Seismic Performance Analysis Of Integrated Building-bridge Elevated Station Structure

With the continuous development of urban rail transit in our country,the construction speed of elevated stations is also rapidly increasing.The construction of bridge-in-one viaduct station has the advantages of convenient disposition of building function,small occupied area and good overall structural integrity.At present,the research on the seismic performance of the new type of structural system at home and abroad is not yet mature.In this paper,Tianjin city rail transit Z2 line in the typical bridge built one elevated station-GAOXINYILU Station as the background,the seismic performance of the structural system made the following research:Firstly,the simplified structure model of the whole structure was established by using ABAQUS finite element analysis software.The roof calculation was taken into account in three different ways: actual roof,equivalent load and equivalent concentrated mass.The research shows that the calculation of the equivalent roofing quality instead of the actual roof can reduce the difficulty and the calculation of the modeling,and the results are conservative,which is beneficial to increase the safety reserve of the structure.The equivalent roofing is replaced by equivalent load The analysis will underestimate the structure's response to the earthquake.Secondly,the dynamic time history analysis of the overall model of the station under rare earthquakes is carried out to explore the weak points of the anti-seismic of the bridge construction and integration of elevated station structures.The research shows that the station meets the requirements of existing codes,and the pier and the side longitudinal beam in the first floor are weak anti-seismic positions.Due to the importance of the first-floor pier in the structure,it should be strengthened in the design.Comparing this calculation result with the one obtained when the foundation is just connected,the study shows that considering the seismic performance of the bridge-construction structure on a weak site,considering the soil-structure interaction can improve the safety reserve of the structure,In response to the structural weaknesses put forward corresponding measures.Finally,the measures to improve the seismic performance of the structure are studied.The effect of increasing the section size of the pier,improving the seismic performance of the structure by using the high performance concrete to strengthen the weak parts and handling the weak site are analyzed.The analysis results show thatincreasing the section size of the pier is an effective way to improve the seismic performance of the bridge-in-one structure.However,it is necessary to pay attention to the response of the superstructure when the method is applied to avoid the over-destruction of the superstructure.,The strengthening of weak parts with high performance concrete can effectively reduce the damage of the important structural components.The foundation treatment of soft ground can reduce the response of the structure in the earthquake and improve the overall seismic performance of the structure.