【作者】 杨敏；

【导师】 蔡健； 吴结韦；

【作者基本信息】 华南理工大学 ， 工程硕士（专业学位）， 2018， 硕士

【摘要】 随着改革开放的不断深入和经济的飞速发展,人们对建筑的平面布置提出了更高的要求:在会议会展、歌剧院、电影院、交通枢纽等公共建筑中出现越来越多的大跨度楼盖结构。而大跨度楼盖结构选型的合理与否,直接影响到结构的受力性能和造价,甚至影响到结构的正常使用和安全。因此,研究大跨度楼盖结构选型具有重要的现实意义。国内对于20~30m范围的大跨度楼盖选型研究还较少,且楼盖选型研究很少涉及抗震性能评估及楼板舒适度分析。在前人研究的基础上,本文对海南某国际会议中心29m×36m多功能会议厅大跨度楼盖选型进行研究,对比分析了普通混凝土梁、预应力混凝土梁、型钢混凝土梁、带腋撑混凝土梁四种大跨度楼盖方案:(1)根据我国现行设计规范对四种方案进行结构设计及内力分析并进行对比分析;验算大跨度梁挠度与裂缝;统计四种方案主要材料用量,进行经济性对比、施工难易度对比。(2)采用静力弹塑性推覆(Pushover)方法评估及对比四种方案的抗震性能。(3)根据国内外研究现状,选取合适方法对四种楼盖方案进行楼板舒适度分析及评价。通过以上研究主要得出以下结论:(1)大跨度框架内力主要由恒载控制,减少其自重对减少材料用量最为有效;四种方案对比带腋撑混凝土梁方案的框架梁受力最为合理,腋撑的设置可显著减少大跨度梁的支座负弯矩及跨中弯矩,但同时也对框架柱增加了较大的附加剪力。(2)大跨度梁截面配筋往往由挠度、裂缝控制,由此设计出来的大跨度梁极限抗震承载力往往大于框架柱。(3)在罕遇地震作用下,带腋撑混凝土梁方案腋撑先破坏,然后才是梁柱破坏,相当于多了一道防线,比另外三种方案具有更好的抗倒塌能力。(4)楼板舒适度在大跨度结构设计时需引起重视,应根据具体使用要求对楼板舒适度进行针对性分析。更多还原

【Abstract】 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.更多还原