对混凝土和钢筋强度的影响,采用分层法迭代求解抗力-挠度(R-y)曲线.研究结果可供受爆炸载荷的RC板优化设计借鉴.

The area under resistance-deflection （R-y） curve of reinforced concrete （RC） slab gives the energy which a RC slab can absorb when subjected to the blast loads. For the RC simple supported one-way slab under blast loads, a bilinear model is used to simulate the R-y curve in the analysis of blast dynamic response. After comparing the areas under the R-y curves of RC slabs with different reinforcement ratios, the reinforcement ratio responding to the biggest area can be defined as the optimal reinforcement ratio. Because the effects of nonlinearity of the material and the strain rate on the reinforced concrete and reinforcing steel should be considered, a layered method is used to determine the R-y curves and the dynamic response of slabs. The derived results can be used to optimiz design of RC simply supported one-way slabs.