Analysis On Progressive Collapse Resistance Of Reinforced Concrete Staggered Floor Frame Structure

With the gradual improvement of people ’ s quality of life,the comfort and safety of living and office environment also put forward higher standards.Because of the layered space,flexible layout and open field of vision,staggered floor structure has brought people the experience that traditional architectural structure does not have,and gradually favored by Consumer.However,due to its special structural form,the overall coordinated deformation capacity of the structure is poor,and short components are easy to form at the staggered floor,resulting in shear failure.At present,the research on staggered floor structure mainly focuses on its seismic performance and the factors affecting its seismic performance,but there are few studies on the progressive collapse resistance of staggered floor structure.Therefore,this paper uses the method of numerical simulation to study the influence of removing different vertical components on the progressive collapse resistance of reinforced concrete staggered floor frame structure and the factors affecting the progressive collapse resistance of the structure.The main work of this paper is as follows:(1)By reading a lot of literature,firstly introduced the characteristics and classification of split-level structures,then reviewed the research status of split-level structures and structural continuous collapse resistance by domestic and foreign scholars,and then listed the codes used by various countries in the field of structural continuous collapse resistance,and finally introduces the analysis methods and criteria for structural continuous collapse.(2)The Ying Jianke software and SAP2000 are used to model and analyze the simplified RC staggered floor frame structure,and ensure that the indicators do not exceed the specification requirements.(3)The bottom columns in different parts of the structure were removed in SAP2000,and then the progressive collapse analysis of the structure was carried out by using the linear static method and the nonlinear dynamic method.The internal force change and dynamic response of staggered frame structure under different demolition conditions were compared.The calculation shows that the middle column at the internal staggered floor has the smallest influence on the progressive collapse resistance of the structure,and the progressive collapse resistance of the structure is the worst when the angle column is removed.(4)The effects of different floor elements,short columns at different floor staggered floors,staggered floor height and different types of supports on the progressive collapse of the structure were explored.The calculation results show that the floor slab has a significant effect on the progressive collapse resistance of the structure.The selection of floor units directly affects the results of progressive collapse analysis.The progressive collapse resistance of the structure decreases with the increase of the position of the demolition column and the height of the staggered floor.However,the progressive collapse resistance of the structure can be effectively improved by setting oblique support.