【摘要】 以碳云大厦项目体型复杂的办公楼大跨楼盖为研究对象，重点探讨后张缓粘结预应力平板设计的核心问题。研究内容涵盖楼盖体系方案比选、预应力筋布置与设计参数确定、基于整体计算模型考虑预应力和施工模拟影响的分桩方法、预应力对相邻结构影响及预应力筋线形的改进。通过SAP2000软件建立包含预应力筋单元的整体计算模型，进行考虑预应力筋张拉与塔楼施工结合的全过程施工模拟分析，运用是否考虑预应力筋作用的双计算模型包络设计预应力楼盖及其他构件的承载力，并改进预应力筋线形降低外框梁跨中相连楼盖受力。结果表明：周边大跨框架梁+后张缓粘结预应力平板体系满足净高与整体结构抗侧要求，改进预应力筋线形使外框梁跨中楼板正弯矩减小40%以上；预应力使楼盖竖向位移减小约20%、弯矩减小30%～40%,并对相邻3层柱及本层梁产生附加内力；双计算模型包络设计保障了结构安全。更多还原

【Abstract】 Taking the large-span floor of the geometrically complex office building in Icarbonx project as the research object, key issues in the design of post-tensioned retard-bonded prestressed flat slab were focused on. The research covers scheme comparison and selection for the floor system, prestressing tendon layout and determination of design parameters, the method of pile separation considering the influence of prestress and construction simulation based on the overall calculation model, the prestressing impact on adjacent structures and improvements to tendon profiles. A global computational model incorporating prestressing tendon elements was established using SAP2000 software. A full-process construction simulation analysis was conducted, integrating the prestressing tendon tensioning sequence with tower construction stages. An envelope design approach using dual computational models considering or not considering the effect of prestressed tendons was employed to determine the load-bearing capacity of the prestressed floor and other members. Furthermore, the prestressing tendon profile was optimized to reduce forces in the floor slabs connected to the mid-span of the perimeter large-span frame beams. The results show that the system of surrounding large-span frame beams + post-tensioned retard-bonded prestressed flat slab meets the requirements of clear height and overall structural lateral resistance, improved tendon profile reduces the positive bending moment of the floor slab at the mid-span of the outer frame beam by over 40%.Prestress reduces the vertical displacement of the floor slab by about 20% and the bending moment by 30%～40%, and generates additional internal forces on the adjacent 3-story columns and the current-story beams. The dual computational model envelope design ensures structural safety.更多还原