Study On Impact Behavior And Application Of Single Steel-plate Concrete Composite Structures

This dissertation focused on the mechanical behavior and application of the single steel-plate concrete composite(HSC)containment structures.Based on the three levels of configuration-component-structure,the dynamic and static mechanical behavior of the HSC containment structures were investigated by experimental research,theoretical analysis and numerical simulation.The main results and achievements of the research are as follows:(1)Pull-out tests were carried out on 19 groups(a total of 39 samples)of HSC connection specimens with different detail parameters.The effect of constraint mode,anchoring methods of the tie bar,connector forms and the concrete strength on the tensile resistance of the local specimens were mainly investigated.The failure modes,ultimate tensile resistance,load-slip characteristics and strain development of the specimens were analyzed.Furthermore,the deformation patterns and load-transferring mechanism of different connection methods were compared,and design suggestions were proposed.(2)The theoretical model of the ultimate tensile resistance of the HSC connection was derived based on plastic limit analysis.The finite element model of the connection was established,and failure mode,tensile resistance,stifness and ductility were analyzed.Both the theoretical model and the finite element model were validated against the experimental results,and optimization suggestions were proposed.(3)17 impact tests on the HSC targets were completed to study the impact resistance of the HSC panel-element.The focus was on the effects of structural forms,connection methods,stirrup ratio,the thickness of steel plate,and the enhancement of stiffeners.The failure modes and dynamic response characteristics of the specimens were examined and the damage distribution and deformation characteristics of the panel-element were analyzed.(4)A finite element model was developed to evaluate the impact resistance of the HSC panel-element,in order to simulate failure mode,deformation state and dynamic response characteristics.By comparing the numerical and experimental results,the accuracy of the finite element model was verified.Parametric analysis was carried out based on the proposed finite element model for panel-element with either TBIJC or anchor-ended TBOHS,and the assessment method of the critical impact velocity was proposed.(5)Based on the verified finite element model of the commercial aircraft,a finite element model was developed for the impact analysis of the HSC containment structure,and the damage modes,deformation distribution and dynamic response characteristics of the containment structure were simulated.Based on the optimized boundary condition,the influence of impact conditions and structural forms on the impact behavior of the HSC containment structure was parametrically studied.