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为建立爆炸作用下钢筋混凝土柱非线性动力响应及破坏模式的高效分析方法,从材料应力-应变关系出发,分别应用截面分层法、修正压场理论方法(MCFT)和Krauthammer模型建立了单调加载条件下抗力曲线(包括截面弯矩-曲率关系、平均剪应力-平均剪应变关系和直剪剪力-直剪滑移关系),并以单调加载条件下抗力曲线为骨架,提出了加卸载条件下RC柱截面抗力曲线;在此基础上,根据Timoshenko梁理论和有限差分方法,建立了爆炸作用下RC柱非线性动力响应的显式分析方法。研究结果表明:本文方法能够定量分析爆炸作用下RC柱的动力响应和破坏模式,计算结果与相关试验数据有较好的一致性。
In order to establish an efficient analytical method for nonlinear dynamic response and failure mode of reinforced concrete columns under explosive action, the monotonic loading (MCFT) and Krauthammer model are respectively applied to the stress-strain relationship of the materials. Under the conditions of the resistance curve (including the section of the moment - curvature relationship, the average shear stress - average shear strain relationship and shear shear force - direct shear slip relationship), and the monotonic load resistance curve as the skeleton, the loading and unloading conditions Based on this, based on Timoshenko beam theory and finite difference method, an explicit analytical method for the nonlinear dynamic response of RC columns under explosion was established. The results show that the proposed method can quantitatively analyze the dynamic response and failure modes of RC columns under the action of explosion, and the calculated results are in good agreement with the relevant experimental data.