爆炸冲击荷载下纤维增强钢圆柱壳的界面力学行为与动力响应研究

Some accidents such as oil and gas explosion, collision and impact always cause serious consequence so that it is urgent to improve the anti-blasting and protection techniques for offshore structures. To date, the use of FRP in enhancing the blast resistant performance of steel cylindrical shell has shown extensive application prospect in many fields such as offshore engineering, petrochemical equipment and civil building.Firstly, a series of tests that contain static and high speed impact test of the FRP plates as well as the interface between FRP and steel are carried out,and a viscoelastic constitutive model considering strain rate effect and damage influence is proposed. The failure mechanisms of the FRP plates and the interface between the FRP and steel subjected to high speed impact load are analyzed by tests and simulations. Secondly, based on the Hamilton variational principle and Galerkin method, a precise analysis method is proposed to forecast the elastic-plastic dynamic response of composite cylindrical shell under impact load. In addition, the applicability of dynamic buckling criterion is also discussed. Thirdly, the reinforcement mechanisms and failure modes of FRP strengthened steel cylindrical shell are studied and an optimum strengthening scheme is proposed.All these researches are aim to obtain the comprehensive technology on anti-explosion assessment and anti-explosion reinforcement. The research results are innovative and have important value in the dynamic constitutive of the FRP/steel interface, the analysis methods of elastic-plastic dynamic response for composite cylindrical shell and the methods of anti-explosion assessment. Moreover, the research results have positive meaning in promoting the application of composite materials, enhancing the safety level of important projects and equipments.

油气爆炸、碰撞冲击等事故往往造成严重后果，亟待提高抗爆防护技术水平。利用FRP对钢圆柱壳进行抗爆加固在海洋工程、石化装备及民用建筑等领域有广阔的应用前景。通过开展FRP板、FRP/钢界面的静力和高速冲击试验，提出考虑应变率效应和损伤影响的黏弹性本构模型，揭示高速冲击荷载下FRP板、FRP/钢界面的损伤破坏机理。基于Hamilton变分原理和Galerkin方法，提出复杂动力荷载下复合圆柱壳的弹塑性动力响应分析方法，探讨动力屈曲准则的适用性，掌握爆炸冲击荷载下复合圆柱壳的动力响应特征。研究掌握FRP加固钢圆柱壳的加固机理和失效模式，提出最优加固准则，开发一套复合钢构件的抗爆评估、抗爆加固综合技术。研究成果在FRP/钢界面动态本构、复合圆柱壳的弹塑性动力响应分析方法、复合结构抗爆评估方法等方面具有一定创新性，对于推动复合材料的工程应用，提高重要工程、装备的安全水平具有积极意义。

油气爆炸、碰撞冲击等事故往往造成严重后果，亟待提高抗爆防护技术水平。利用FRP对钢圆柱壳进行抗爆加固在海洋工程、石化装备及民用建筑等领域有广阔的应用前景。开展了复合板壳的刚塑性分析方法研究，推导得到压力管道在低速横向冲击下的变形。开展压力钢管、FRP加固压力钢管的静力试验和冲击试验，提出考虑应变率效应和损伤影响的黏弹性本构模型，建立有限元模型进行模拟验证，揭示冲击荷载下FRP/钢界面的损伤破坏机理。讨论了低速冲击和高速冲击下管道内压和FRP层数对复合管道抗冲击的作用，揭示了FRP加固钢圆柱壳的失效模式，形成一套复合钢构件的抗爆评估技术。研究成果在FRP/钢界面动态本构、复合圆柱壳的弹塑性动力响应分析及抗爆评估等方面具有一定创新性，对于推动复合材料的工程应用，提高重要工程、装备的防护安全具有积极意义。