Study On Seismic Text Of Steel Frame-Bent With Abnormal Joints Of Large-Scale Thermal Power Plant

With the commissioning of the1000MW, the main buildings in large--scale thermal power plants are more complex, and the requirement for the buildings are more and more strict. So investigate on seismic behavior of this kind of structures is of importance on practical and theoretical values.For the study of seismic performance of the steel frame-bent main building containing irregular joints which come into being due to stress and technology requirements, This paper selected a steel frame-bent structure that include turbine hall、deaerator and coalbunker bay from the main building of the1000MW, we made a model of the steel frame-bent structure in scale ratio of1:10, and then pseudo-dynamic test was conducted under7different earthquake waves. Obtained the displacement time histories、acceleration time histories、deformation performance、 energy dissipation capacity and acceleration amplification factor of the model structure. The results of the pseudo-dynamic test showed that:the steel frame-bent structure have better seismic behavior. At the peak acceleration of910gal(equivalent to rare earthquake of9intensity), the steel frame-bent structure still remain well entirety, and has produced a certain plastic deformation, the structure will come into the elastic-plastic phase. But the structure does not appear to damage phenomena, deformation less than the specification limits. It shows that the structure can withstand the9degrees of severe earthquakes, and to meet the design requirements of "no collapsing with strong earthquake".The pseudo-static test was be made after the pseudo-dynamic test. Following the test that we obtained the appearance sequence of the plastic hinge of the model, and it shows that the steel frame-bent structure which the stiffness is not uniform and includes the abnormal joints exist obvious weak story. The steel frame-bent structure is a strong beam and weak column frame structure for the abnormal joints. So the column yield and the beam not that brings disadvantageous effects on seismic behavior of frame structure. And we have best to make the stiffness uniform and to strengthen the weak story. Then analysis the skeleton curve of the frame structure, and give out the maximal bearing capacity and analysis the main influencing factors of bearing capacity.This study reveals the seismic performance of the main plant of the large thermal power plants and the yield failure mode, and have a comprehensive understanding of the structure under the earthquake response, to guide future design of the class structure to provide a reference.