某大型公共建筑采光顶支承结构体系分析

玻璃采光顶具有丰富建筑造型、提高自然采光、节约能源等优点,其在大型公共建筑中具有广泛的应用空间.结合工程实际,在讨论玻璃采光顶特点的基础上,着重分析不同杆件分别采用不同截面时,对整体结构的受力和刚度的影响.通过对不同结构体系模型进行模态响应对比分析,进一步强调结构杆件截面的选择对整体结构受力影响的重要性,为实际工程中类似采光顶支承结构体系的优化设计提供参考方法,从而达到结构受力合理,刚度适中,经济可行的目的.分析结果表明：环梁、立柱及主拱梁的截面选取极大影响整体结构的受力和刚度,并且也影响采光顶的通透性;次梁、支撑截面尺寸虽对整体结构受力、刚度影响不大,但须满足经济性要求.

ANALYSIS OF SUPPORTING STRUCTURE SYSTEM OF DAYLIGHTING TOP FOR A LARGE PUBLIC BUILDING

Glass daylighting top has the advantages of riching architectural modeling and improving the natural lighting, which has a very big application space in large public buildings. Combined with actual projects, on the basis of the discussion of the characteristics of glass daylighting top, it was emphatically analyzed the impact of using respectively different section on the stress and stiffness of whole structure. Based on modal response analysis of different structure system models, it was further emphasised the importance of the impact of structure bar cross section on the overall structure, thus providing the optimization design method to follow in actual projects, so as to achieve the purpose of uniform stress, moderate stiffness and feasible economy. The analysis results show that the cross section selection of ring beam and girder has a great effect on whether the overall structure has uniform stress, moderate stiffness and feasible economy, and also affects the permeability of daylighting top; the affection of the sections of secondary beam and brace on the stress and stiffness of overall structure is small, but they must meet the economy requirements.