Study On Seismic Performance Analysis Of The Long-Span Structure For Coal-Conveyer Gallery

Power structure is the life-keeper engineering, coal-conveyer gallery is an important part of thermal power plant. It connects the transfer station and main building, and plays an important role in the fuel supply channel. It should have a great performance for seismic. Due to the limit of plant technology, gallery`s span is increasing, cause the mass, stiffness, uneveness distributing along the vertical, also more weakness points, less defense line for earthquake, including low security reserves. Currently there is less study for the long-span gallery on the seismic performance. Therefore, in order to avoid the galley break down in earthquakes and ensure it can be operated after earthquakes, it is necessary to thoroughly understand the long-span gallery`s seismic performance. Study on seismic performance and guide to engineering design have important significance for long-span coal-conveyer gallery.In this paper, a model is represented based on 4×40m, 3×50m and 3×60m span. Actural gallery projects has been established and analyzed by finite element method. Inorder to analysis method for long-span gallery and contrast the advantages and disadvantages between response spectrum analysis method and time-history. The dynamic properties,displacement, base reaction and the stress of the main components were used. Because of long span gallery's large size, ignoring the effects of seismic wave passage, causing the structure unsafe. Establishing 10×60m span finite element model, and analyzing structure`s influence between the traveling wave effect and uniform seismic excitation.(1) Investigating and studying in design institute and power plant, and widely collecting the damestic and foreign revlevant literature. Understanding the long-span gallery form and characteristics, and finding out the problems of existing structure on the seisimic face.(2) Introducing the gallery structure design method, and establishing 4×40m, 3×50m and 3×60m span gallery finite element model. Getting the structure dynamic characteristics and cycle, stress, deformation through model analysis and seismic response spectrum method. The results show that gallery`s earthquake response under vertical seismic by response spectrum analysis were smaller, time history analysis is recommended to supplement calculated.(3) 4×40m, 3×50m and 3×60m span gallery model has been analysised by dynamic time-history methed under seismic excitation. Getting the structure deformation, base reaction and stress. The results show that gallery`s earthquake response under vertical seismic by time-history analysis is close to the code.(4) Inelastic modal have been established and analysised for the long-span gallery by time-history methed under strong earthquake. Resulting deformation, bearing capacity and weak parts of the structure. Weak parts are frame column, beam and chord.(5) Establishing large-span long-distances gallery model. Under two methods, earthquake simulates on the model which the seismic wave passage effect has been considered or not, it was calculated with different wave velocity when considering the seismic wave passage effect. The results showed that structural response under uniform excitation is greater than wave passage effect excitation.Finally, according to research contents of the whole dissertation, combined with domestic and international engineering practice and suited the actual situation in china, a reasonable method for seismic calculating method of the long-span coal-conveyer gallery are presented.