Study On Seismic Behavior And Damping Control Of Single Span Frame-bent Structures Of Large Thermal Power Plant Main Buildings

In order to reduce the volume of thermal power plant construction, layout mode from the conventional three column type previously(steam room- oxygen- coal bunker) scheme for the development of the two column type(steam room and deaeration coal-bunker bays) layout and form a structure of single span frame bent. Compared with the traditional layout structure, the new one’s height increases, and it reduces the cross frame. The staggered floor problem and the abnormal joint problem is greatly reduced. From this point of view it is relatively good. But in a certain extent, the reduction of a row of lateral resistant member make structures’ safety stock decreases. Affected by the Wenchuan earthquake and the defined requirements of using single span frame in multi-storey and high-rise structure put forward by the code for seismic design of buliding, so it must be careful when using single span RC frame structure in thermal power plant. Study on seismic behavior single span frame-bent RC structure of large thermal power plant main buildings has important theoretical significance and practical value.First of all, in order to solve the difficulties of tedious repetitive data extraction, storage and processing in the process of analysis, two secondary development program of SAP2000 and ABAQUS based on MATLAB is developed. By using SAP2000 and ABAQUS finite element software, the finite element structural analysis model of single span frame-bent RC structure of large thermal power plant main buildings are established and analysed. From the dynamic characteristics analysis, seismic response spectrum analysis and elasto-plastic time history analysis, the structural characteristics, deformation characteristics, failure mode and the weak layer of the structure are judged. According to the analysis results, the seismic performance of structures, which is improved by the traditional reinforcement scheme(increasing the column section size, scattered setting shear wall) and energy dissipation scheme(setting buckling restrained brace, the coal scuttle vibration, setting beam damper), are researched by elasto-plastic time history analysis under major earthquake.Based on the analysis results, we can get the characteristics of this kind of structure: uneven distribution of mass and stiffness lead the larger effect of torsion; the coal scuttle floor, which has quality outstanding and small stiffness, and the bottom floor, whose columns have high axial compression ratio, are the weak layer of the structure in the elastic-plastic stage; The traditional reinforcement scheme can reduce the damage of the structure damage, but enhance the seismic force of the structure; the passive energy dissipation technology, clever use of the main workshop space and layout, improve the seismic performance of the structure; the research results of this paper can give some reference for the application of the single span frame-bent RC structure in thermal power plant main buildings and improvement of its aseismic performance.