Researches On The Progressive Collapse Resistance Of CFRP Cable Dome Structures

The combination of Carbon Fiber Reinforced Plastics(CFRP)and cable domes forms CFRP cable domes,which can not only fully utilize the high tensile strength of CFRP,but also reduce the structural self-weight and achieve a larger span.Therefore,CFRP cable domes own excellent practical application value and scientific research significance.However,few researches on the progressive collapse resistance of CFRP cable domes are conducted.The main contents are as follows:Based on the force-finding principle of cable domes,the Matlab program is adopted to solve the self-stress mode of the structure.Meanwhile,considering the limitation of the cable stress and the maximum displacement,the 100m-span Geiger and Levy CFRP cable domes are designed with the same stiffness and mass,and the static and dynamic characteristics of the above two cable dome are obtained by Ansys.The first step of progressive collapse analysis of cable domes is to determine the initial failure components.Therefore,by analyzing and comparing the methods of determining the initial failure components,the evaluation indicators for the progressive collapse resistance of the cable dome structure is proposed,and the the comparsion between the static and dynamic AP method(the Alternate Path method referred to as AP)is conducted.According to the static AP method,the static dismantling analysis of of Geiger and Levy CFRP cable domes is analyzed by Ansys finite element software,which reveals the effect of the cable dome types,removal positions and load cases on the importance coefficient,and preliminarily determines the contribution of each component to the structural progressive collapse resistance.Considering the nonlinear and dynamic effects of the structure and according to the dynamic AP method,the equivalent load instantaneous unloading method is adopted to simulate the removal of the initial failure components.The progressive collapse process of Geiger and Levy CFRP cable domes after the removal of different types of components is analyzed and compared by using Lsdyna finite element software.Then,according to the importance coefficient,the collapse control equation of the structure is established.Finally,the comparisons between different collapse modes,failure sequence and spare path are conducted.Meanwhile,the feasibility of using the static AP method to guide the dynamic progressive collapse is verified.Parametric analysis of Geiger and Levy CFRP cable domes is implemented,including initial prestress,cross-sectional area,damping ratio,and failure strain.The influence of the above parameters on the structural progressive collapse resistance are analyzed.Eventually,based on the above analysis results,the design suggestions for the progressive collapse resistance of the CFRP are presented.