Study on the Seismic Performance of Subway Station Structures with Split Columns Based on Different Analysis Methods
The central columns in shallow buried subway station structures are prone to high axial compression ratios and insufficient horizontal deformation capacity when subjected to horizontal and vertical seismic loads.Due to their good ductility under high axial compression,reinforced concrete split columns are widely used in high-rise building structures and are also gaining attention in the seismic design of underground station structures.The use of scientific and reasonable numerical mod-els and analysis methods to evaluate the seismic performance of subway station structures with split columns has become one of the key issues.This study used a single-story double-span subway sta-tion structure with split columns as an example and established three-dimensional(3D)and two-di-mensional(2D)finite element analysis models using dynamic time-history analysis method,response acceleration method,and Pushover analysis method.The seismic performance was evaluated through inter-story drift angles,and the calculation precision of different analysis methods in calculat-ing column deformation and key section internal forces was compared.The results showed that the inter-story drift angle of the station structure was much smaller than the current criterion of 1/550 when using different analysis methods under different earthquake loads,which met the engineering design requirements;Reducing the elastic modulus and density of the unit columns in the split col-umns,or keeping the friction coefficient between the unit columns unchanged,was an effective meth-od for establishing a 2D analysis model of subway station structures with split columns.Taking into account both computational cost and efficiency,the 2D Pushover analysis method can obtain similar calculation results to the 3D dynamic time-history analysis method,and is recommended for use in engineering design.
万方数据
维普
