Study on Anchorage System of Metal Liners Subjected to Impact Load

研究了不同类型的金属衬垫对结构在冲击荷载作用下混凝土表面的保护作用。1994 ~ 1995年，对这些结构的强度特性、破坏模式和吸能能力进行了基础研究。通过研究可以找到最佳的金属衬垫形状和最佳的锚固类型。本研究的步骤和结果如下：首先，对不同形状和锚固类型金属衬垫的试验数据进行了分析，找出了每次试验的冲击载荷特征和吸能能力。分析结果表明，由变形钢筋锚固的十字形肋金属衬垫的性能最好。第二步是对金属衬砌、锚固系统（包括锚杆和混凝土体）进行建模，并采用有限元法对该模型进行弹塑性分析。将分析结果与静态试验数据进行了比较，建立了能合理模拟静态试验的模型。研究的第三步是利用冲击非线性分析有限元软件包Dyna3D （LS-Dyna）建立试样和边界条件的数值模型，并将分析结果与试验数据进行比较，建立能够准确模拟冲击载荷冲击行为的新模型。用于撞击器模型的材料是钢、混凝土和岩石。然后，对几种锚固形式的影响进行了参数化研究。此外，还找到了建立设计方法所需的基本数据。最后一步是利用冲击载荷试验中分析结果与能量吸收能力之间的关系，建立基于能量吸收能力准则的新设计方法。此外，针对金属衬板的硬化问题，提出了一种冲击载荷历史预测方法。少

Different types of metal liners are investigated to protect the concrete surface of structures subjected to impact load. During the period from 1994 to 1995, the basic research has been carried out in order to investigate the strength characteristics, the failure modes and the energy absorption capacity of these structures. This research could find the best shape of metal liners and the best anchorage type. The steps and results of this research were as follows.First, the test data of metal liners with several shapes and anchorage types were analyzed to find the characteristics of the impact load and the energy absorption capacity in each test. The result of this analysis showed that the metal liner with cruciform ribs anchored by the deformed steel bars had the best performance.The second step was to model tlie metal liner, the anchorage system including the anchor bolts and the concrete body, and to use the Finite Element Method (FEM) to carry out the elasto-plastic analysis of this … More model. The results of the analysis were compared with the static test data, and a model that can reasonably simulate the static test was developed.The third step of the research was to use Dyna3D (LS-Dyna), an impact nonliner analysis FEM package, to create a numerical model of the specimen and the boundary conditions, and to compare the results of analysis with the test data in order to develop a new model that can accurately simulate the impact load impact behavior. The materials used for the impactor's model were steel, concrete, and rock. Then, a parametric study has been made to study the effect of several types of anchorage. In addition, basic data needed for establishing a design method were found.The final step was to use the relationship between the analysis results and the energy absorption capacity in the case of impact loading test to establish a new design method based on the the energy absorption capacity criterion. In addition, focusing on the hardening of metal liner, a method for impact load history prediction has developed. Less