| Suspended structures are favoured by architects and structural engineers for their comprehensive advantages such as good architectural adaptability,clear force transmission path and potentially efficient structural performance,and has been used in many iconic high-rise buildings at home and abroad.With the rapid development of prefabricated buildings in China in full swing,how to apply high-strength steel to build a new type of prefabricated high-rise suspended steel structure system and promote its application in demonstration projects,this paper relies on the funding of the National Natural Science Foundation of China project(51578357)to carry out theoretical analysis and experimental research on its key technical issues,and the main research findings are as follows.(1)On the basis of literature review and research,the progress of domestic and international research on existing structural systems for suspended buildings,their strengths and weaknesses and their scope of application are reviewed.(2)A new type of fully assembled high-rise steel frame suspension structural system is proposed.The main features and innovations of the system are: 1)the first application of Q390 steel;2)some of the steel columns change from the traditional compression-bending state to tension-bending state due to suspension,and the design of the members change from stability control to strength control,which greatly saves steel;3)all suspension lifting points are made of high-strength bolts and no welding seams,achieving 100% full assembly.(3)With the help of the general structure analysis software MIDAS,the systematic structural design and theoretical analysis of the new structural system were carried out,and it was applied to a demonstration project in Taiyuan.The safety and economy of the system,especially the good seismic performance and comprehensive advantages are verified.(4)Aiming at the M39 high-strength bolts used in the suspension lifting point in the new suspension structure system,the fatigue performance test study was carried out by MTS Lankmark370.50 fatigue test machine.The fatigue curve(S-N curve)was obtained,and its constant amplitude fatigue design method was established to avoid the hidden danger of fatigue damage.On this basis,the stress amplitude and number of cycles of the high-strength bolts at each suspension point connection under wind load were obtained by combining the measured wind speed data set from the Meteorological Data Centre of the China Meteorological Administration,and the fatigue test was carried out on the high-strength bolts at the most dangerous suspension points.. |
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