Performance Research On The Progressive-collapse Resistance Of Reinforced Concrete Frame-shear Wall Structure

The collapse accidents of high-rise building structure occurred frequently,not only caused huge loss of life and property,but also has a great impact on people’s psychological and social order.However,current research on the progressive collapse of high-rise structures is scarce,which is mainly focused on the frame construction of simple rules.As a common structural form of high-rise buildings,there is a lack of reliable and practical analysis and evaluation methods for the progressive collapse of frame shear walls.Based on this,the numerical analysis model of frame shear wall structure is established by using SAP2000 software.Linear dynamic and nonlinear static Pushdown analysis method is used to analyze the dynamic response and collapse mechanism of collapse.Finally,the paper puts forward the relevant measures to prevent the progressive collapse of the structure and the reconstruction scheme,the main contents include:(1)The finite element model of frame shear wall structure is established according to the current design code in China,The linear dynamic analysis method is used to study the vertical displacement,acceleration and dynamic response of the joints in the structure after the failure of the local vertical bearing members.At the same time,the internal force mechanism and the law of the collapse of the structure are studied,which is different from the failure position and the floor.The results show that the larger vertical displacement and acceleration of the joints,the larger dynamic response of the structure,and the greater risk of continuous collapse.After the failure of the same position in the same floor,the risk of progressive collapse of the structure increases with the increase of the floor.(2)In order to analyze the complex and difficult dynamic characteristics of continuous collapse,nonlinear static Pushdown analysis method is used as a supplement to linear dynamic analysis.Further more,the mechanism of collapse,the change of resistance,the development sequence of plastic hinge and the space position and ductility ratio are studied.The results show that the residual resistance ratio and ductility ratio of the same position of the same floor decrease with the increase of the floor of the failure component,and vice versa.The development of plastic hinge is mainly confined to the whole span of the failure component,and the adjacent beam end is still in the elastic stage even if the structure is in the critical state of collapse.(3)Based on the above analysis,the strategies and methods to improve theprogressive collapse of frame shear wall structure are put forward.By improving the construction scheme,to ensure continuity,improve the structure redundancy etc,the progressive collapse-resisting performance of the structure is guaranteed,and the scheme of of increasing the steel truss of roof is put forward.