Analysis On Seismic Capability Of Turbine House+Deaerator Bay Single Span Frame Of Main Power Building

In power plant area, the common structure of main power building is turbine house+ deaerator bay+ mill and coal bunker bay, which called tradition three column type frame and bent. By changing of the process layout, there are varied types of main power building, as turbine house+ deaerator and mill bay single span frame, and turbine house+ deaerator bay single span frame(mill bay is a separate arrangement). The two types of frame are called single span frame in electric power industry.In section 6.1.5 in new version of Code for seismic design of buildings(GB 50011-2010), For buildings assigned to Fortification Category A or B, and Fortification Category C that the building height is more than 24 m, the single span frame is forbidden. For buildings assigned to Fortification Category C that the building height is not more than 24 m, the single span frame is not shall be considered. The height of main power building is more than 24 m, and is assigned to Fortification Category B, single span frame will be forbidden by applying the requirement new version.In power plant area, under the operation floor of single span frame, large platform frame is connected with deaerator bay, which formed multi span actually. But the frame is still single span frame above operation floor although there is constraint from roof beam in turbine house. And the building height is more than 24 m, the frame also have some characteristics of single span frame. In other words, the single span frame in power plant is different from the absolute single span frame in civil construction, but it have a part of same characteristic of that in civil construction. The difference of basic seismic performance between single span frame and tradition three column type frame and bent, and how much stiffness contribution can be provided by large platform, is required to be cleared. Therefore, there is important practical significance in research of basic seismic performance in single span frame.The research in this paper is only for turbine house+ deaerator bay single span frame. By Elastic analysis and Dynamic time history analysis on the model of 600 MW large-size turbine house+ deaerator bay single span frame(mill bay is a separate arrangement), we get the conclusion that the single span frame In power plant is not the absolute single span frame, but showing the combined system by frame and bent. And the stiffness contribution provided by large platform for frame is cleared. At the same time, it provided effective reference data for the design of similar project.