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目前,对爆炸荷载作用下的钢筋混凝土(RC)结构和构件的设计主要采用控制其动力响应最大位移的方法,例如TM-5和ASCE的试算法,类似于静力作用下的极限状态设计法,虽然过程简单,却无法获得最优化的设计。由RC板的抗力—挠度(R-y)曲线分析可知,曲线下方面积代表板在爆炸荷载作用下可能吸收的能量,直接体现RC板抵抗爆炸荷载的能力。采用TM-5和ASCE推荐的单自由度体系简化RC简支单向板,选用双折线模型计算RC板的R-y曲线,分析不同配筋率的R-y曲线下方面积,面积最大时的配筋率即为该设计的最佳配筋率,改变板的几何尺寸,按上述方法分别得出不同设计方案的最佳配筋率。爆炸荷载作用下必须考虑应变率对混凝土和钢筋的应力影响和材料非线性,不能直接应用静力计算中的矩形等效原则简化计算,研究采用分层法迭代求解R-y双折线的特征值。研究成果和分析方法对爆炸荷载作用下的RC板的结构设计和加固设计具有较高的指导价值。
Currently, the design of reinforced concrete (RC) structures and components under blast load mainly adopts the methods of controlling the maximum displacement of dynamic response, such as the TM-5 and ASCE trial algorithms, similar to the limit state design method under static load , Although the process is simple, but can not get the optimal design. From the analysis of the resistance-deflection (R-y) curve of the RC plate, the area under the curve represents the energy that the plate may absorb under the explosion load and directly reflects the ability of the RC plate to resist the explosion load. Using the single degree of freedom system TM-5 and ASCE recommended RC simplified one-way board, the use of double line model to calculate the Ry curve of the RC board, analysis of different reinforcement ratio of the area under the Ry curve, the maximum area of the reinforcement ratio For the design of the optimal reinforcement rate, change the board geometry, according to the above methods were obtained for the best design of different reinforcement ratio. The effect of strain rate on the stress and the material nonlinearity of concrete and steel bar must be considered under the action of blast load. The rectangular equivalent principle in static calculation can not be applied directly to simplify the calculation. The eigenvalue of R-y bilinear line is iteratively solved by the layered method. The research results and analytical methods have a high guiding value for the structural design and reinforcement design of the RC plate under blast load.