（中国建筑西北设计研究院，西安710003）

［提要］延安体育场东看台与健身广场采用后张有粘结预应力混凝土框架结构，健身广场第一跨为275m预应力混凝土转换梁，东看台采用2728m预应力混凝土框架梁，使跨河跨路工程解决了市区排洪与交通问题。对梁端负弯矩较大的部位采取竖向加腋或水平加腋，有效地解决了露天结构中构件不出现裂缝的设计要求。对东看台中间支座梁端负弯矩较大部位，采用一端在梁内固定，另一端在第二跨梁底或梁侧张拉的抛物线布筋方式，避免了因连续布筋过多造成预应力偏心弯矩过大而引起的边柱或悬臂梁受力不合理的现象。给出了结构的特点和节点构造，以及预应力转换梁施工阶段验算结果及预应力筋分段分批张拉的施工顺序。

［关键词］预应力混凝土框架；转换梁；预应力次弯矩；施工验算；张拉顺序

Design of Great Span Prestressed Reinforced Concrete Frame in Yan"an Stadium/Tian Min，Wang Ruiru（China Northwest Building Design Research Institute, Xi"an 710003，China）

Abstract:The bonded post-stressed concrete frame is used in the stand and playground of Yan"an StadiumThe first post-stressed concrete transfer beam of the playground is 27.5m, and the post-stressed concrete beam of the east stand is 27.28m. Horizontal and vertical haunch is used. The beam negative moment is big.The parabolic cable, whose one end is anchored in beam and the other end is stretched at the beam bottom or side, is used in the place of the east stand beam whose negative moment is big in middle pedestal. Some characteristics of the design and constructional detail of the frame joint are introduced. The checking calculation of the post-stressed concrete transfer beam in the construction period and the stretching sequence of the deformed bar is also introduced.

Keywords:poststressed concrete frame；transferbeam；submoment；checking calculation；stretching sequence