Nonlinear seismic response analysis of direct air-cooled condenser vertical hybrid structure with diagonal bracing
Steel-concrete vertical hybrid structure with diagonal bracing is a new structure system which is proposed in order to apply the direct air-cooled technology in high earthquake intensity areas, according to the type of platform, it can be divided into two types: steel truss-diagonal bracing structure and solid web girder-diagonal bracing structure. On the foundation of the seismic experiment of steel truss- diagonal bracing model structure, finite element software ABAQUS is used to calculate and analyze the base shear response, deformation properties and damage evolution characteristics of reinforced concrete pipe columns of two kinds structures with diagonal bracing. The results show that: the proposed simplification principles and finite element modeling methods are reasonable, calculated results agree well with the test results; under different earthquake intensities, the biggest base shear force and the shear-weight ratio of the steel truss-diagonal bracing structure are greater than the solid web girder-diagonal structure; the lateral displacement curves for two kinds of structures are both shifting from shear-moment-type toward shear-type as the earthquake intensity increase; the lateral displacement on and below the corbel of the steel truss-diagonal bracing structure is slightly greater than the solid web girder-diagonal structure, while above the corbel, it is just the opposite; the lateral displacement angel on the top of the column for the steel truss-diagonal bracing structure is slightly smaller than the solid web girder-diagonal structure; seismic performances of two kinds of structures are both good, which can meet the seismic acquirement of the large-capacity units in high earthquake intensity areas.
1. School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2. School of Civil Engineering, Xi’an University of Architecture &Technology, Xi’an 710055 ,China
Abstract：Steel-concrete vertical hybrid structure with diagonal bracing is a new structure system which is proposed in order to apply the direct air-cooled technology in high earthquake intensity areas, according to the type of platform, it can be divided into two types: steel truss-diagonal bracing structure and solid web girder-diagonal bracing structure. On the foundation of the seismic experiment of steel truss- diagonal bracing model structure, finite element software ABAQUS is used to calculate and analyze the base shear response, deformation properties and damage evolution characteristics of reinforced concrete pipe columns of two kinds structures with diagonal bracing. The results show that: the proposed simplification principles and finite element modeling methods are reasonable, calculated results agree well with the test results; under different earthquake intensities, the biggest base shear force and the shear-weight ratio of the steel truss-diagonal bracing structure are greater than the solid web girder-diagonal structure; the lateral displacement curves for two kinds of structures are both shifting from shear-moment-type toward shear-type as the earthquake intensity increase; the lateral displacement on and below the corbel of the steel truss-diagonal bracing structure is slightly greater than the solid web girder-diagonal structure, while above the corbel, it is just the opposite; the lateral displacement angel on the top of the column for the steel truss-diagonal bracing structure is slightly smaller than the solid web girder-diagonal structure; seismic performances of two kinds of structures are both good, which can meet the seismic acquirement of the large-capacity units in high earthquake intensity areas.
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