The Study Of The Floor Structure Selection Of A Large-span International Conference Center

With the further process of reform and opening up and rapid economic development,people have come up with higher requirements for architectural planning.An increasing number of large-span structures were applied in public buildings such as conference and exhibition halls,opera houses,movie theaters,and transportation hubs.The selection of large-span floor structure system will directly affect the mechanical performance,the cost,even the normal use,and the safety of the structure.Therefore,it is of great practical significance to study the selection of large span floor structures.So far there has been little research on the selection of large-span floor structures in the range of 20~30 meters,and the existing research lack of involving the seismic performance evaluation and the analysis of vibration comfort.So far there has been little research on the selection of large-span floor structures in the range of 20×30 meters,and the evaluation of seismic performance and vibration comfort were lacked in the current research.In this paper,based on previous research,the efficiency of four kinds of large-span floor structure systems(RC-beam,PC-beam,SRC-beam,and RC-beam with haunch braces)of an existing 29 m x 36 m multifunctional conference hall,in Hainan,are investigated and compared.(1)Structural design and internal forces analysis were applied to those four schemes according to the current design code.The deflection and crack,the material consumption,the economic efficiency,and the construction difficulty were compared.(2)Static pushover method was used to evaluate and compare the seismic performance of the four schemes.(3)Suitable methods were selected to analyze and evaluate the floor vibration comfort degree of the four floor plans based on the research status at home and abroad.The conclusions were drawn from the above work.(1)Reducing deadweight is the most effective way to decrease material dosage because the internal force of the large-span structure is mainly controlled by dead load.The setting of the haunch braces can significantly reduce the negative bending moment and the middle moment of the span of the large span beam,also it could increase the additional shear force to the frame column at the same time.For this reason,the RC-beam with haunch braces is the most reasonable out of the four schemes.(2)The ultimate seismic bearing capacity of the large-span beam is greater than the column since the sectional reinforcement of beams was controlled by deflection and crack.(3)An extra protection is provided by braces in the RC beam with haunch braces system,it makes the RC beam with haunch braces system more resistant to collapse than the other three schemes,since the haunch braces will be broken before the RC beam is damaged under rare earthquake.(4)More attention should be paid to floor vibration comfort when designing large-span structures and specific investigation should be carried out according to specific requirements.