Study On Seismic Performance Of Subway Stations Use Core Column And Split Column

With the high-speed development of China's urbanization is becoming more and more crowded,China has entered the golden time of metro engineering construction.Subway underground station belongs to lifeline engineering,once destroyed in the earthquake,it will cause serious social consequences and huge economic losses,Therefore,it has great significance to study on mechanical properties and damage characteristics of metro stations in earthquakes.Taking nanning rail transit line 4 of a metro station research project as background,study the performance of subway stations in the earthquake,the article mainly completed the following contents:According to the actual engineering establish subway station numerical model,study on mechanical properties and damage characteristics of metro station in the earthquake process,it is concluded that the center pillar of a subway station is more complex in the process of earthquake.it is the most seriously damaged component.Choose a standard period of actual engineering,taking the typical frame column,cored column and split column in the subway station as reference,design eight reinforced concrete columns with 1/2 scale ratio,taking the different types of columns of numerical simulation,researched and analyzed the stiffness degradation,ductility and hysteretic energy of various components.Using finite element software to establish a suitable metro station model,for the phenomenon of baseline drift,using SeismoSignal software to baseline correction of seismic wave,the model used finite element method and infinite element method,infinite element to simulate the soil,finite element simulation soil around the station structure.Through time-history analysis of core columns and frame columns in subway stations,the bearing capacity of the core column and the frame column are less than 9% under earthquake,the ductility of cored columns increased approximately 15%,under the condition that the bearing capacity meets the requirements,using cored column not only can improve the ductility of the column,but also reduce the cross-sectional size of the column about approximately 10%,it is effect to optimiz the construction space.Through time-history analysis of split columns in subway stations,the load capacity of split columns is less than 16% that of frame columns under earthquakes,however,the ductility of split columns increased by about 35%,in other words,the split column losed some of its bearing capacity,change the force characteristics of the frame column,and greatly improve the ductility of the column.Through the analysis of this study: Using core column and split column instead of the traditional frame column not only can change the seismic performance of underground structures but also can better adapt to the displacement deformation of the soil around the underground building structure,the research can supplement and improve the theoretical analysis of seismic performance of underground buildings and also provide reference for the promotion and application of cored columns and split columns.