结合设计中跨度较大、重荷载、耐久稳定、防腐、防火要求高等特点,对某会展馆楼面结构优化后,选取后张有黏结预应力混凝土结构,使结构具有较好的整体受力性能.从分析模型确立、裂缝控制、承载力验算3个宏观方向,详细阐述后张有黏结预应力框架设计中的预应力估算、线形确定、损失估算、次弯矩影响、非预应力筋计算、控制截面讨论等全过程,针对能够反映混凝土框架梁端延性的受压区高度、折算受拉钢筋配筋率、预应力度、非预应力钢筋面积比等几个问题,给出在设计过程中的处理办法及延性目标限值,最后确定合理的张拉施工方案,并对张拉核心区进行验算,达到设计施工的和谐统一,可供类似工程参考.

Combined with the large span, heavy load, stability, durability, and high requirement for fire prevention and anti-corrosion, the optimized structure should be a post-tensioned bonded prestressed concrete frame structure, and the overall structure has good mechanical properties. Starting from three macro directions of analysis model establishment, the crack control, and bearing capacity calculation, the detail design process for long-span posted-tensioned bonded prestressed beams is introduced. Some problems, such as degree of the relative height of equivalent compression zone, partial presstressing ratio, rate of tension reinforcing steel bar, and non-prestressed reinforcement area ratio, are discussed and the treatments are put forward. As indicating in the results, for developing a reasonable tension construction scheme, some construction measures for the core areas of tension are suggested, and the design experience could be referred to similar engineering projects.