不同波纹钢-混凝土板复合结构水下抗爆机理及损伤等级预测

Underwater anti-explosion mechanism and damage grade prediction of different corrugated steel-concrete slab composite structures

为探究不同波纹钢-混凝土板复合结构的水下抗爆机理,采用光滑粒子流体动力学与有限单元(FEM-SPH)耦合方法模拟混凝土板在水下接触爆炸下的损伤过程,并与试验结果对比,以验证数值方法的有效性;采用FEMSPH方法探究不同防护方案下墙面板毁伤过程及失效模式,揭示其水下防爆机理,并构建出墙面板损伤等级预测曲线。研究结果表明:模拟结果与试验结果较为吻合,验证了模拟方法的有效性;在含12 mm厚波纹钢的复合结构(T-12)、含75°夹角的波纹钢复合结构(A-75)和含厚70 mm波纹钢的复合结构(WH-70)三种防护方案下,墙面板的毁伤范围较未加固墙面板最大降幅分别为83.0%、81.6%和82.5%;预测曲线可以直观评估出炸药量和复合结构中波纹钢波高变化对墙面板损伤等级的影响。

In order to explore the underwater anti-explosion mechanism of different corrugated steel-concrete slab composite structures,the damage process of concrete slab under underwater contact explosion was simulated by smoothed particle hydrodynamics and finite element method(FEM-SPH),and the validity of the numerical method was verified by comparing with the experimental results.The FEM-SPH method was used to explore the damage process and failure mode of the wall panel under different protection schemes,to reveal the underwater explosion-proof mechanism,and to construct the prediction curve of the damage grade of the wall panel.The results show that the simulation results are in good agreement with the experimental results,which verifies the effectiveness of the simulation method.Under different protection schemes,the damage range of the wall panel with 12 mm thick corrugated steel composite structure(T-12),75o angle corrugated steel composite structure(A-75)and 70 mm corrugated steel composite structure(WH-70)is 83%,81.6%and 82.5%lower than that of the unreinforced wall panel,respectively.In the composite structure,the explosion shock wave propagates to the corrugated steel in the form of incident wave and then propagates in the structure in the form of transmitted wave and reflected wave.When the transmitted wave reaches the lower surface of the corrugated steel,part of the shock wave will continue to propagate to the wall panel,while the remaining shock wave is reflected to form reflected longitudinal wave and reflected transverse wave,which further attenuates the transmitted shock wave acting on the wall panel to achieve the effect of wave clipping and energy absorption.The prediction curve can directly evaluate the influence of explosive amount and wave height change of corrugated steel in composite structure on the damage grade of wall panel.