Study On Structure Selection And Seismic Performance Of An Ultrahigh And Long-span Single-layer Factory

An ultrahigh and long-span industrial plant structures is complex, in order to ensure it to be safe, reliable, and select the appropriate type of structure, it is necessary to analysis the seismic performance. We will build an factory like this, and the net space will not less than260×100×100m(L×W×H), and the doors in the end walls will be not less than70×70m(W×H). Belongs to ultrahigh, large-span and open architecture, a reasonable selection of lower supporting structure and the roof structure will have a significant impact to it of the safety and economy. This paper is based on the building, do a series of work for the selection of structural and seismic performance of the building: The selection of structural lateral force resisting system, given the recommended program, do the seismic analysis of structures in the earthquake and rare earthquake. The following achievements have been gotten:Firstly, in accordance with the principles of ultra large cross-storey factory structure selection, comparing the means and ways in conceptual design, an instance of an analog system optimization method, prepared12structural alternatives of7kinds, and analysis them at same height, same span, same load and operating conditions. And compared structural deformation, internal forces, material consumption, as well as construction difficulties. At last, come to concrete filled steel tubular framework-support-concrete cylinder hybrid structure for the better program.Secondly, analysis of the elastic structure in a history way, the results show that: the structural response as a whole is more than the modal response spectrum method, which indicates that the use of modal response spectrum method to calculate the design is relatively unsafe, time history analysis method should be used to check the result. From the three group of seismic wave time history analysis results, displace of X-direction is similar to, displace of Y-direction is less than the modal response spectrum method, but the most drift angles of both X-direction and Y-direction are greater than the response spectrum method result. The average of most drift angle of Y-direction is slightly less than the specification limits. Structural displacement within a reasonable range, indicating that the structure of the project to meet the "minor earthquake" performance requirements. Thirdly, test the seismic performance of the model under rare earthquakes by the elastic-plastic dynamic time-history analysis method:the deformation of the structure of the plastic drift angle is able to meet the specification requirements. At the same time, the development of structure in the rare earthquake is still capable of carrying capacity of plastic hinge in the rod end at the dissipation of energy in a reasonable manner; part of the concrete cylinder at the bottom of the shear wall appears level cracking, but the concrete filled steel tubular column does not appear to plastic hinge structure to meet the requirements of the earthquake inverted.