（广州市城市规划勘测设计研究院，510060）
［提要］广州珠江帝景会所游泳池圆形屋顶直径达34m，经过多方案比较，最后采用预应力混凝土梁体系。预应力主梁星形布置，每根内环柱支承斜向交叉的两根主梁，次梁环向布置。计算采用空间杆系模型，梁柱节点为刚接。结算结果表明，屋盖预应力大梁的挠度、裂缝宽度和控制截面的承载力均满足规范的要求。预应力筋的布置高度上下错开，避免了预应力相交的问题。工程的经验可以供类似工程参数。
［关键词］星形梁；有粘结预应力；裂缝宽度；承载力；挠度
Prestressed Concrete Beam Design of Swimming Pool Circular Roof in Guangzhou Riverside Regal Hotel/Liu Yongtian(Guangzhou Urban Planning & Design Survey Research Institute,Guangzhou 510060,China)
Abstract:The diameter of circle roof in swimming pool of Guangzhou Riverside Regal Hotel is 34m.The prestressed concrete beam system is adopted after comparison of serveral schemes.The prestressed concrete beams are distributed starshaped,and every inner circle column supports two main beams obliqueangled crossing.The secondary beams distribute circularly.The pole system model is used in calculation,and the joint of the beam to column is rigidity.The calculation results show that the deflection,crack width and bearing capacity of the control section satisfy the requirement of the code.The prestressed reinforcements are not at the same height to avoid the intersection of them.
Keywords:starshaped beam; bonded prestress; crack width; bearing capacity; deflection